Replaceable and irreplaceable food components. Six main components of nutrition

We have already studied the third article, which are essential for human nutrition - essential substances of products for health.

and products for Human health.

Amino acids - these are just proteins, figuratively speaking, the "building material" of the cells of the human body.

Each amino acid, in human digestion, has its own specific unique site of action in the breakdown of food and influencing both the internal systems of the body and the human body as a whole.
Taurine amino acid - reduces any edema, of various origins.

Taurine also regulates the balance between potassium and sodium. Taurine has a beneficial effect, one might even say it has a beneficial effect on the work of the heart muscle.
Essential amino acids and their protein component of a correct balanced diet
human - are extremely important for health.
With the development of a disease in the human body or any pathological development in the human body, in order to restore the normal state, its own specific amino acid is required for each case and disease.

Modern medicine very clearly and specifically recommends various options for this phenomenon.

the thing is far from permanent!

For its maintenance and preservation, the human body needs to receive a full-fledged balanced protein diet.
First of all - proteins of food of animal origin

and products for Human health.

Vegetarians - an unusual phenomenon for a person, contrary to nature. By nature, man is omnivorous.
So, vegetarians should know that vegetarian food cannot be complete for a person.
We, like predators, have fangs, we also have teeth, like those of herbivores.
The human body needs "fatty" acids, including irreplaceable ones. Let me remind you that these are those that are not synthesized in the human body.
Up to 19 for centuries, people have consumed a lot of them with food.

Let me remind you that the food was completely different then!

Therefore, there was no point in synthesis.
Fats should not be only vegetable, everything should be in moderation.
P.S. Remember! About Relationships and Balance!
Approximately one third of the fat should be of animal origin.

Salo Is a traditional classic example of refractory fats. In past centuries, humanity has eaten it - a colossal amount.
The need for fatty acids sometimes rises sharply. Most often this occurs with diseases or mechanical injuries.

In trauma, fatty acids promote skin regeneration and wound healing.
The need for fatty acids can arise unexpectedly, explosively.
In modern life, when food products can no longer provide the human body with everything necessary, it is most convenient to get everything you need from natural biologically active functional food products.

It is very important to have the right balanced diet every day!

Among vegetable fats, olive and flaxseed oil is the most complete, followed by soybean oil and, with a great lag, our traditional oil is sunflower oil.
It is also necessary to know about Fiber and plant fibers as indispensable substances in human nutrition and take this into account in proper nutrition ... ..

Do not forget! And Remember! and Balance! and About Relationships!

Additionally, study the material here:

Research on the problems of Life and Nutrition will continue!

Section 11.1

The concept of a complete diet.

11.1.1. Full-fledged is called a diet that meets the energy needs of a person and contains the necessary amount of essential nutrients that ensure the normal growth and development of the body.

Factors affecting the body's need for energy and nutrients: gender, age and body weight of a person, his physical activity, climatic conditions, biochemical, immunological and morphological characteristics of the organism.

All nutrients can be divided into five classes:

1. proteins; 2.fats; 3. carbohydrates; 4. vitamins; 5. minerals.

In addition, any diet should contain water as a universal solvent.

The indispensable components of the diet are:

  1. essential amino acids - valine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan;
  2. irreplaceable (essential) fatty acids - linoleic, linolenic, arachidonic;
  3. water and fat-soluble vitamins;
  4. inorganic (mineral) elements - calcium, potassium, sodium, chlorine, copper, iron, chromium, fluorine, iodine and others.

11.1.2. Balanced diet. A diet containing nutrients in a ratio optimal for maximum satisfaction of the plastic and energy needs of the human body is called a balanced diet. It is believed that the most favorable ratio of proteins, fats and carbohydrates is close to 1: 1: 4, provided that the total caloric content of the diet corresponds to the energy consumption of a given person. So, for a young student weighing 60 kg, energy consumption is on average 2900 kcal per day and the diet should contain: 80-100 g of proteins, 90 g of fat, 300 - 400 g of carbohydrates.

Section 11.2 Characterization of food proteins.

11.2.1. The biological role of dietary proteins is that they serve as a source of irreplaceable and replaceable amino acids. Amino acids are used by the body to synthesize its own proteins; as precursors of non-protein nitrogenous substances (hormones, purines, porphyrins, etc.); as a source of energy (oxidation of 1 g of proteins gives about 4 kcal of energy).

Dietary proteins are divided into complete and deficient.

Complete dietary proteins - of animal origin, contain all amino acids in the required proportions and are well absorbed by the body.

Defective proteins - of vegetable origin, do not contain, or contain insufficient amounts of one or more essential amino acids. So, grain crops are deficient in lysine, methionine, threonine; potato protein contains little methionine and cysteine. To obtain high-protein diets, plant proteins that complement each other in amino acid composition, for example, corn and beans, should be combined.

Daily need: not less than 50 g per day, on average 80-100 g.

11.2.2. Protein deficiency in childhood causes: 1. a decrease in the body's resistance to infections; 2. growth arrest due to impaired synthesis of growth factors; 3. energy deficiency of the body (depletion of carbohydrate and fat stores, catabolism of tissue proteins); 4. loss of body weight - hypotrophy. With protein starvation, edema is observed, which occurs due to a decrease in the content of proteins in the blood ( hypoalbuminemia) and violations of the distribution of water between blood and tissues.

Section 11.3 Characteristics of edible fats.

11.3.1. The composition of dietary fats consists mainly of triacylglycerols (98%), phospholipids and cholesterol. Triacylglycerols of animal origin are high in saturated fatty acids and have a firm consistency. Vegetable fats contain more unsaturated fatty acids and have a liquid consistency (oils).

Biological role: 1. are one of the main sources of energy; 2. serve as a source of essential polyunsaturated fatty acids; 3. Promote the absorption of fat-soluble vitamins from the intestines. Polyunsaturated fatty acids are necessary for the body to build phospholipids, which form the basis of all cell membrane structures and blood lipoproteins. In addition, linoleic acid is used for the synthesis of arachidonic acid, which serves as a precursor of prostaglandins, prostacyclins, thromboxanes and leukotrienes.

Daily requirement: 90-100 g, of which 30% should be vegetable oils. The nutritional value of vegetable fats is higher than that of animals, since with an equal energy effect - 9 kcal per 1 g, they contain more essential fatty acids.

11.3.2. Violation of the ratio of the proportion of vegetable and animal fats in the diet leads to a change in the ratio in the blood of different classes of lipoproteins and, as a consequence, to coronary heart disease and atherosclerosis.

Section 11.4

Characteristics of food carbohydrates.

11.4.1. Dietary carbohydrates, according to their ability to be absorbed by the human body, are divided into two groups:

    assimilable: glucose, fructose, sucrose, lactose, starch;

    indigestible: cellulose (fiber), hemicellulose, pectins.

The biological role of digestible carbohydrates: 1. are the main source of energy for humans (oxidation of 1 g gives 4 kcal); 2. serve as precursors in the synthesis of many biomolecules - heteropolysaccharides, glycolipids, nucleic acids.

The biological role of indigestible carbohydrates: fiber affects intestinal motility, promotes the elimination of cholesterol, prevents the development of obesity and gallstone disease.

Daily requirement: 300-400 g, of which - easily digestible carbohydrates (fructose, sucrose, lactose) - 50-100 g, fiber 25 g, the rest is starch.

11.4.2. An excess of easily digestible carbohydrates in the diet contributes to the development of diseases such as obesity, diabetes, dental caries. Lack of fiber (fiber) contributes to the development of colon cancer.

Section 11.5

Vitamins.

11.5.1. Vitamins - low-molecular organic compounds that enter the body with food and ensure the normal course of biochemical and physiological processes. Vitamins are not incorporated into tissue structure and are not used as an energy source.

11.5.2. Classification of vitamins. Vitamins are divided into two groups: water-soluble vitamins and fat-soluble vitamins. Water-soluble vitamins- B1, B2, B6, B12, PP, H, C, folic acid, pantothenic acid. Fat-soluble vitamins - A, D, E, K.

For each vitamin, in addition to the letter designation, there is a chemical and physiological name. Physiological name usually consists of the prefix anti- and the names of the disease, the development of which is prevented by the vitamin (for example, vitamin H - antiseborrhoeic).

11.5.3. Provitamins. Some vitamins can be synthesized directly in the human body. Compounds that serve as precursors for the synthesis of vitamins in the cells of the human body are called provitamins... For example, the provitamin of vitamin A is carotene, vitamin D2 is ergosterol, and D3 is 7-dehydrocholesterol.

11.5.4. The biological role of vitamins. Vitamins entering the body are converted into their active form, which is directly involved in biochemical processes. The biological role of water-soluble vitamins is that they are part of coenzymes involved in the metabolism of proteins, fats and carbohydrates in the cells of the human body.

Table 1 lists examples of vitamins and their biological role.

Table 1.

Coenzyme functions of water-soluble vitamins.

VitaminCoenzymeType of reaction catalyzed
B1 - thiamine Thiamine diphosphate (TDF) Oxidative decarboxylation of α-keto acids
B2 - riboflavin Flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD)
B3 - pantothenic acid Coenzyme A (HS-CoA) Transfer of acyl groups
B6 - pyridoxine Pyridoxal Phosphate (PF) Transamination and decarboxylation of amino acids
B9 - folic acid Tetrahydrofolic acid (THFA) Transfer of one-carbon groups
B12 - cyanocobalamin Methylcobalamin and deoxyadenosylcobalamin Transmethylation
PP - nicotinamide Nicotinamide adenine dinucleotide (phosphate) - NAD + and NADP + Redox

11.5.5. Antivitamins. The term antivitamins denote any substances that cause a decrease or complete loss of the biological activity of vitamins. According to their mechanism of action, they are divided into two groups: 1. antivitamins, which have a structure similar to that of a vitamin and compete with it for inclusion in a coenzyme; 2. Antivitamins, which cause chemical modification of the vitamin.

Examples are: thiaminase (antivitamin B1), akriquine (antivitamin B2), isoniazid (antivitamin PP), dicumarol (antivitamin K).

11.5.6. Diseases of inappropriate consumption of vitamins. To ensure the normal course of biochemical processes, a certain level of concentration of vitamins must be maintained in the human body. When this level changes, diseases develop with symptoms characteristic of each vitamin.

Hypervitaminosis - diseases, caused by an excess of vitamins in the body. Typical for fat-soluble vitamins that can accumulate in liver cells. Most often, there are hypervitaminosis A and D associated with an overdose of their drugs. Hypervitaminosis A is characterized by general symptoms of poisoning: severe headaches, nausea, weakness. Hypervitaminosis D is accompanied by bone demineralization, calcification of soft tissues, and the formation of kidney stones.

