I just referenced a study found in medical journals that show how protein shakes can in fact be "bad" for you as opposed to eating real food. Obviously, the conlcusion is that substituting protein powder for real food can't be something beneficial, according to that study. If you are so keen on finding this answer, then research it yourself and read LOL You want everyone else to show you studies, why can't you go read them on your own?
But here, let me help you. Don't forget to click on the Scholarly Articles link
http://lmgtfy.com/?q=medical+journal...in+supplements