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The value of protein in human life
Properties of a protein depend on its composition and on the location of amino acids in the molecule. Moreover, the order of amino acids in the protein molecule plays a very important role in the performance of their functions.
Amino acids synthesized in our body, called interchangeable. Some amino acids in the human body are not formed - it is an essential amino acid. Proteins containing the entire set of essential amino acids are biologically complete. They are contained in animal food, and in some food plants - soybeans, peas, beans.
If we take the value of milk proteins (it contains all the essential amino acids) for 100, then the biological value of meat and fish can be expressed as 95, potatoes - 85, rye bread - 75, rice - 58, peas - 55, wheat - 50.
All essential amino acids must come with food, a deficiency of at least one of them can lead to the death of the organism, since each of the essential amino acids affects certain of its functions.
The importance of proteins is not only in digestion, but also in all human activity. Enzymes are built from proteins - biological catalysts that accelerate the course of chemical reactions occurring in the body.
And the fact that meat food makes people irritable and cruel, by analogy with predatory animals, also does not hold water. After all, as advocates of vegetarianism argue: "Herbivorous animals differ in their appeasable temper, nature has not cheated them even by force and power. For example, taking an elephant is powerful and kind, and ferocity and bloodthirstiness are inherent in lions." Although the zoological arguments, and we have already understood where to go are contradictory, it is easy to see that in these primitive arguments the reasons are replaced by consequences: it is not meat food that makes predators predatory, but people of a certain stock aggressive and socially dangerous. According to this reasoning, it turns out that if you feed a lion with carrots, it will become as quiet as a rabbit, and the rabbit will become dead from meat. But for some reason it seems to me that both of them will die before they have time to get used to the food that is unusual for them.
An uncompromising vegetarian, to get 50-70 g of fat, should eat 4-5 kg of vegetable products daily, and at least 70% of them should be oilseeds. Thus, the failure of a partial and even more complete from animal products today can also be viewed as a certain tribute to the "fashionable" diets.
The fact that the protein is involved in the formation of muscle tissue, as if it goes without saying, but not everyone knows that it also participates in the construction of the skeleton.
This is due to the fact that protein food helps the absorption of calcium, while reducing the level of protein in food impairs the absorption of this element of the intestinal mucosa. But after all, more than 90% of calcium in human bones is concentrated: it is this element that gives strength to the skeleton. However, these functions of calcium in the body are not exhausted; it increases the excitability of the neuromuscular apparatus, promotes blood clotting, reduces the permeability of the walls of blood vessels. Calcium is involved in the work of the muscles of the heart, contributes to the implementation of the therapeutic effect of cardiac glycosides, stimulates the function of the liver, activates the enzyme lipase. Therefore, protein foods enriched with calcium, especially milk and dairy products, are more biologically more complete than foods of especially plant origin with a low calcium content.
Calcium deficiency in the body, triggered by the abandonment of animal proteins, leads to disruption of a number of physiological functions, in particular, mental and physical performance decreases, in children the formation of bones is inhibited, and in adults bones dissolve.
The following historical example is very indicative in this respect.
In 1857, 8 years old, Vanya Pavlov, the future winner of the Nobel Prize, fell from a high platform and became ill after that.
Maybe the boy would not have survived if the godfather, the abbot of the suburban Trinity Monastery, had not taken him to him. The old man knew the healing power of protein nutrition and, therefore, fed his godson with eggs, milk, and boiled chickens. In the mornings he did gymnastics with him, in the summer he forced him to swim, ride, play in the towns, and in the winter to rake the snow and skate. Always and willingly helped the boy to the abbot about the garden and the garden. The abbot himself was distinguished by enviable health, which he believed with conviction as a result of healthy eating. Later, Ivan Petrovich Pavlov wrote that indifference to food is unreasonable, and said more than once that it was thanks to proper nutrition that he retained high performance, endurance and clarity of thought until his full 86 years.
The completely opposite metamorphosis occurred with another representative of the Russian intelligentsia who decided to become a vegetarian in their old age. Unlike little Vanya, who was sick as a child, little Levushka was an unusually healthy boy, and even in his mature years, fighting near Sevastopol, Lev Nikolayevich did not complain about his health. Upon his retirement and, by definition, V. I. Ulyanov-Lenin, becoming a "seasoned man," Tolstoy struck those around him with physical health, carrying water, riding a bicycle and skating almost 80 years. True, the world-famous writer stopped eating meat only to old age after the scene he saw at the Tula slaughter, when they began to tear off the skin of a fallen bull, and life was still beating in the animal’s huge body and large tears rolled from his blood-soaked eyes. Having returned to Yasnaya Polyana, Lev Nikolayevich, for reasons of purely moral order, completely abandoned meat and literally immediately begins to change its appearance. Here is what his wife, Sophia Andreevna, wrote 7 years before the writer's death: “It is so painful for me to see him suffer, weak, sinking and depressed in body and spirit. indifferent. Is something happening in him that he thinks? " The change that occurred with L. N. Tolstoy after the transition from the usual for him mixed food to vegetable food, is completely understandable and completely explainable.
Lack of food protein has a negative impact on the functioning of his body. First of all, the nitrogen balance was disturbed, and the breakdown of the protein began to prevail over its synthesis. Lacking protein, the body began to "eat" its own tissues. Not surprisingly, seven years later, the final clouding of reason led Tolstoy to death.
The lack of protein in the diet reduces the body's resistance to infections, as the level of antibody formation decreases. Synthesis and other protective factors - lysozyme and interferon - are disturbed, which is why the course of inflammatory processes is aggravated. A reduction in protein intake from food, or an increase in its consumption in the body (with heavy physical work or as a result of illness) causes protein deficiency. A severe form of protein deficiency is called kwashiorkor. This disease is more common in children. In Russia, kwashiorkor is not observed, but the disease is often found in the developing countries of Asia, Africa, Central and South America.
Uncompensated protein in the body adversely affects the activity of the cardiovascular, respiratory and other systems. The lack of protein worsens the appetite, which in turn reduces the influx of protein with food - a vicious circle occurs.
In order for this not to happen, it is necessary to constantly introduce into the body a physiologically necessary amount of protein in the diet.
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The value of protein in human life
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