Proteins are the Amino acids necessary to provide the strength to our muscles. Hair and nails are mostly made of protein. Our body uses protein to build and repair tissues. Protein is an important building block of bones, muscles, cartilage, skin and blood. The beauty of the proteins is that the excess proteins will not be stored unlike that of fat and carbohydrates. However, excess consumption of the Proteins is not desirable.
A general view of the nutritionists is that our body needs less than 1.5 Gms per Kg. of our body weight. However, please consult your Doctor to know about appropriate requirements based on your health condition and body type.