"normal" "average" same shit dude.
either way I dont know of any study, but I can tell you that if I take in 50g shake or more, I shit my brains out like 10 minutes later. On the other hand if I take in 50g of chicken, I can barely move after, and it doesnt have the same effect as whey. from that alone i would say it depends on the type of protien, and the situation in which your eating it in.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.