I ate a vegan diet for about six months. It was a lot of fun to see what can be done with tofu, temphe, etc.
The only odd thing about it is that after switching back to a more standard diet, I was lactose intolerant (definitely NOT an issue I had before). Cheese on a hamburger or a taco won't cause my any problems, but eating a piece of pizza with lots of hot, melted cheese (or drinking milk / eating ice cream) causes great pain.
No major issue -- I prefer rice ice cream to most regular ice creams .. just surprising to have that happened.
I was just about to reply to this thread and say you are crazy for going veggie because your body needs meat and you will slowly become ill without it but this post proves my point. THe body needs protein. You get sick without it. Be normal.