Whey protein is popular among athletes today because of its ability to be digested very rapidly and help return the post-workout body back from a catabolic (muscle- wasting ) state to an anabolic (muscle- building ) state. [ medical citation needed ] Whey protein isolates are also widely used in infant formula to provide a natural source of amino acids for optimal growth and development, as well as for protein fortification of bars, beverages, dairy products, extruded snacks and cereals and other food product.
All proteins are comprised of amino acids, and amino acids serve as the building blocks of proteins. Each protein, regardless of its source, is made up of approximately 20 amino acids. Since all proteins are comprised of the same 20 amino acids, how is one protein source different from another? The answer to this question is that the sequence of the amino acids differs from one type of protein to another. In addition, the composition of the amino acids that comprise a given protein is what makes one type of protein different from another. For example, soy does not have as much of the amino acid methionine as some other high-quality proteins, and egg protein has more branched chain amino acids than vegetable proteins.
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