protein shakes are processed dairy.. that is all it is
i have tried the protein shake thing over the years and i always feel bloated and like ass. so i simply do not drink them. the only thing i drink is a high quality and low calorie greens powder for breakfast. that is it.
you don't NEED protein shakes. that is something the supp companies have pushed ever since Weider had the idea to stick arnolds face on a tub back in the 80's
i would much rather you eat a balanced diet and take a supplement like hcgenerate or creatine (n2bm sells them) which won't tear up your stomach and actually work