Representing nearly 50% of the dry weight of our bodies, proteins are nutrients formed from a series of amino-acids the linkage of which is determined by our genes. They help to form, renew and repair a large quantity of our cells and tissue (muscles, bone, skin, etc.).
Of the 20 amino-acids which make up our proteins, some are directly synthesised by our body while others, known as "essential amino-acids", can only be obtained via our diet.
The main sources of dietary protein are animal products, cereals and pulses. However, the quantity and quality of protein from these foodstuffs are very variable. When our diet is particularly unbalanced or in certain circumstances (seniors, athletes, etc.) a protein supplement may become necessary for the proper functioning of our cells and body.