Hypovitaminosis - diseases caused by a lack of vitamins in the body. Primary hypovitaminosis associated with a violation of the processes of intake of vitamins into the body at: 1. lack of vitamins in food; 2. accelerated breakdown of vitamins in the intestine under the influence of pathogenic microflora; 3. Violation of the synthesis of vitamins by the intestinal microflora in case of dysbiosis; 4. impaired absorption of vitamins; 5. taking medications - antivitamins. Secondary hypovitaminosis associated with a violation of the processes of transformation of vitamins into their active forms in the cells of the human body. The reason may be genetic defects or disorders of biochemical processes in various diseases of organs and tissues.

Vitamin deficiency - diseases caused by a complete lack of vitamin in the body.

Section 11.5.5

The structure and biological functions of fat-soluble vitamins.

Vitamin A - retinol.

Active form: cis retinal.
Biological role:
1.controls the growth and differentiation of rapidly proliferating tissues (embryonic, cartilaginous, bone, epithelial); 2. participates in the photochemical act of vision.
Daily requirement:
0.5-2.0 mg.
Main food sources:
butter, animal and fish liver, b-carotene in red fruits.

Participation of vitamin A in the mechanism of twilight vision. In the process of light perception, the main role belongs to the pigment rhodopsin- a complex protein made up of protein opsin and prosthetic group - cis retinal... Under the influence of light, cis-retinal light is converted into an isomer - trans-retinal, which leads to the destruction of the rhodopsin pigment and the appearance of a nerve impulse. The pigment is restored according to the following scheme:

The process of isomerization of trans-retinol in the retina is very slow. Its main amount enters the bloodstream, then to the liver, where there is a rapid conversion of trans-retinol into cis-retinol, which enters the bloodstream and is absorbed by the retina. The process is limited by the supply of trans-retinol (vitamin A) in the liver.

Hypovitaminosis: violation of dark adaptation of vision (night blindness) in adults; in children - growth arrest, keratinization of the epithelium of all organs - hyperkeratosis, dryness of the cornea of ​​the eye - xerophthalmia, softening of the cornea under the influence of microflora - keratomalacia.

VitaminD3 - cholecalciferol.

Active form: 1,25-dihydroxycholecalciferol, calcitriol.
Biological role:
1.regulation of absorption of calcium and phosphate ions in the intestine; 2. reabsorption of calcium ions in the renal tubules; 3. mobilization of calcium ions from bones.
Daily requirement:
10-15 mcg (500-1000 IU).
Main food sources:
liver of animals and fish, eggs, milk, butter.

Synthesis of vitamin D3 and its active forms in human tissues. The precursor (provitamin) of vitamin D3 in the human body is 7-dehydrocholesterol, which, when acting on the skin ultraviolet radiation, passes into cholecalciferol.


Formation of the active form of the vitamin happens sequentially in the liver and kidneys by hydroxylation at 1 and 25 carbon atoms... The resulting 1,25-dihydroxycholecalciferol has hormonal activity (calcitriol). The target tissues for him are the intestines, kidneys, bones. In the intestinal epithelium and renal tubules, calcitriol induces the synthesis of Ca-binding protein, which promotes the absorption of Ca2 + ions from food and their reabsorption by the kidneys. In bone tissue, it inhibits collagen synthesis, reduces the Ca-binding capacity, which leads to the mobilization of calcium from the bones.

Hypovitaminosis: in children - rickets... Symptoms: 1. decreased muscle tone; 2. deformation of the bones of the skull, chest, spine, lower extremities. In adults - osteoporosis- demineralization of bones.
If the formation of active forms of vitamin D3 is impaired (for example, with damage to the liver and kidneys), a D-resistant rickets-like state develops.

Vitamin K -phylloquinone.

Active form: unknown.
Biological role
- participation in the synthesis of protein factors of blood coagulation: II (prothrombin), VII (proconvertin), IX (Christmas factor), and X (Prower-Stewart factor).
Daily requirement:
1 mg.
Main food sources:
synthesized by the intestinal microflora.
Hypovitaminosis
- parenchymal and capillary bleeding.

Vitamin E is tocopherol.

Active form: unknown.
Biological role
- natural antioxidant, inhibits lipid peroxidation of cell membranes.
Daily requirement:
5 mg.
Main food sources:
vegetable oils.
Hypovitaminosis
in a person - hemolytic anemia... In animals - muscular dystrophy, degeneration of the spinal cord, testicular atrophy, peroxide hemolysis of erythrocytes.

Section 11.5.6

The structure and biological functions of water-soluble vitamins.

Vitamin B 1 - thiamine.

Active form: coenzyme thiamine diphosphate (TDF).

Biological role: participates in the reactions of oxidative decarboxylation of pyruvate and α-ketoglutarate.

Daily requirement: 1-2 mg.

Main food sources: wholemeal flour, legumes, meat, fish.

Hypovitaminosis: disease Take it... Symptoms: 1. peripheral neuritis; 2. muscle weakness; 3. discoordination of movements; 4. an increase in the size of the heart; 5. an increase in the level of pyruvate in the blood. The main cause of death in patients with beriberi is heart failure.

Vitamin B 2 - riboflavin.

Active forms : coenzymes flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD).

Biological role: participates in redox reactions. For example: 1. transfer of electrons in the respiratory and monooxygenase chains; 2. oxidation of succinate; 3. oxidation of higher fatty acids.

Daily requirement: 1.5 - 3.0 mg.

Main food sources: milk, liver, meat, eggs, yellow vegetables.

Hypovitaminosis often occurs in pregnant women, children, people under stress. Symptoms: 1.inflammation of the papillae of the tongue - glossitis; 2.Crapped lips and corners of the mouth - angularstomatitis; 3. clouding of the lens - cataract; 4.inflammation of the cornea of ​​the eye - keratitis.

Vitamin B 6 - pyridoxine.

Active form: coenzyme pyridoxal phosphate.

Biological role: - participates in reactions: 1. transamination; 2. Decarboxylation of amino acids; 3. synthesis of nicotinamide from tryptophan; 4. synthesis of δ-aminolevulinic acid (heme synthesis).

Daily requirement: 2 mg.

Main food sources: bread, peas, beans, potatoes, meat.

Hypovitaminosis: vitamin deficiency does not cause specific symptoms.

Vitamin PP - nicotinamide (niacin).

Active form: coenzymes nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP).

Biological role: is a part of dehydrogenases. For example: 1. pyruvate dehydrogenase complex; 2. glucose-6-phosphate dehydrogenase; 3. glutamate dehydrogenase; 4. β-hydroxy, β-methylglutaryl-CoA reductase and many others.

Daily requirement: 15 - 20 mg.

Main food sources: meat, fish, peas, beans, nuts.

Hypovitaminosis: disease pellagra... Symptoms:

1.dermatitis- skin lesions; 2. diarrhea- damage to the mucous membrane of the gastrointestinal tract; 3. dementia- dementia. Since vitamin PP can be synthesized in the body from the amino acid tryptophan, pellagra can be treated by introducing additional amounts of complete animal proteins into the diet. 60 mg of tryptophan is equivalent to 1 mg of nicotinamide.

Vitamin B 9 - folic acid.


Active form:
coenzyme tetrahydrofolic acid.

Biological role: participates in the reactions of transfer of one-carbon groups during the synthesis of: 1. purine nucleotides; 2. thymidyl nucleotide; 3. methionine from homocysteine; 4. serine and glycine.

Daily requirement: 1 - 2.2 mg.

Main food sources: green leaves of plants, yeast.

Hypovitaminosis: macrocyticanemia.

Vitamin B12 - cyanocobalamin.

Active form: coenzymes methylcobalamin and deoxyadenosylcobalamin. They have a complex structure, in the center of which there is a cobalt atom (Co +) connected to four pyrrole rings forming corrinecore.

Biological role: participates in reactions: 1. transmethylation; 2. exchange of sulfur-containing amino acids; 3. formation of coenzyme forms of folic acid.

Daily requirement: 0.003 mg.

Main food sources: any animal products.

Hypovitaminosis : megaloblasticanemia which develops when the absorption of the vitamin in the intestine is impaired. For the absorption of vitamin B12 in the intestines, a special protein is needed gastromucoprotein(transcorrin), called - Castle intrinsic factor.

This protein is produced in the stomach, binds vitamin B12 (Castle's external factor) and the resulting complex is absorbed in the intestines. Any reasons leading to a disruption in the production of gastric glycoprotein (for example, organic lesions of the stomach, gastric resection) lead to vitamin B12 deficiency.

Vitamin C is ascorbic acid.


Active form - unknown.
Biological role
: cofactor for hydroxylation reactions. For example, in reactions of synthesis: 1. serotonin; 2. oxylysine and oxyproline in collagen; 3. homogentisic acid. In addition, it promotes the entry of iron into the blood from the intestines and its release from ferritin. It is an antioxidant.
Daily requirement:
50-100 mg.
Hypovitaminosis
- disease scurvy(grieving). Symptoms: 1. joint pain; 2.point hemorrhages - petechiae; 3. bleeding gums; 4. loosening of teeth; 5. anemia; 6. fast fatigability.

Vitamin H - biotin.

Active form: biocytin.

Biological role - participates in carboxylation reactions in the synthesis of: 1. purine nucleotides; 2. oxaloacetate; 3. malonil-CoA.

Daily requirement: 0.26 mg.

Main food sources: milk, egg yolk, liver, tomatoes, spinach.

Hypovitaminosis: since the vitamin is synthesized by the intestinal microflora, deficiency is rare. It manifests itself in the form of specific dermatitis of the scalp

Section 11.6

Mineral (inorganic) substances.

11.6.1. In addition to the six main elements - C, H, O, P, N, S, of which all organic molecules are composed, a person needs to receive about 20 more chemical elements. Depending on the amount in which they should enter the body, minerals are divided into: macronutrients- calcium, chlorine, magnesium, potassium, sodium - the daily requirement is more than 100 mg and trace elements- iron, manganese, copper, iodine, fluorine, molybdenum, selenium, zinc, etc. - daily requirement - several milligrams.

11.6.2. The biological role of minerals: 1. are structural components of tissues (calcium, fluorine); 2. provide water-salt balance (sodium, potassium); 3. are a prosthetic group of enzymes, are part of active centers, stabilize the structure of enzymes and enzyme-substrate complexes (magnesium, iron, copper); 4. participate in the transmission of nerve impulses (calcium); 5.participate in hormonal regulation of metabolism (iodine is part of hormones thyroid gland, zinc - in the composition of insulin).

