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I would dispute the description of early humans as 'herbivores'.
Virtually ALL primates are omnivores. Small ones eat large insects, medium sized ones eat lizards, big ones will catch what they can, and any of them (with a very small number of exceptions) will take birds eggs and nestlings if they find them.
When proto-humans left the trees, came out onto the plains, and stood upright, readily digestible plant matter became less available (grass isn't really digestible to a primate) and the strong probability is that at this stage humanoids started eating more meat, simply because it was less effort for the available nutrition.
There is some evidence to suggest that the development of the brain occurred at mugh the same time (well before control of fire), and some therefore believe that the extra protein was a trigger to its development. We will never know for sure whether this was the way, or whether the ability to co-operate in hunting required a bit more cleverness than previously. Chimps (which do hunt) are generally reckoned to be more intelligent than Gorillas (which don't, but still eat eggs if they find them). Baboons are probably among the most intelligent of the monkeys (as opposed to apes, which have a head start), and they hunt, work in teams and live on the grass-plains.
Most meat-eaters do eat far more meat than is reasonable, and it is bad for the planet, but there IS a findable balance.
Milk-based products are about as unnatural as you can get without massive processing.....
Flowers come in too many colours to see the world in black-and-white.
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