Earlier quoted context omitted.
> It's fine, however, to eat nothing but meat and many societies did this for hundreds of thousands of years. Other than those who live in the arctic, which societies did this? You have sources? Thanks!
I think it's false. Hunter gatherer communities (no societies back there) lived by what they could find - either hunt animals or look for fruits, plants and mushrooms. Then there was a shift towards agricultural societies, where people relied on their plantations and domesticated cattle. I don't think the cattle meat would be enough for most of their meals, probably the most of them would be bread and soup. This is j…
But in general, I think we know a lot less about the lives of people so long ago than many people (including academics) like to think. Research methods are often based on either assuming modern people's lifestyles are "just like" ancient people, or big leaps from extremely limited archeological evidence.