11.6.3. A deficiency of trace elements in water and food can lead to the development of diseases. For example, a lack of iron and copper can cause anemia, a lack of fluoride contributes to the occurrence of caries, with a lack of iodine in food and water, endemic goiter develops.

Section 11.7

Chemical and biological food contaminants.

11.7.1. Chemical contaminants in food - products of human technological activity. They enter the body with plant foods, milk and meat of animals raised in ecologically unfavorable regions, as well as with canned foods prepared in violation of technology. Chemical pollutants include 1. radioactive isotopes; 2. heavy metal ions; 3. organic products of the chemical industry; 4. agricultural poisons; 5. food additives. Most chemical pollutants can build up in the human body and disrupt metabolism.

Heavy metal ions: mercury, lead, copper, tin, zinc, iron - interact with nitrogen atoms of nucleic acids and sulfur in proteins, causing disruption of the functioning of these macromolecules. In case of lead poisoning, increased fatigue, insomnia, and later disorders are noted. nervous system, brain damage. In children, the accumulation of lead in tissues causes a decrease in mental performance.

Nitrates enter the body with plant food and water, in the intestines are restored to nitrite which oxidize hemoglobin (Fe2 +) to methemoglobin (Fe3 +). When poisoning with nitrites, dyspnea, dizziness, cyanosis, methemoglobinemia... In addition, nitrites interact with amines (contained in products) to form nitrosamines- substances that cause mutations and the development of cancerous tumors.

Phenols contained in the effluents of metallurgical enterprises, in drinking water in the presence of chlorine and in the light can turn into dioxins. These are lipophilic compounds that easily integrate into cell membranes, infect immunocompetent cells, cause congenital malformations in children and tumor diseases.

11.7.2. Biological food contaminants: toxic substances produced by bacteria, lower fungi, unicellular algae; biologically active compounds contained in higher plants.

Mycotoxins- produced by microscopic fungi - mold. Many of these substances can accumulate in the body and cause embryotoxic, mutagenic and carcinogenic effects. For instance, aflatoxin, produced by fungi that infect peanuts and corn, is the strongest liver poison with a pronounced carcinogenic effect.

Algotoxins- are synthesized by lower algae. Poisoning occurs when swimming in bodies of water contaminated with such algae, and eating fish that live in them. For instance, toxoid, causes blockage of neuromuscular transmission, which leads to paralysis of the skeletal and respiratory muscles.

Vegetable glycosides- may be contained in products in doses comparable to pharmacological ones. Solanin- is formed in potato tubers under the influence of sunlight. It has an irritating effect on mucous membranes, inhibits the activity of the central nervous system.

Vitamins. The history of letters with numbers, or What is provitamin B5

A.E. Lyubarev

It just so happens that the terminology of vitamins is rather confusing. Many, probably, wondered: why are there vitamins B6 and B12, but nothing is heard about vitamins B4, B7, B8, B10 and B11? Why are there vitamins K and P, but not known, say, vitamin L or N? The simplest answer is that it happened historically. But you can try to figure out why it happened that way.

Discovery of vitamins

For the first time, the conclusion about the existence of unknown substances, absolutely necessary for life, was made by Nikolai Lunin in 1880. In his dissertation (by modern standards - thesis), carried out at the University of Dorpat (now Tartu), he discovered that mice cannot survive by eating an artificial mixture of protein, fat, sugar and mineral salts.

Lunin's conclusion was not recognized, even his leader G. Bunge was skeptical about this idea. And it can be understood. Back in the XIV century. the English philosopher William of Ockham declared: "Entities should not be multiplied unnecessarily." And this principle, known as "Occam's razor", scientists have adopted.

So in the case of Lunin's discovery, the scientific world was in no hurry to admit the existence of some unknown substances. Scientists initially wanted to make sure that the death of mice was not due to a lack of substances already known. There were many assumptions: a violation of the "normal combination of organic and inorganic parts", the inequality of milk and cane sugar, a lack of organic phosphorus compounds, etc.

And yet Lunin was right! His work was not forgotten; on the contrary, it stimulated further research in this direction. But the level of Lunin's experimental skill was not surpassed for a long time. His followers often received erroneous results due to either insufficient purification of substances, or coprophagia (eating one's own feces), or insufficient duration of experiments.

Every little thing mattered. For example, Lunin took not milk, but cane sugar. Critics have drawn attention to this: Lunin's artificial mixture is not entirely adequate to milk. But those who used milk sugar did not take into account that it was not sufficiently refined: later it turned out that it contained B vitamins as an impurity.

It took thirty years to make sure that failures in feeding animals with artificial mixtures were not associated with a lack of nucleic acids, phospholipids, cholesterol, essential amino acids, and organic iron complexes in the diet. And the conclusion that food contains in very small quantities substances absolutely necessary for life became more and more obvious.

At that time, doctors were trying to understand the causes of such common diseases as scurvy, beriberi and pellagra. It has been repeatedly suggested that these diseases are associated with malnutrition, but it was impossible to prove this point without experimental testing in animals.

In 1889, the Dutch physician H. Eikman discovered a disease in chickens similar to beriberi. The disease was caused by eating polished rice. Several years later, Norwegian scientists were able to induce experimental scurvy in guinea pigs and show that it is also associated with a lack of nutrition.

By 1910, sufficient material had been accumulated for the discovery of vitamins. And in 1911-1913. there was a breakthrough in this direction. In a very short time, a large number of works appeared that laid the foundations of the doctrine of vitamins.

In 1910, the director of the Lister Institute in London, C.J. Martin instructed the young Pole K. Funk to work on the isolation of a substance that prevents beriberi. Martin thought it was some kind of essential amino acid. But Funk, having analyzed the literature and performed a number of preliminary experiments, came to the conclusion that the active substance is a simple nitrogen-containing organic base (amine), and applied research methods developed for such compounds.

In 1911 Funk made the first report on the isolation of a crystalline active substance from rice bran. Then he obtained a similar preparation also from yeast and some other sources. A year later, Japanese scientists received a similar drug. As it turned out later, these drugs were not an individual chemical, but showed activity on pigeons in doses of 4-5 mg.

Funk called the substance he discovered "vitamin" ( vitamine): from Latin vita- life and "amine" ( amine) - the class of chemical compounds to which this substance belongs. Funk's great merit is also that he summarized data on diseases such as beriberi, scurvy, pellagra and rickets, and stated that each of these diseases is caused by the absence of a specific substance. He believed that these substances constitute a special chemical group of nitrogenous compounds, therefore he gave them all the general name "vitamins". Funk's article entitled "The Etiology of Failure Diseases" ( The etiology of the deficiency diseases) came out in June 1912. Two years later Funk published a monograph entitled Vitamins.

Almost simultaneously with the aforementioned article by Funk, in July 1912, the great work of the famous English biochemist F.G. Hopkins. In a carefully conducted experiment on rats, he proved that the growth of animals requires substances present in milk in small quantities, while their effect is not associated with an improvement in the digestibility of the main components of food, i.e. they have an independent meaning. Funk knew about Hopkins' work even before this article was published, in his article he suggested that growth factors discovered by Hopkins are also vitamins.

Further successes in the development of the doctrine of vitamins are associated primarily with the work of two groups of American scientists: T.B. Osborne-L.V. Mendel and E.V. McCollum-M. Davis. In 1913, both groups came to the conclusion that certain fats (milk, fish, egg yolk fat) contain a factor necessary for growth. Two years later, under the influence of the work of Funk and Hopkins and getting rid of experimental errors, they became convinced of the existence of another factor - water-soluble. The fat-soluble factor did not contain nitrogen, so McCollum did not use the term "vitamin". He suggested calling the active substances "fat-soluble factor A" and "water-soluble factor B".

It soon became clear that "factor B" and the drug received by Funk are interchangeable, and "factor A" prevents xerophthalmia and rickets. The relationship between vitamins and growth factors has become apparent. Another factor was obtained - antiscorbutic. There was a need to streamline the nomenclature.

In 1920, J. Dremmond combined the terms of Funk and McCollum. In order not to bind vitamins to a specific chemical group, he proposed to omit the terminal "e", and since then this term in languages ​​using the Latin alphabet is written vitamin... Dremmond also chose to retain the McCollum lettering, resulting in the names Vitamin A and Vitamin B. The antiscorbutic factor was named "vitamin C".

Priority dispute

Disputes about priority have arisen for a long time and, perhaps, have not subsided until now. Who is considered the discoverer of vitamins? Probably, this is not the way to put the question. Many scientists have contributed to this discovery. And yet the most significant, apparently, can be considered the contribution of N.I. Lunin, H. Eikman, K. Funk and F.G. Hopkins.

In 1921, Hopkins was awarded the Chandler Medal. In his medal presentation speech, he recognized himself as a pioneer in the discovery of vitamins. And although Funk tried to challenge Hopkins' priority, only Hopkins and Aikman were awarded the Nobel Prize in Physiology or Medicine for the discovery of vitamins in 1929. However, in his Nobel speech, Hopkins admitted that the first experimental evidence for the existence of vitamins was obtained by Lunin.

And what about Lunin? He did not have to continue his research work. He became a pediatrician and in this capacity gained fame and authority. The journal "Pediatrics" in 1929 dedicated to the 50th anniversary of the medical, social, scientific and teaching activities of N.I. Lunin is a separate issue, composed entirely of articles by his students. It is noteworthy that among pediatricians it was well known what an outstanding discovery was made by their colleague at the beginning of his career. But Soviet vitaminologists were not interested in Lunin's personality: the organizers of the 1st All-Union Conference on Vitamins, held in Leningrad in 1934, did not know that Lunin at that time lived and worked in the same city, and did not invite him to take part in the conference. ...

What's the matter here? In the absence of interest in everything that came before the revolution? Or that Lunin was not considered a compatriot? Among the vitaminologists, the prevailing belief was that Lunin did his work in Basel, where his leader G. Bunge later taught. However, Tartu in the 20-30s. was also "abroad".

But in the 40s. everything turned upside down. The assertion of the priority of Russian scientists in all fields of science has become a state policy. And then it immediately became clear that Lunin made his discovery not in foreign Basel, but in "domestic" Tartu, and in general that his discovery was hushed up. A dozen articles have appeared in defense of the priority of Russian vitaminology. Some authors agreed to the point that Funk and Hopkins did not introduce anything new at all in comparison with Lunin. Of course, all this is the cost of that time. Yet, without diminishing the role of other researchers, it is important to note that Lunin did indeed make an outstanding contribution to the discovery of vitamins.

It turned out to be a lot of vitamins

But back to the history of vitamin research. In the 20s. With the development of methods for obtaining experimental vitamin deficiencies and the improvement of methods for purifying vitamins, it gradually became clear that there are not two or not three vitamins, but much more.

