"Veganism", per se, is an ethical movement, has nothing to do with eating healthy. Even then, it used to be vegans on average weighed less than your average American, but now... I'm not sure. I was at a vegan get together this past weekend, and of about 30 people, I'd say 5 (including my wife and I) didn't at least have potbellies. There were even a couple of certified lardbarges into the "I'll be immobile soon" range.