As far as I can see, we humans are natural omnivores. As hunter-gatherers with more brain than brawn, we ate whatever there was - and because of this, we settled just about every habitat under the sun. There are very healthy traditional cultures that are vegetarian, and vegan, and almost exclusively carnivorous. (None that live on processed junk, though, afaik...) We can pick our chosen traditional culture and 'prove' that the 'best' diet is any one of these. Or we can just follow our own intuition and conscience.
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