and DIETETICS.
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The proteins are composed of amino acids, 8 of which are known as essential since they cannot be synthesised by the body.
They must be obtained from food
(isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine).

Protein intake is vital for growth then for maintaining the lean body mass in adults. Although proteins generate 4 kcal/g, their role is not to supply energy.

The average protein requirement for healthy adults in normal physical activity is 0.75 g/kg/d.
For the endurance athlete, the protein intake must be 1.6 g/kg/d;
for a strength athlete , it must be 1.2 g/kg/d.

Note that above 2 g/kg/d of proteins, the protein excess is not assimilated and is therefore wasted since it is directly eliminated in the urine (this additional work imposed on the kidneys may cause serious renal pathologies).

The average protein intake must represent 15 % of the daily ration.

The protein intake must remain rational and not give way to the numerous rumours that athletes are often tempted to believe (for example: meat has "toxic" effects or eating meat helps you to build up muscle, etc.).
100 g of meat = (20 g of proteins)
130 g of fish
120 g of seafood
2 eggs
2 slices of ham
500 g mussels in their shells
20 oysters
100 g of natural tuna

100 g of white cream cheese = (10 g of proteins)
30 g of dry cheese
200 ml of milk
20 g of powdered skimmed milk