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Not to mention that the same proteins form enzymes without which we could not live. They are made up of subunits, called amino acids (AA). Some of these are essential for protein synthesis and for this reason they are defined as proteogenic.
Some of these can be produced by the organism, while the others must necessarily be assumed through the diet. The first are called non-essential amino acids, while the second essential amino acids (AAE). A micro-category of AA is called conditionally or limitedly essential, because it possesses this characteristic only in certain age groups or in paraphysiological or pathological conditions.
For the body to synthesize proteins, all amino acids must be present; the lack or reduction of even one is a limiting factor.
Proteins that contain all essential amino acids in the right quantities and proportions (such as human ones) are said to have a high biological value (VB), while proteins that lack one or more essential amino acids are called incomplete (medium or low) VB. It indicates how effectively they are used by our body; "scientifically" we could say that the VB represents the ratio between retained nitrogen and nitrogen expelled from our organism for maintenance and / or growth.
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These play a very important role if it is not possible, with food alone, to reach the desired protein quantity. They can also represent a good quick and tasty alternative to the ordinary meal (chicken breast, natural tuna, egg white, light cottage cheese, etc.).
They play a fundamental role in the post workout, when trained muscles urgently need nutrients for rebuilding. Many manufacturers claim that the proteins contained in supplements are more easily metabolized than those derived from food. There is no study that confirms this thesis, the only difference between dietary and protein proteins is only the absorption time which is in favor of the supplement.
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