Hello willace. Since when does the human body need protein for proper growth? It needs amino acids, which are the building blocks of cells, found all throughout the plant world. In no way, and I'm saying this not to start an argument, does the human body need anything from an animal. Nothing. Everything it needs is found within fruits and veggies leaning on the fruit side. By the way, I have no issues at all with people eating meat. I've just found my body functions better, feels much better and all issues I've battled with have gone away through changing my diet. It works for me, hell I don't even get sick anymore but I digress.................