People used to believe that eating fat makes you fat, and eating sugar makes you sweet (okay, the latter is maybe an exaggeration), because it seemed so obvious

People used to believe that eating fat makes you fat, and eating sugar makes you sweet (okay, the latter is maybe an exaggeration), because it seemed so obvious. Later they realized that actually eating lots of sugar makes you fat. That's progress. The sugar producers want you to believe the old version; they love to emphasise how "low-fat" their heaps of sugar are. (Every time you read "low-fat", translate it mentally to "contains lots of sugar". Every time you read "low-sugar", translate it mentally to "contains lots of artificial sweeteners". Hint: the actually healthy stuff, such as fruit and vegetables, doesn't need to protest too much.) Education about this part is a good thing. On the other hand, removing vegetables from diet goes completely against the currect best knowledge. You should eat a lot of vegetables, preferably raw. Like, okay, you can cook your broccoli; but then eat some other raw vegetable, and some fruit (uncooked, without extra sugar). -- However, I have never heard Peterson recommend removing vegetables as a general advice for others; it was always in context of finding out what works for his autoimmune disorder, because the standard medicine didn't help him much, so he experimented with crazy things. So, these are two different things. One is highly controversial, the other not at all.