A lot of people who are vegan for years end up with health problems. It isn't talked about enough. Especially if you are trying to be even more extreme--like a super low-fat diet or raw foods--the outcomes aren't good. I think vegans have their hearts in the right place but there is a lot of evidence that we evolved on meat, and zero evidence of any naturally occurring vegan cultures. Even in the Blue Zones, where legumes and rice are big, people eat fish and sometimes meat.