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The value of protein in human life
The properties of a protein depend both 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 are called interchangeable. Some amino acids do not form in the human body - these are essential amino acids. Proteins containing the entire set of essential amino acids are biologically complete. They are found in animal food, and in some food plants - soy, 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 be supplied with food, a deficiency of at least one of them can lead to the death of the body, 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 life. Enzymes are built from proteins - biological catalysts that accelerate the course of chemical reactions in the body.
And the fact that meat food makes people irritable and cruel, by analogy with predatory animals, also does not hold water. Indeed, as advocates of vegetarianism argue: "Herbivorous animals are flexible in nature, even nature has not deprived them of strength and strength. Take for example the elephant - it is powerful and kind, and lions are characterized by ferocity and bloodthirstiness." Although the zoological arguments, and we already realized this, are contradictory, it is not difficult to see that in these primitive reasoning the causes are replaced by the consequences: it is not meat food that makes predators predatory, but people of a certain warehouse that are aggressive and socially dangerous. According to these considerations, it turns out that if you feed a lion with a carrot, it will become as quiet as a rabbit, and the rabbit will become wild with meat. But for some reason it seems to me that both will die before they can get used to food unusual for them.
An uncompromising vegetarian, in order to get 50-70 g of fat, must eat 4-5 kg of plant-derived foods daily, and at least 70% of them should be oilseeds. Thus, a partial and all the more complete rejection of animal products today can also be regarded as a tribute to “fashionable” diets.
The fact that the protein is involved in the formation of muscle tissue, as it goes without saying, but not everyone knows that it is involved in the construction of the skeleton.
This is due to the fact that protein food helps the absorption of calcium, while a decrease in protein levels in food impairs the absorption of this element of the intestinal mucosa. But more than 90% is concentrated in human bones: it is this element that gives strength to the skeleton. However, the functions of calcium in the body are not limited to this; it increases the excitability of the neuromuscular system, promotes blood coagulation, and reduces the permeability of the walls of blood vessels. Calcium is involved in the work of the heart muscle, promotes the therapeutic effect of cardiac glycosides, stimulates liver function, activates the lipase enzyme. Therefore, protein foods enriched with calcium, especially milk and dairy products, are biologically more complete in comparison with purely plant foods with a low calcium content.
Calcium deficiency in the body, provoked by the rejection of animal proteins, leads to a violation of a number of physiological functions, in particular, mental and physical performance decreases, bone formation is inhibited in children, and in adults, bones are resorbed.
The following historical example is very revealing in this respect.
In 1857, 8 years old, Vanya Pavlov, the future Nobel Prize laureate, fell from a high platform and became ill after that.
Maybe the boy would not have survived if his godfather, hegumen of the Trinity Monastery in the suburbs, 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 was engaged in gymnastics, in the summer he was forced to swim, ride horses, play towns, and in winter - to rake snow and skate. The boy always and eagerly helped the hegumen to cultivate the garden. The abbot himself was distinguished by enviable health, which he confidently considered a consequence of a healthy diet. Later, Ivan Petrovich Pavlov wrote that indifference to food is imprudence, and more than once said that it was thanks to proper nutrition that he retained high working capacity, stamina and clarity of thought until his full 86 years.
A completely opposite metamorphosis occurred with another representative of the Russian intelligentsia, who decided to become a vegetarian at an advanced age. Unlike little Vanya, who was ill in childhood, little Levushka was an unusually healthy boy, and even in his mature years, fighting near Sevastopol, Lev Nikolaevich did not complain about his health. Having retired and, by the definition of V. I. Ulyanov-Lenin, becoming a "seasoned human being", Tolstoy hit people with physical health, dragging water, cycling and skating at almost 80 years old. True, the world famous writer stopped eating meat only when he was old after a scene he saw at the Tula massacre, when the skin was torn from a fallen bull, and life still fought in the huge body of the animal and large tears rolled from its blood-stained eyes. Returning to Yasnaya Polyana, Lev Nikolaevich, for reasons of an exclusively moral order, completely refused meat and literally immediately his appearance began to change. Here is what his wife Sofya Andreyevna wrote 7 years before the death of the writer: “It is so painful for me to see him as a suffering, weak, dying and oppressed spirit and body. You will take his head in both hands or you will kiss his emaciated hands with gentle gentle caress, and he will look indifferent. Something is happening in him, what is he thinking? " The change that occurred with L. N. Tolstoy after the transition from his usual mixed food to vegetable was completely understandable and quite understandable.
A deficiency of food protein negatively affected the life of his body. First of all, the nitrogen balance was disturbed, and protein breakdown began to prevail over its synthesis. Lacking protein, the body began to “feed” on its own tissues. Not surprisingly, seven years later, the final clouding of reason led Tolstoy to death.
Protein deficiency in nutrition reduces the body's resistance to infections, as the level of antibody formation is reduced. The synthesis of other protective factors is also disturbed - lysozyme and interferon, due to which the course of inflammatory processes is aggravated. Reducing the intake of protein from food, or increasing 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. A lack of protein worsens the appetite, which in turn reduces the influx of protein with food - a vicious cycle occurs.
In order to prevent this from happening, you need to constantly introduce the physiologically necessary amount of protein with food into the body.
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The value of protein in human life
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