Initially, it was found out that "vitamin A" is actually a mixture of two compounds, one of which prevents xerophthalmia, and the other - rickets. For the first, the letter A was preserved, and the second was named "vitamin D". Then vitamin E was discovered, which prevented infertility in rats growing on an artificial diet. Then it became clear that "vitamin B" also consists of at least two vitamins. This is where the first confusion begins: some researchers designated a new vitamin that prevented pellagra in rats and stimulated growth of animals with the letter G, others preferred to call this factor "vitamin B2", and the factor that prevented beriberi - "vitamin B1".

The terms "B 1 "and" B2 "took root. The growth factor retained the name" B2 ", and the factor preventing rat pellagra became" B6 ". Why was index 6 used? Of course, because during this time appeared" B3 "," B4 " and “B5.” Where did they go then?

The name "B 3 "received in 1928 a new substance found in yeast and prevented dermatitis in chickens. For a long time, practically nothing was known about this substance, and ten years later it was found that it is identical to pantothenic acid, which was studied as a yeast growth factor. As a result, the name "pantothenic xylot" remained for this vitamin.

In 1929, a factor was discovered in yeast, which was hastened to be called "vitamin B4". It soon became clear that this factor is not a vitamin, but a mixture of three amino acids (arginine, glycine and cystine).

In 1930, the term "vitamin B5" appeared: this name was proposed for a factor that later turned out to be a mixture of two vitamins. One of them is nicotinic acid, which sometimes continues to be called "vitamin B5", the other is vitamin B6.

And in subsequent years the same process continued: from time to time there were messages about discoveries of new factors, and a new index was added to the letter "B". But only index 12 was lucky. Compounds with other indices either turned out to be not vitamins or already known vitamins, or their action was not confirmed, or the name was not widely used.

And soon the alphabetic classification of vitamins lost its meaning. In the 30s. chemists really took over vitamins. And if in 1930 practically nothing was known about the chemical nature of vitamins, then by 1940 this issue was basically resolved.

Chemists have given all vitamins trivial chemical names. And these names gradually began to replace "letters with numbers": ascorbic acid, tocopherol, riboflavin, nicotinic acid and others - these terms have become common. However, many medical biologists have remained faithful to the "letters".

In 1976, the International Union of Nutritionists (from the English. nutrition- nutrition) recommended keeping the letter designations in group B only for vitamins B6 and B12 (apparently due to the fact that these vitamins have several forms). For the rest, trivial names of substances are recommended: thiamine, riboflavin, pantothenic acid, biotin- or general terms: niacin, folacin.

What is panthenol

Panthenol is a derivative of pantothenic acid. In its molecule, the acid group is replaced by an alcohol one. In the body of animals and humans, panthenol is easily converted into pantothenic acid, so their vitamin activity is comparable. But microorganisms are not able to oxidize panthenol, so for microbes this substance is a poison.

Panthenol has an important advantage: it is very well absorbed when applied to the skin. That is why this drug is so widely used in dermatology and cosmetics.

But still, why is panthenol called provitamin B5? It is customary to call provitamins natural substances that are converted into vitamins in the body of animals and humans. Thus, b-carotene is a provitamin A, ergosterol and 7-dehydrocholesterol are provitamins D. Panthenol is also able to convert into a vitamin - pantothenic acid. However, unlike carotene and ergosterol, panthenol is not a natural substance, but a synthetic product.

Why "B5"? It turns out that among the many names that she was awarded in the 30s. pantothenic acid, there was such a thing. And this name had adherents - back in the 70s. it was found in articles by French physicians. Well, France is known to be a trendsetter, including in the field of cosmetics.

GLOSSARY OF TERMS

Vitamin A- retinol and its derivatives (retinal, retinoic acid, etc.), is necessary for the growth and differentiation of tissues, processes of photoreception and reproduction, its deficiency causes xerophthalmia.

Vitamin C- ascorbic acid, participates in redox reactions, its lack leads to scurvy.

Vitamin D- a group of related substances necessary for bone growth (promote the absorption of calcium and phosphorus), its deficiency causes rickets.

Vitamin E- α-tocopherol and related compounds, one of the main antioxidants in living organisms, its deficiency causes infertility.

Vitamin K- a group of related substances involved in the process of blood clotting.

Thiamin (vitamin B1)- its derivative, thiamine pyrophosphate (cocarboxylase) is part of a large number of enzymes involved in carbohydrate metabolism, a lack of this vitamin leads to disease take it.

Riboflavin (vitamin B2)- its derivatives are part of the enzymes of the respiratory chain.

Pantothenic Acid (Vitamin B3)- its derivatives (coenzyme A, etc.) are involved in the most important processes of synthesis and decomposition of substances.

Vitamin B 6 - a group of related substances (pyridoxine, pyridoxal, pyridoxamine), the derivatives of which (pyridoxal phosphate and pyridoxamine phosphate) are involved in the exchange of amino acids.

Vitamin B 12 - a group of related substances (cobalamins), are part of the enzymes involved in many important processes of synthesis and decomposition of substances, including in the process of hematopoiesis.

Folacin (vitamin B)- folic acid and related compounds, its derivative, tetrahydrofolic acid, is part of the enzymes involved in the most important synthetic processes, including the process of hematopoiesis.

Niacin (vitamin PP)- nicotinic acid and nicotinamide, their derivatives, NAD and NADP, are involved in a huge number of redox processes.

Biotin (vitamin H)- is a part of enzymes that carry out carboxylation (attachment of a carbon dioxide molecule) of organic acids.

AVITAMINOSES

Take it- a disease associated with a lack of vitamin B1. It is characterized by widespread lesions of the peripheral nerves of the extremities. The disease became widespread in the countries of East and Southeast Asia in the 19th century, when the main food product of these countries, rice, began to be peeled from the shell ("polished" rice).

Xerophthalmia- damage to the eyes, expressed in dryness of the conjunctiva and cornea. One of the main causes of the disease is a lack of vitamin A.

Pellagra- a disease associated with a lack of niacin. It manifests itself in lesions of the skin, digestive tract and nervous system. Distributed in countries where the main food is corn.

Rickets- a disease of children associated with a lack of vitamin D. It is characterized by softening of the bones.

Scurvy- Disease associated with a lack of vitamin C. It usually occurs in the absence of fresh vegetables and fruits in the diet. It was often observed among the participants of northern and sea expeditions. It is characterized by bleeding gums, tooth loss, etc.

21. Nutrition as an integral part of metabolism. The concept of adequate nutrition. Partial substitution of nutrients. Irreplaceable food components. Minor food components. Macro-, micro- and ultramicroelements. The biological role of minerals. The importance of the optimal provision of the child's body with irreplaceable nutritional factors. Concepts of endemic diseases: endemic goiter, caries.

Full-fledged called the diet, corresponding to the energy needs of a person and containing the necessary amount of essential nutrients that ensure the normal growth and development of the body.

Factors affecting the body's need for energy and nutrients: gender, age and body weight of a person, his physical activity, climatic conditions, biochemical, immunological and morphological characteristics of the organism.

All nutrients can be divided into five classes:

1. proteins; 2.fats; 3. carbohydrates; 4. vitamins; 5. minerals.

In addition, any diet should contain water as a universal solvent.

The indispensable components of the diet are:

    essential amino acids - valine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan;

    irreplaceable (essential) fatty acids - linoleic, linolenic, arachidonic;

    water and fat-soluble vitamins;

    inorganic (mineral) elements - calcium, potassium, sodium, chlorine, copper, iron, chromium, fluorine, iodine and others.

Mineral (inorganic) substances.

1.6.1. In addition to the six main elements - C, H, O, P, N, S, of which all organic molecules are composed, a person needs to receive about 20 more chemical elements. Depending on the amount in which they should enter the body, minerals are divided into: macronutrients- calcium, chlorine, magnesium, potassium, sodium - the daily requirement is more than 100 mg and trace elements- iron, manganese, copper, iodine, fluorine, molybdenum, selenium, zinc, etc. - daily requirement - several milligrams.

11.6.2. The biological role of minerals: 1. are structural components of tissues (calcium, fluorine); 2. provide water-salt balance (sodium, potassium); 3. are a prosthetic group of enzymes, are part of active centers, stabilize the structure of enzymes and enzyme-substrate complexes (magnesium, iron, copper); 4. participate in the transmission of nerve impulses (calcium); 5. Participate in the hormonal regulation of metabolism (iodine is part of thyroid hormones, zinc is part of insulin).

11.6.3. A deficiency of trace elements in water and food can lead to the development of diseases. For example, a lack of iron and copper can cause anemia, a lack of fluoride contributes to the occurrence of caries, with a lack of iodine in food and water, endemic goiter develops.

Endemic goiter- an increase in the thyroid gland associated with iodine deficiency in the environment.

Normal human growth and development depends on the proper functioning of the endocrine system, in particular on the activity of the thyroid gland. Chronic iodine deficiency leads to the proliferation of gland tissue and a change in its functionality. The main reason for the development of endemic goiter is insufficient intake of iodine into the body. In addition, in the development of endemic goiter, malnutrition with a deficiency of proteins and vitamins, infection, intoxication, unsanitary living conditions, insufficient intake of microelements into the body, intake of such goitrogenic substances of plant and chemical origin as salts of zinc, cobalt and others are important, which are involved in the implementation of iodine deficiency or are the main cause of goiter.

Endemic dental caries- a disease characterized by pathological changes in the metabolism and tissues of the teeth due to insufficient intake of fluoride into the body. Endemic dental caries occurs in areas where the level of fluoride in water (less than 0.5 mg / l) and soils (less than 15 mg / kg) is reduced. The resistance of tooth enamel to the effects of physical and chemical environmental factors is suppressed. The teeth are decalcified. Lack of fluorine leads to disruption of the exchange of phosphorus and other chemical elements. Pathological changes in metabolism cause the development of degenerative processes in the bones, heart and other parenchymal organs.

There are various classifications of chemical elements contained in the human body. So V.I. Vernadsky, depending on the average content (mass fraction ω,%) in living organisms, divided the elements according to a ten-day system. According to this classification, the elements contained in living organisms are divided into three groups: Macronutrients... These are elements, the content of which in the body is higher than 10 x (-2)%. These include oxygen, carbon, hydrogen, nitrogen, phosphorus, sulfur, calcium, magnesium, sodium, and chlorine. Trace elements... These are elements, the content of which in the body is in the range from 10 x (-3) to 10 x (-5)%. These include iodine, copper, arsenic, fluorine, bromine, strontium, barium, cobalt. Ultramicroelements... These are elements, the content of which in the body is below 10 x (-5)%. These include mercury, gold, uranium, thorium, radium, etc.

