> I'd also say we're not evolved for purely vegetable eating how come I can get all my necessary nutrients from it so? > This is one reason our brains expande

> I'd also say we're not evolved for purely vegetable eating how come I can get all my necessary nutrients from it so? > This is one reason our brains expanded, because we gained access to richer foods like cooked meat with fat, which in turn supported more brain cognition. This also is interesting, it's definitely possible that at this time humans didn't have access to enough vegetable, it was pretty cold 1-2 million years ago, people like inuits obviously don't eat much plant-based food. Fire was an important step (for creating warmth at least), for cooking see this https://www.scientificamerican.com/article/food-for-thought-was-cooking-a-pivotal-step-in-human-evolution/ https://www.scientificamerican.com/article/food-for-thought-... which puts things more in relief In brief, you're putting 2 confounding factors together: brain size expansion and cooked meat. It's very likely that our environment challenges forced us to adapt and get more intelligent, but the causal effect you're saying is not true, just like any logical implication can't be reversed It's also fun because you are also implying "you'll be more clever by eating meat than vegetables" which is also wrong nowadays, just because we can't compare a situation that happened 1 million years ago in a different context.