I think that it is possible to get a good athlete's diet while being a vegetarian who consumes milk or eggs, but people are rightly suspicious about the claims of vegans. From what I've heard, many ex-vegans are shunned by their friends if they admit to eating meat. In fact, some nut had a web-site devoted to attacking people who used to be vegan and gave it up. A lot of the women who strip down for those PETA ads are seen eating steaks and the like in public. For many people, vegan is a pose to show how much better they are than other people. And some people like Carl Lewis switched over very late in their careers while they had grown up eating animal protein and fats.