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The corporal proteins, which constitute 20% of the human body, account for more than half of our body weight without liquids and are essential for children´s growth and for the maintenance of the adult body.
In addition to building and regenerating body tissue, proteins act as defences (making a contribution to the formation of antibodies and regulation factors which act against infections and foreign agents) and transport (carrying the oxygen in the blood, such as haemoglobin).
The basic components of proteins are amino acids. The human body needs a total of 20 amino acids. The lack of any of these essential amino acids in one's diet can cause serious problems of malnutrition and illness.
Foods containing proteins are essential in our diet, especially so after recovering from illness or serious injury or when a mother is nursing.
Proteins can be found in foods of both animal and vegetable origin, although in the latter case they are of low biological value (determined by the quotient between the nitrogen absorbed and retained and that absorbed in the intestinal tract).
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