It is recommended to reduce the norm with 1 g protein on 1 kg body weight up to 0.8-10.5 g/kg. This is dictated by the test results, and not some other respects, e.g.. economic. It was also determined, that the individual variability in the demand is OK. 80 % and it was included in this recommendation. Norms in terms of the development of human nutritional sciences do not provide for increased protein demand when performing physical work. It was found, that 11-12%.
Until recently, the position of nutritionists and doctors on excessive consumption of animal protein was very tolerant. Two- and even three times exceeding the norm was tolerated and treated as an expression of the growth of the wealth of society. We currently know, that this is an wrong approach. Proven, that amino acids absorbed from the digestive tract in excess in relation to the needs are not stored, but they fall apart quite quickly, m.in. for very toxic substances for the body. The "nitrogen residue" tries to remove the urine, and organic acids serve as a direct source of energy or are used differently by the body or excreted.
Many authors pointing to the waste of such a used protein, used as an energy substrate, states, that excess protein supplied, especially animal, is a serious burden on the metabolism of nitrogen compounds (amino acids, puryn i in.) the consequences of which may be indifferent to human health.