Lecturer at the Department of English Language, Fergana State University, Uzbekistan
Keywords:Nitrogen, physiological, enzymes, carbohydrates
One of the main factors of the external environment for man is food. Food replenishes the body's energy expenditure and ensures the plastic exchange of cells and the body. A person needs at least 2,500 kcal of energy per day, which is replenished mainly by carbohydrates, fats and proteins. Easy-todigest animal, poultry and fish products are the main sources of protein. Food should be high quality and high in calories, with enough vitamins (especially vitamins that are not synthesized in the human body) in addition to protein, fat and carbohydrates. The body also needs enzyme-activating proteins and minerals (Na, K, Ca, Mn, C, S, P, etc.) that are part of biologically active substances.
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