The enzymes that regulate chemical reactions in the body are proteins. Sources There are 20 different kinds of amino acids. Non essential amino acids are those which may be synthesized by the body. Essential amino acids cannot be produced by the body and must be ingested in foods. Complete proteins contain all the essential amino acids required for the growth and repair of bodily tissue.
Incomplete proteins lack one or more of the essential amino acids.
The best source of complete proteins are eggs, milk, meat, poultry and fish. The supplement industry advocates high protein consumption for muscle building. However, any excess protein consumed in the diet or through supplementation is broken down for energy or stored as body fat. It is important to remember that exercise is the key for stimulating growth of new muscle tissue. Protein only supplies the materials.