Human nutrition is one of the environmental factors that significantly affects his health and life expectancy. Nutrition ensures the normal functioning of the organism, its growth, development, adaptability and vigorous human activity. All this is carried out due to nutrients, which, unlike other external factors, become the body's own elements, participating in the metabolism and energy.

According to the Soviet scientist A. A. Pokrovsky, the term "nutrition" in the general biological sense of the word characterizes the entire amount of biochemical processes associated with the intake and transformation of nutrients in the body to provide energy and structural substances to any physiological function.

In the digestive tract, food is digested (broken down to simple substances). During digestion, hydrolysis of polymers (proteins, polysaccharides and other complex organic substances) occurs to monomers, which are absorbed into the bloodstream and are included in intermediate metabolism.

The theory of a balanced diet originated over 200 years ago and has dominated dietetics until recently. Its essence boiled down to the following provisions. Nutrition is considered ideal, in which the flow of nutrients into the body corresponds to their consumption. Food consists of several components, different in physiological significance, useful, ballast and harmful, or toxic. It also contains irreplaceable substances that cannot be formed in the body, but are necessary for its vital functions. Human metabolism is determined by the level of concentration of amino acids, monosaccharides, fatty acids, vitamins and minerals, therefore, it is possible to create the so-called elemental (monomeric) diets. Food utilization is carried out by the body itself.

All this led to the emergence of a new theory - the theory of adequate nutrition. She absorbed everything valuable that was in the theory of balanced nutrition, and was enriched with new provisions.

According to this theory, a necessary component of food is not only useful, but also ballast substances (dietary fiber). The idea of ​​the internal ecology (endoecology) of a person, formed due to the interaction of the host organism and its microflora, was formulated.

Basic nutrients: carbohydrates, fats, proteins, daily requirement, digestion; partial power interchangeability. Interchangeability of foodstuffs - the ability to replace some products in a person's diet with others that are close to them in chemical composition. Interchangeable are, for example, meat, fish and cottage cheese.

22 Basic nutrients. The biological value of various proteins. Daily requirement. Essential amino acids. Nitrogen balance. Violation of protein nutrition. The concept of kwashiorkor.

The biological role of dietary proteins is that they serve as a source of irreplaceable and replaceable amino acids. Amino acids are used by the body to synthesize its own proteins; as precursors of non-protein nitrogenous substances (hormones, purines, porphyrins, etc.); as a source of energy (oxidation of 1 g of proteins gives about 4 kcal of energy).

Dietary proteins are divided into complete and deficient.

Complete dietary proteins - of animal origin, contain all amino acids in the required proportions and are well absorbed by the body.

Defective proteins - of vegetable origin, do not contain, or contain insufficient amounts of one or more essential amino acids. So, grain crops are deficient in lysine, methionine, threonine; potato protein contains little methionine and cysteine. To obtain high-protein diets, plant proteins that complement each other in amino acid composition, for example, corn and beans, should be combined.

Daily requirement: not less than 50 g per day, on average 80-100 g.

11.2.2. Protein deficiency in childhood causes: 1. a decrease in the body's resistance to infections; 2. growth arrest due to impaired synthesis of growth factors; 3. energy deficiency of the body (depletion of carbohydrate and fat stores, catabolism of tissue proteins); 4. loss of body weight - hypotrophy. With protein starvation, edema is observed, which occurs due to a decrease in the content of proteins in the blood ( hypoalbuminemia) and violations of the distribution of water between blood and tissues.

Essential amino acids- essential amino acids that cannot be synthesized in this or that organism, in particular, in the human body. Therefore, their intake into the body with food is necessary.

Indispensable for an adult healthy person are 8 amino acids: valine, isoleucine, leucine, lysine, methionine, threonine, tryptophan and phenylalanine;

Amino acids (free and in the composition of proteins) contain almost 95% of all nitrogen, therefore it is they that maintain the nitrogen balance of the body. Nitrogen balance- the difference between the amount of nitrogen supplied with food and the amount of nitrogen excreted (mainly in the form of urea and ammonium salts). If the amount of incoming nitrogen is equal to the amount released, then nitrogen balance. This condition occurs in a healthy person with a normal diet. Nitrogen balance can be positive (more nitrogen is supplied than is excreted) in children, as well as in patients recovering from serious illnesses. Negative nitrogen balance (nitrogen excretion prevails over nitrogen intake) is observed during aging, starvation and during severe diseases.

With a protein-free diet, the nitrogen balance becomes negative. Compliance with such a diet for a week leads to the fact that the amount of nitrogen excreted ceases to increase and stabilizes at about 4 g / day. This amount of nitrogen is contained in 25 g of protein. This means that during protein starvation, about 25 g of its own tissue proteins are consumed in the body per day. The minimum amount of proteins in food required to maintain nitrogen equilibrium corresponds to 30-50 g / cyt, while the optimal amount for average physical activity is ∼100-120 g / day.

Kwashiorkor- a type of severe dystrophy against the background of a lack of proteins in the diet. The disease usually occurs in children 1-4 years old, although it happens that it also occurs at an older age (for example, in adults or older children).

One of the symptoms - bloating in children (ascites), which often occurs in children in poor regions of Africa, is explained by the fact that cassava tubers contain only a small amount of protein (1.2%) and very few essential amino acids. In a cassava-based diet, these factors lead to baby pellagra ( kwashiorkor). Due to the lack of important amino acids, internal organs accumulate water. In this regard, it is recommended to also use cassava leaves, which contain a large amount of protein, as a vegetable.

23. Carbohydrates and fats as food components, daily requirement, value. Food ballast polysaccharides. Polyunsaturated fatty acids ( w -3, w -6). The biological role of unsaturated fatty acids in the child's body.

The composition of dietary fats consists mainly of triacylglycerols (98%), phospholipids and cholesterol. Triacylglycerols of animal origin are high in saturated fatty acids and have a firm consistency. Vegetable fats contain more unsaturated fatty acids and have a liquid consistency (oils).

Biological role: 1. are one of the main sources of energy; 2. serve as a source of essential polyunsaturated fatty acids; 3. Promote the absorption of fat-soluble vitamins from the intestines. Polyunsaturated fatty acids are necessary for the body to build phospholipids, which form the basis of all cell membrane structures and blood lipoproteins. In addition, linoleic acid is used for the synthesis of arachidonic acid, which serves as a precursor of prostaglandins, prostacyclins, thromboxanes and leukotrienes.

Daily requirement: 90-100 g, of which 30% should be vegetable oils. The nutritional value of vegetable fats is higher than that of animals, since with an equal energy effect - 9 kcal per 1 g, they contain more essential fatty acids.

11.3.2. Violation of the ratio of the proportion of vegetable and animal fats in the diet leads to a change in the ratio in the blood of different classes of lipoproteins and, as a consequence, to coronary heart disease and atherosclerosis.

Characteristics of food carbohydrates.

11.4.1. Dietary carbohydrates, according to their ability to be absorbed by the human body, are divided into two groups:

    assimilable: glucose, fructose, sucrose, lactose, starch;

    indigestible: cellulose (fiber), hemicellulose, pectins.

The biological role of digestible carbohydrates: 1. are the main source of energy for humans (oxidation of 1 g gives 4 kcal); 2. serve as precursors in the synthesis of many biomolecules - heteropolysaccharides, glycolipids, nucleic acids.

The biological role of indigestible carbohydrates: fiber affects intestinal motility, promotes the elimination of cholesterol, prevents the development of obesity and gallstone disease.

Daily requirement: 300-400 g, of which - easily digestible carbohydrates (fructose, sucrose, lactose) - 50-100 g, fiber 25 g, the rest is starch.

11.4.2. An excess of easily digestible carbohydrates in the diet contributes to the development of diseases such as obesity, diabetes mellitus, dental caries. Lack of fiber (fiber) contributes to the development of colon cancer.

Ballast substances are food components contained in plant food and not capable of being digested in the human body. The intake of these substances into the body is guaranteed if we eat a lot of fresh vegetables and fruits, that is, which are not cooked.

The main ballast substances are dietary fibers, which are found in any plant, in the role of their main representative is fiber. Dietary fibers, in turn, are polysaccharides of different structures with huge macromolecules. There are bacteria that are capable of breaking down such compounds with unprecedented ease, but human enzymes cannot.

In recent years, it has been widely discussed role w-3 polyunsaturated fatty acids v prevention atherosclerosis and coronary heart disease. Physicochemical properties of unsaturated fatty acids associated with the presence of double bonds in their structure. As a rule, in solutions fatty acid can take on an infinite number of conformations. However, the double bond restricts the rotation of carbon atoms relative to each other, which provides polyunsaturated bold acids more stable conformational properties and the existence of isomers of a certain structure, depending on the temperature regime and the type of solvent. How w-3 and w-6 polyunsaturated fatty acid(PUFA) are not synthesized in vertebrates and can only be ingested with food. Both types of these polyunsaturated fatty acids take part in the most important physiological and plastic processes, form eicosanoids (prostaglandins, leukotrienes, lipxins, etc.), can be esterified and hydrolyzed to tissue glycerolipids

The effect of fats on children and adolescents

To the begining

During growth and development, the body reacts most strongly (in the form of various diseases) to the negative factors of the surrounding world. As we have already decided, fat is a difference between fat and what kind of fats enter the body of a child and adolescent directly depends on his health, both mental and physical. The greatest harm is caused by trans fatty acids, which easily enter the body if it is not controlled - literally with breast milk.

Research results show that, on average, a woman's milk contains about 20% trans fatty acids of the total fatty acids. Basically, trans fatty acids enter the body of a woman with food, and then penetrate into breast milk. The trouble is that, in parallel with the increase in trans fats in the body of a woman and a child, the amount of essential, beneficial fatty acids, for example, Omega-3, decreases.

What should be done to reduce the amount of trans fats entering the child's body?

Strictly monitor what foods a woman eats before conception, during pregnancy and during breastfeeding.

Get enough antioxidants.

Ensure that the body has the correct balance of Omega-3 fatty acids.

In preschool age, the parents are fully responsible for the future health of children. They must closely monitor their diet to ensure that it contains a minimum of trans fats. At preschool age, the brain develops very rapidly, and if a child receives high-quality fats, this will not only have a positive effect on his health, but also on mental abilities.

School-aged children and adolescents are the most active consumers of trans fats. A donut alone can contain up to 13 grams. A standard packet of chips contains 7 to 8 grams of trans fatty acids. 100 grams of French fries contains 8 grams of trans fatty acids. As a result, it turns out that a teenager eats 30-50 grams of bad fats per day. And this happens at a time when the brain develops most actively and nerve cells must constantly form many new connections.

