Milk contains two kinds of proteins: whey and casein. The amino acids in whey protein are absorbed to the bloodstream quickly and therefore effectively available for muscles.
Protein for building up muscles
Nine of the 20 amino acids present in the proteins of a human body are what are referred to as essential amino acids, which we must get from food, since the body cannot produce them itself. The most important job of amino acids in the body is to act in the structural proteins of muscles and other tissues. Branched-chain amino acids – leucine, isoleucine and valine – make up a significant portion of the amino acids in muscle tissue. An adequate intake of proteins in your diet contributes to the growth and maintenance of muscle mass as part of a balanced and varied diet and a healthy lifestyle.
Amino acids in whey protein
Whey proteins are not denatured in the acidic conditions of the stomach, but are rapidly passed into the small intestine where they are degraded, absorbed and delivered to muscles and other tissues. Casein, on the other hand, forms a clot in the stomach and is released more slowly. Of the protein sources in nutrition, whey protein has the highest concentration of branched-chain amino acids, such as leucine.