Check out this PDF file which lists the protein efficiency ratio, biological value, amino acid score and digestibility of various protein sources. As you will see whey, milk and egg proteins are great quality sources. A lot of people take whey protein early in the morning and pre/post workout as it digests very quickly and gets amino acids to the muscles fast. During other times it's good to have a sustained release so your nitrogen balance remains positive for many hours. Overall I'd say it's good to have both whey and blended proteins (e.g. casein, egg and whey) on hand. Although protein shakes are great they only supplement your protein requirements, they should not be the main source.



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