All foods we eat are made up of six main ingredients. These components that make up any product are called food substances. Nutrients include:
  1. Proteins (animal and vegetable).
  2. Carbohydrates (simple and complex, including fiber).
  3. Fats (saturated and unsaturated).
  4. Vitamins (fat-soluble and water-soluble).
  5. Minerals.
  6. Water.

PROTEINS

Proteins, or as they are also called proteins (from the Greek Protos - the first), are the basis of life and the most irreplaceable part of the human diet. They occupy the most important place in our body both in terms of their content in the cell and in terms of their importance in vital processes, because proteins account for 17% of the total mass of our body. This is the main building material necessary for the formation of new muscle fibers, restoration of injured and replacement of dead tissues of all organs, it is thanks to proteins that all muscle contractions are carried out. In addition, proteins perform a number of vital functions - they regulate all processes in the body, from the generation of energy to the elimination of waste. If the food is depleted in carbohydrates and fats, especially in fasting conditions, it is proteins that serve as reserve nutrients and energy sources.

Proteins are made up of amino acids. Some amino acids can enter our body only as part of food. They are called irreplaceable. Other amino acids are synthesized in our body. Therefore, the usefulness of protein products is determined by the presence of essential amino acids in them.

The closer the amino acid composition of food proteins to the protein composition of our body, the more valuable it is. From this point of view, the most valuable sources of protein are eggs, milk, meat and fish. Vegetable proteins are often lacking in some essential amino acids, so it is necessary to strive for the correct combination of animal and plant products in order to obtain the optimal amino acid ratio. An acceptable level of amino acid balance for women involved in fitness can be ensured if at least 55-60% of proteins of animal origin are included in the diet, the remaining 40% of proteins must be of plant origin. In special cases, during a period of long and intense training loads, animal proteins can make up 30%. In cases where your diet is dominated by plant foods (for example, vegetarians), it is necessary to supplement with essential amino acids in the form of dietary supplements.

The body needs of an adult who leads an active lifestyle is 1.6-2.2 g per 1 kg of body weight.

For one meal, the body can assimilate up to 30-50 g of protein, therefore, it is better to distribute the daily amount of protein evenly over 4-6 meals, since smaller amounts of the product are better absorbed and more efficiently used by the body.

According to the speed of digestion, food proteins are arranged in the following sequence: first, egg and milk, then fish and meat, and finally vegetable. Cooking in most cases makes the proteins more easily digestible. But it should be noted that the methods of preserving protein products, primarily meat, reduce the nutritional value of this product. Freezing and thawing destroys the natural structure of protein molecules, reduces its nutritional value by at least 40%. To get rid of a large amount of fat that is found in meat, it is recommended to cook it by draining the fat broth, or steam it, as well as in an airfryer.

Protein is the most important component of food. Let's briefly list the main protein foods... Firstly, this meat is a high-value food product rich in complete animal proteins, containing all essential amino acids in significant quantities and in the most favorable proportions.

The richest in proteins, up to 20%, are beef, pork, rabbit and poultry.

Beef contains the most complete proteins, which include all the essential and essential amino acids for the body.

Veal is more tender than beef, contains more complete proteins and is easier for the body to digest. Veal of the 1st and 2nd categories contains about 20% protein and 1-2% fat.

Pork is divided into bacon, meat and fatty varieties. In the diet for fitness, it is better to use meat pork as it contains an average of 14% protein and 33% fat.

For comparison, bacon is 3% protein and 63% fat, fatty, respectively 12% and 50%. It is important to take into account that pork tenderloin contains 19% protein and 7% fat.

Rabbit meat is an excellent dietary product with a very high protein content - 21%.

By-products are of great value, as they are characterized by a high content of minerals, especially iron. The liver is rich in iron, vitamins A and B, and contains a large amount of vitamin C. The tongue is dietary product and is very well absorbed. The heart is rich in proteins, minerals, iron and has a low percentage of fat.

Sausages are mostly made from pork and beef, but are high in fat. We do not recommend various types of smoked and semi-smoked sausages containing up to 40% fat or more for those who want to achieve real results in weight loss. Also, we do not recommend such meat products as ham, brisket, ham, loin, they have a very high fat content - Up to 50-60%.

If it is not possible to give up sausages, we recommend sausages and wieners. For the preparation of these products, the meat of young animals is used, which is easily digested and assimilated, therefore this type of meat product is preferable to sausages.

Meat of chicken and broiler chickens contains more complete and better digestible proteins than beef. Chicken proteins have an optimal set of essential amino acids. The amount of fat in the meat of chickens and chickens is quite large, but this fat is easily absorbed by the body, since it includes unsaturated fatty acids.

Fish is a source of high quality protein. Fish protein contains all essential amino acids necessary for the body. Unlike meat, fish proteins contain an essential amino acid, methionine, which is very important for our body.

Another advantage of fish protein is its quick and complete digestibility - by 93-98%, while meat proteins are digested by 87-89%. The protein content of fish depends on the species. For example, in tuna - 24%, grenadier - 7%, hake, flounder, cod, carp and many other fish species have an average of 16% protein.

Fish roe is a valuable food product with a high protein content - up to 30% and more and about 15% fat. Caviar is rich in phosphorus and potassium, water and fat-soluble vitamins.

During weight loss, we do not recommend including salted and smoked fish products in your diet. They, as a rule, due to the peculiarities of their processing, have a protein that is poorly digested and absorbed. Also, we do not recommend widely using canned fish in the diet. Due to the long storage and cooking process, many valuable qualities of the fish are simply lost.

A chicken egg, in comparison with other animal products, contains the most complete protein, which is almost completely absorbed by the body. Eggs contain all essential amino acids in the most optimal proportions. But due to the high amount of fat and high calorie content, we do not recommend eating eggs for those who want to reduce their weight or keep it constant. On average, eating three egg yolks per week is considered optimal; egg white can be eaten in larger quantities.

The best way to eat eggs is to boil them for a short time. Eggs are called "small pantry" for a reason, especially egg white. They include many nutrients: water and fat-soluble vitamins - B, B2, B6, B12, A, D, K, E; pantothenic and folic acid; minerals - phosphorus, sulfur, zinc, iron, copper, cobalt.

FATS

Fats are just as important a nutritional component as proteins. The opinion of many women about the dangers of fatty foods is not entirely true.

Studies show that both excess and lack of lipids (from the Greek Lipos - fat) are harmful to the body.

Fats during prolonged aerobic exercise are the main energy substrate, together with them our body receives fat-soluble vitamins A, D, E, K. The subcutaneous fat layer reduces heat loss in the body and performs a protective function, protecting tissues from mechanical damage during falls and impacts.

The biological value of fats is determined by the presence of polyunsaturated fatty acids in them, which can enter our body only with food.

Food sources of these acids are primarily vegetable oils. It is believed that 25-30 g of vegetable oil provides a person's daily need for polyunsaturated fatty acids. In food, fats are accompanied by other substances related to lipids, among them phospholipids, which play a significant role in the life of our cells, are of particular importance. Phospholipids are the familiar sediment in unrefined vegetable oils. Of the steroids that secrete fats, we are most familiar with cholesterol, which provokes the formation of atherosclerosis. But it is also necessary for the synthesis of hormones and vitamin D in our body. It is wrong to completely eliminate Israel's cholesterol, you just need to limit its intake to 0.3-0.5 g per day.

Most cholesterol is found in foods such as eggs (0.57%), cheeses (0.28-1.61%), butter (0.17-0.21%) and offal. Meat contains on average 0.06-0,%, fish - 0.3% cholesterol.

We do not recommend consuming more than 80-100 g and less than 25-30 g of fat per day, since with a low fat content in the diet, our skin and hair will suffer, resistance to infections will decrease and the metabolism of vitamins A, D, E, K will be disrupted.

We add that there is hidden fat, which is found in the composition of foods - meat, milk, sausages, and explicit, we add to food, like bread and butter. This should also be taken into account when drawing up a diet. Approximately 70% of the total fat should be animal fats and 30% vegetable.

The most useful animal fats are butter and pork fat. Also considered to be of high value fish fat... We recommend using vegetable oils for dressing cold dishes, and certainly unrefined oils. If possible, include in your diet various types of vegetable oil: olive, corn, sunflower, rice, cottonseed, linseed. Avoid margarine and foods that say hydrogenated fats were used in their manufacture.

CARBOHYDRATES

Carbohydrates make up the bulk of the human diet 400-500 g per day. About half of the daily energy value of the diet is also provided by carbohydrates. In addition, they perform protective function- support immunity; plastic function - are part of most cell structures; are used for the synthesis of nucleic acids, which play an important role in the transfer of genetic information and the regulation of metabolism. Carbohydrates are classified into simple, complex, and fiber.

Simple ones are fructose, glucose, sucrose. Complex - starch, glycogen. Fiber is the so-called dietary fiber. Glucose is one of the most abundant and essential energy sources for nerve tissues, heart, muscles and other organs. Most of the carbohydrates in food are converted into glucose in our body and thus absorbed. Fructose is characterized by the greatest sweetness, part of it in our body turns into glucose, and part is directly involved in metabolic processes.

Glucose and fructose are found in fruits, berries, and honey. One of the most common carbohydrates in our diet is sucrose. In refined sugar, its content reaches 99.75%. It is composed of glucose and fructose.

From complex carbohydrates starch is very important in nutrition, which is contained in cereals, potatoes, bread, pasta. In the form of starch, the main amount of digestible carbohydrates enters our body. Ultimately, almost all carbohydrates in our food are converted into glucose and in this form are transferred from the intestines to the blood, but the rate of conversion and appearance in the blood of glucose from different products is different. The mechanism of these processes is reflected in the concept of "glycemic index" (GI). If you want to reduce body fat, lose weight, then we recommend using in your diet more often those foods whose G.I. low, and for a quick recovery, on the contrary, products with a high GI.

Finally, the third group of carbohydrates is dietary fiber. They are practically not absorbed, but they perform a protective function, stimulating the activity of the intestines. They bind cholesterol, salts of heavy metals, many harmful substances and then remove them from our body, stimulating the activity of beneficial microorganisms that live in our intestines. When doing fitness, it is dietary fiber that is an effective means of cleansing the intestines and removing toxins generated during exercise. For positive effects, the intake of dietary fiber in our body in an amount of 30-40 g is sufficient. This need can be satisfied by introducing into the diet of bread made from wholemeal flour, vegetables, fruits, including dried fruits. But do not get too carried away with dietary fiber, although for those who want to lose weight this is useful, since the consumption of foods rich in fiber causes a feeling of fullness with a low calorie content, but additional water intake is required. If you do not have enough fluid, you are at risk of "indigestion" and bloating.

The daily requirement for carbohydrates should be 5-8 g per 1 kg of body weight. By reasonably combining the quantitative ratio and time of intake of proteins and carbohydrates, you will achieve tangible results in shaping your figure.It is generally believed that if proteins are optimally consumed evenly throughout the day, then carbohydrates are recommended to be used mainly in the first half.

Grains and legumes are the most important suppliers of carbohydrates to our body. With these products we get the most vegetable protein, various vitamins, minerals. But it must be borne in mind that all these useful components are concentrated to a greater extent in the germ and shell of the grain. The more significant and higher the degree of their processing, the less our body receives these useful components. In this regard, the most valuable are products obtained from whole grains or including bran. Cereals and products made from them should be the main suppliers of carbohydrates. But we recommend diversifying the consumption of cereals, since each has its own advantages and disadvantages. Semolina products are easy to digest, but poor in vitamins and minerals. Rice is well digestible, contains a lot of starch and protein, but little fiber, vitamins and minerals. Buckwheat contains the most iron, B vitamins, millet and pearl barley contain more fiber. Well, oatmeal is the most useful and high-calorie. It stands out for its high fat content and ranks second after buckwheat in protein concentration, but it is also rich in potassium, phosphorus, magnesium, zinc and B vitamins.

Bread is an integral part of our diet, but let's note some of its features. White bread made from highly refined flour contains easily digestible starch, is easy to digest and has a less pronounced sokogonny effect than rye bread. Black bread is more difficult to digest, but many times more useful and richer in substances necessary for our body. Most importantly, eat whole grain breads, loaves, and whole grain bran rolls. In general, we can say that the rougher the bread, the healthier it is. Drying the bread in a toaster also pays off, as the yeast contained in yeast bread becomes harmless.

Legumes are used primarily as a source of protein, but they contain less essential amino acid and are absorbed by only 50-70%. In addition, legumes contain substances that block the work of certain digestive enzymes, which can disrupt food digestion and damage the walls of the small intestine. Soy occupies a special place among legumes. But consumption of this product has some drawbacks, and we want to warn against being overly enthusiastic about this product. Firstly, soy protein lacks the most essential essential amino acid for our body - methionine; secondly, if you do not carry out long-term heat treatment, and at the same time, as you know, all important substances are lost, then the process of food digestion can be disrupted; thirdly, soy protein has a damaging effect on the intestinal walls and promotes the development of enteritis; fourthly, research in laboratories shows a violation of the processes of reproduction of offspring in animals that were fed with soy.

VITAMINS

Vitamins are vital compounds, without which the normal functioning of our body is impossible. It is impossible to replace them in the process of life with anything.

With a lack or absence of vitamins in our diet, deviations from the norm will surely occur. Lack of vitamin C causes vitamin deficiency, lack of vitamin D - rickets, you are tormented by insomnia, fatigue and depression - this is a lack of vitamin B1, you see poorly, dry skin worries, breathing is disturbed, you are unhappy with the way your hair looks - lack of vitamin A. This is only a small part of the possible hypovitaminosis. Most of the vitamins are not synthesized at all in our body or in very small quantities. This means that we must definitely get vitamins from food. Vitamins act as biocatalysts, that is, they regulate metabolic processes in our body, keep us in good shape and postpone the aging process. We need some vitamins more, others less, but they must be in a strictly defined amount, otherwise they can harm our body.

In our time, the basis is the classification of vitamins by solubility. Allocate fat-soluble and water-soluble vitamins. The fat-soluble group includes vitamins A, D, E and K, they are absorbed by our body only with a sufficient content of fat in food.

Water-soluble vitamins are also called enzymovitamins (an enzyme is an enzyme), because they function as enzyme assistants. Water-soluble vitamins include B vitamins, vitamins C, P, PP, H, N.

Vitamin A is essential for the growth process, ensuring normal vision, and promoting the regeneration of the skin. Vitamin A is found in products of animal origin: liver of animals and fish, oil, egg yolk, as well as in products of plant origin - in various types of vegetables, most of all in carrots, berries and fruits.

Vitamin D is found in fish products, to a lesser extent in dairy products. The lack of this vitamin causes a disturbance in the exchange of calcium and phosphorus, which leads to deformation and softening of the bones.

Vitamin E has an antioxidant effect and is found in vegetable oils, germ seeds of cereals (barley, oats, rye and wheat), as well as in green vegetables.

Lack of vitamin K leads to diseases of the liver and gallbladder, the lack of vitamin K is manifested in the occurrence of bleeding. Contained in spinach, green peas, fish, meat.

From the group of water-soluble vitamins, consider the B vitamins and vitamin C.

B1 - a lack of this vitamin causes a violation of the nervous system. Contained in the embryos and shells of seeds of cereals, in yeast, nuts, legumes, in the liver, heart and kidneys. A rich source is black bread.

B2 - found in large quantities in the liver, kidneys, dairy products and yeast. Lack or absence of vitamin causes growth retardation, reduces the number of leukocytes in the blood, disrupts the function of the digestive system.

B6 - necessary for aerobic exercise, the absence can cause seizures. Enters the body with foods such as Wheat flour, legumes, yeast, liver, nights. The B vitamins also include niacin (PP). Contained in fish, bread, liver. The deficiency can cause dermatitis, impaired bowel function.

B12 - enters our body as part of animal products (kidneys, liver, fish). If the absorption of vitamin B12 is impaired, anemia may occur, which is associated with the suppression of red blood cells.

Vitamin C, or ascorbic acid, is found in fresh fruits and vegetables. They are rich in citrus fruits, bell peppers, dill, spinach, parsley, currants, tomatoes, rose hips, cabbage. Heat treatment, grinding and long-term storage, as well as canning, reduce the vitamin C content in food.

C-vitamin deficiency causes scurvy, reduces physical performance, weakens the work of the cardiovascular system.

Modern nutritional science considers vitamins as an important means of preventing disease, increasing efficiency, slowing down the aging process. Let's look at the depletion of vitamin stores in the body. First of all, this is due to the quality of products and non-observance of the conditions for their storage and preparation, such as prolonged cooking of finely chopped vegetables, the destruction of vitamin C under the influence of chlorophyll in a salad of chopped tomatoes with onions (it is rational to add table vinegar to this salad).

Vitamin A is destroyed by exposure to ultraviolet light or by strong and prolonged heating. So the presence of vitamins in vegetable stew is very problematic. Another group of reasons for the destruction of vitamins is associated with our health, primarily with the gastrointestinal tract.

In chronic diseases, as well as under the influence of antibiotics and with the wrong medication, the absorption or assimilation of vitamins and minerals is impaired. The need for vitamins increases with infectious diseases and stress, with a sharp change in the climatic-geographical zone, during pregnancy and lactation, in living conditions in ecologically unfavorable zones. The need for vitamins always increases, especially among women, when doing active sports. The above list of the causes of vitamin deficiency is far from complete, but it makes it possible to understand the complexity of the natural dependence of our body on the way of life, the environment, on the quality and quantity of food.

Recall that dry skin is associated with insufficient intake of vitamins A, C, B2, B6, K; poor condition of hair and nails - deficiency of vitamins A and C; pallor of lips - lack of C and B2; the formation of acne - vitamin A. When doing fitness, be sure to include vegetables, herbs, roots, fruits and berries in your diet.

The minimum required amount of vegetables is 400 g of eight items: cabbage, beets, carrots, turnips (radish, radish), tomatoes, cucumber, onion, garlic, as well as herbs - dill, celery, tsitzmat, parsley. Fruits, berries 300 g: apples, citrus fruits, currants, etc. This required minimum can be increased, provided that there is a little for each meal. There should be at least four receptions, This will allow you to eat plant foods in small volumes for better digestibility.

We also add that an additional intake of multivitamins and minerals is necessary not only in autumn, winter and spring, but at any time of the year.

MINERALS

Nutritionists have about 30 minerals necessary for the existence of our body. They are classified into two groups: micronutrients and macronutrients. Many people with active lifestyles underestimate the role of minerals in nutrition. Understanding the importance of proteins, fats and carbohydrates as the main plastic and energy material, knowing that vitamins are necessary to maintain health and high performance, we have a very vague idea of ​​the biological significance of minerals. Meanwhile, they perform various functions in our body: they are part of the bones as structural elements, they are contained in many enzymes responsible for the metabolism in our body, they can be found in hormones.

For example, with the participation of iron, oxygen is transported; sodium and potassium ensure the functioning of our cells; calcium provides bone strength. It is safe to say that minerals play a huge role in the functioning of our body. Minerals are low molecular weight substances, salts and salt ions. You need to know that they are not synthesized in the body and, therefore, must be taken with food.

Macronutrients are found in the body in large quantities, the daily requirement for them ranges from 0.4 to 5-7 g. Macronutrients are part of tissues, muscles, bones, blood; provide salt and ionic balance of body fluids. These include calcium, phosphorus, magnesium, sodium, potassium, chlorine, and sulfur.

Trace elements are substances, the content of which in the body is 1 mg per 1 kg of body weight or less, the daily requirement is 10-20 mg. Trace elements are part of hemoglobin, vitamin B12, hormones and enzymes. 14 trace elements are recognized as vital for our body: iron, copper, manganese, zinc, cobalt, genus, fluorine, chromium, molybdenum, vanadium, nickel, tin, silicon, selenium.

As with vitamins, it is not possible to consume as much food to maintain a balance of minerals. Therefore, it is necessary to take multivitamin preparations that contain the necessary supplements of minerals and trace elements.

The main sources of minerals are found in bread, cereals, table salt, meat, fish, vegetables, herbs, fruits, poultry and seafood.

WATER

Water is no less an important component of nutrition, like all the listed nutrients, because in the body of an adult4 water makes up 60% of the total body weight.

Water enters our body in two forms: in the form of liquid - 48%, in the composition of dense food - 40%, 12% are formed in the processes of metabolism of nutrients. The results of modern research prove the fallacy of the opinion that drinking a lot is harmful, but try to refrain from the fantastic recommendations of some publications that you need to drink up to 1 liter of mineral water every quarter hour of training.

The normal water balance for a healthy body in a comfortable environment is about 2 - 2.5 liters of fluid per day. A fluid balance deviation of 1% is considered a sign of dehydration, 7% is a disaster. It was found that with moderate physical activity for one hour, water losses are 1.5-2 liters at a temperature of 20-25 degrees. Therefore, fluid replenishment after exercise is an important recovery tool. The main recommendations for a drinking regimen with regular fitness classes are as follows:

  1. 1. Since the body loses sodium, potassium and magnesium with sweat during exercise, there may be a temporary lack of these important minerals, so 40-60 minutes before training you need to drink 400-600 ml of isotonic carbohydrate-mineral drink (or just mineral water which contains these minerals), which will create a reserve of glycogen, vitamins and minerals.
  2. 2. The most effective way to replace fluid loss is fractional fluid intake - every 15-20 minutes, small portions of 25-70 ml of water or carbohydrate-mineral drinks. The total amount of liquid should be 200-250 ml.
  3. 3. After training, you should replace the loss of fluid by the body in a volume of up to 350-400 ml. water.
  4. 4. It is necessary to completely exclude carbonated drinks such as Cola, Fanta, Sprite, they contain dyes, carbon dioxide, sugar substitutes and extracts, which is not entirely useful. It is better to replace them with natural mineral water such as "Narzana" and "Borjomi". You can drink plain water or drinks made from rose hips, black currants, and lemon.

Sports nutritionists argue that people who are actively involved in sports are often bombarded with incorrect information. For example, a woman should consume 8 glasses of water daily. This is an overly simplistic approach that does not take into account the individual needs of the body. For many active women, eight glasses of water may not be enough. Also, if you drink only when you want, we run the risk of replenishing the loss of fluid by only two-thirds. One must be loaded with water, not relying on subjective sensations. You can drink up to four liters of water per day, not counting liquid foods and drinks.

NUTRITIONAL SUPPLEMENTS

You have already learned about the essential nutrients that are components of any food, and which must be included in your daily diet. But you've obviously noticed that it can often be difficult to provide optimal nutrition from conventional foods. After all, how much food should be consumed in order to compensate for the deficiency of vitamins and minerals on a daily basis, as well as to support our body while adjusting body weight. Therefore, it can be argued that good nutrition, taking into account your active life, can be provided only through a combined diet, which includes both conventional food products and specialized food products.

These days, counters are bursting with an abundance of different nutritional supplements. Deciding which product you want is like re-mastering a chemistry textbook. How to figure out what to use, when and what effect to expect, if some recommend only protein mixtures, others - individual amino acids, others - extracts from the internal organs of animals, fourth - seafood powders or herbal preparations.

First, let's understand what food additives are. This is a group of products that include a complex of nutrients that have a targeted effect on the metabolism in our body, as in physical activity, and in the subsequent rest period. Basically, food additives are divided into three groups: protein and complex mixtures, carbohydrate-mineral drinks, vitamin-mineral complexes. "

The use of nutritional supplements will help you improve your adaptation to physical activity, replenish nutrition with missing components, regulate body weight or muscle mass, and accelerate the body's recovery process after exercise. It is very important to consider that food additives often contain potential allergens such as flavors and preservatives. So, before buying a large package, experiment with a small one and be prepared for the fact that the effect of sports nutrition preparations is not instantaneous, usually the body gets used to a new product for 2-3 weeks and only then begins to benefit.

Let's talk about carbohydrate drinks. To train at full strength, we sometimes just need a source of energy. The level of glucose in our blood is enough for 4-8 minutes of training. Glycogen or glucose concentrate "stored in muscle and liver" will help you exercise for an hour. In an hour, our body will begin to use an emergency source of energy - to "burn" the muscles. But the efficiency of such fuel is low, as there is a depletion of glycogen stores and, consequently, rapid muscle fatigue. In order not to deplete its own internal reserves, the sports industry has created low-carb drinks. They effectively increase endurance and protect our muscles. If your workout lasts more than an hour, we recommend drinking 100-200 g of the drink every 20 minutes.

Low-carb drinks are an aqueous solution of glucose and sucrose. These carbohydrates are quickly absorbed and replenish melting glycogen stores. There is a wide selection of such drinks on the Russian market. For example, "Leader Shock". It contains guarana extract, vitamin C and minerals. We recommend taking it during or before training, especially in hot and / or humid weather. Another example of an isotonic drink is POWERADE. This drink with the unique Liguid 8 System formula combines fast and slow action carbohydrates; mineral salts of potassium, magnesium, sodium, vitamins B, B6, PP, H and E. Among the indisputable advantages are very convenient packaging (due to the special shape of the bottle neck).

We have dealt with carbohydrate drinks, let's move on to protein shakes. It is a protein powder that is mixed with water or skim milk, depending on the purpose. Protein shakes contain 40 to 70 grams of protein per serving. To provide muscles building material for growth, shakes can be drunk before training. Protein supplements will help or restore firmness to your muscles. Protein is not doping, its excess will be excreted by the body in the urine. If you are over 30 years old, then you should consume less natural protein: it is less digestible and full of fats. We recommend switching to protein shakes by adding fish to the weekly diet (2 times) (preferably sea fish, for example, salmon or tuna). On the Russian market, protein cocktails are widely represented in the Lady Fitness series.

The Lady Fitness series of food supplements and other products also features fat burners. The active components of these fat burners are ephedra, caffeine, L-carnitine.

The most effective is the combination of ephedrine with caffeine. Such preparations are produced both in the form of drinks - "Leader-L-carnitine", and in the form of capsules - "Lady fitness" - "L-carnitine".

Moreover, the latter drug, that is, eating L-carnitine in capsules, helps to convert excess fat into useful energy, improves the functioning of the immune system, activates the removal of toxins from the body, and has a beneficial effect on the cardiovascular system.

The Lady Fitness series introduces two more drugs that are aimed at accelerating fat burning. The first is the unique Fit Factor night formula. You sleep - "Fit Factor" works. The drug actively converts excess fats into energy, improves disease resistance, reduces fatigue and increases vigor, also improves skin condition, strengthens joints and increases muscle elasticity.

The second preparation is a synergistic fat burning system with a powerful thermogenic effect - "FAT BURNER SYSTEM". The drug promotes active processing of excess fat I into energy. Now we should make a reservation, if someone thinks that it is worth taking a capsule and the drug will begin to act on its own, we will upset you - these systems are effective only in combination with physical activity.

Complexes for health are no less popular among women: "Flex Formula" - improves the condition of the skin, hair, nails, joints; and "Vita Complex" - a natural complex of vitamins and minerals, which includes their balanced combination, so necessary for women's health.

Another type of weight loss supplement is meal replacement. Each packet of the drug contains proteins, fats and carbohydrates in the right proportions. The energy value such a bag corresponds to a one-time meal - 300 calories. We recommend using them for particularly tough diets, or for working women, since there is absolutely no need to rack your brains counting calories. Experiment and research to replace natural products this food supplement has shown its complete harmlessness, even in the case of prolonged use. Best taken after exercise or during weight loss. The drug is called "Extreme smoothie".

As for vitamins and minerals, then, as we already wrote, they should be taken regardless of the time of year, especially since with active physical exertion, our body's need for minerals and vitamins increases approximately one and a half to two times.

The best effect is given by preparations in which vitamins, micro- and macroelements are combined and balanced. The most optimal are Oligovit, Komplevit, Glutamevit. It is best to distribute the intake of vitamins and minerals evenly throughout the day. Since water-soluble vitamins, especially the B-complex and C, many minerals are quickly excreted in the urine, we recommend taking them after breakfast, lunch and dinner, which will ensure the stable retention of these substances in the body.

Try to buy drugs of the prolonged form, which provides a gradual release and absorption of the substance within 8-12 hours. Without prolongation, they are rapidly absorbed into the bloodstream, and, regardless of the dose, are excreted in the urine within 2 to 4 hours.

Vitamins- low molecular weight organic compounds that enter the body with food and ensure the normal course of biochemical and physiological processes. Vitamins are not incorporated into tissue structure and are not used as an energy source. Classification of vitamins. Vitamins are divided into two groups: vitamins, soluble in water and vitamins, soluble in fat. Water-soluble vitamins- B1, B2, B6, B12, PP, H, C, folic acid, pantothenic acid. Fat-soluble vitamins - A, D, E, K. For each vitamin, in addition to the letter designation, there is a chemical and physiological name. Physiological name usually consists of the prefix anti- and the names of the disease, the development of which is prevented by the vitamin (for example, vitamin H - antiseborrhoeic). 11.5.3. Provitamins Some vitamins can be synthesized directly in the human body. Compounds that serve as precursors for the synthesis of vitamins in the cells of the human body are called provitamins... For example, the provitamin of vitamin A is carotene, vitamin D2 is ergosterol, and D3 is 7-dehydrocholesterol. 11.5.4. The biological role of vitamins. Vitamins, getting into the body, are converted into their active form, which is directly involved in biochemical processes. The biological role of water-soluble vitamins is that they are part of coenzymes involved in the metabolism of proteins, fats and carbohydrates in the cells of the human body. Table 1 lists examples of vitamins and their biological role. Table 1. Coenzyme functions of water-soluble vitamins.
Vitamin Coenzyme Type of reaction catalyzed
B1 - thiamine Thiamine diphosphate (TDF) Oxidative decarboxylation of α-keto acids
B2 - riboflavin Flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD)
B3 - pantothenic acid Coenzyme A (HS-CoA) Transfer of acyl groups
B6 - pyridoxine Pyridoxal Phosphate (PF) Transamination and decarboxylation of amino acids
B9 - folic acid Tetrahydrofolic acid (THFA) Transfer of one-carbon groups
B12 - cyanocobalamin Methylcobalamin and deoxyadenosylcobalamin Transmethylation
PP - nicotinamide Nicotinamide adenine dinucleotide (phosphate) - NAD + and NADP + Redox

11.5.6. Diseases of inappropriate consumption of vitamins. To ensure the normal course of biochemical processes, a certain level of concentration of vitamins must be maintained in the human body. When this level changes, diseases develop with symptoms characteristic of each vitamin.

Hypervitaminosis -diseases, caused by an excess of vitamins in the body. Typical for fat-soluble vitamins that can accumulate in liver cells. Most often, there are hypervitaminosis A and D associated with an overdose of their drugs. Hypervitaminosis A is characterized by general symptoms of poisoning: severe headaches, nausea, weakness. Hypervitaminosis D is accompanied by bone demineralization, calcification of soft tissues, and the formation of kidney stones.

Hypovitaminosis -diseases caused by a lack of vitamins in the body. Primary hypovitaminosis associated with a violation of the processes of intake of vitamins into the body at: 1. lack of vitamins in food; 2. accelerated breakdown of vitamins in the intestine under the influence of pathogenic microflora; 3. Violation of the synthesis of vitamins by the intestinal microflora in case of dysbiosis; 4. impaired absorption of vitamins; 5. taking medications - antivitamins. Secondary hypovitaminosis associated with a violation of the processes of transformation of vitamins into their active forms in the cells of the human body. The reason may be genetic defects or disorders of biochemical processes in various diseases of organs and tissues.

Vitamin deficiency - diseases caused by a complete lack of vitamin in the body.