Health wise I'm not sure but as far as meat being natural it's pretty solid.
There is excellent evidence of 1.5 million year old hominid butchering and marrow-processing activities at two different sites in Africa. This would have probably been Homo Erectus.
H. Erectus was also the first hominid to have a much larger brain as a result of increased protein/fat. This was the first Hominid to wander all over the globe and the first systematic hunter.
There were a few other species that came from them but most died out. The one that lived was us, homo sapien. Erectus was able to survive in many places, the plains dwellers and other inhospitable regions must have given rise to daily hunting.
I noticed vegetarian websites usually reference our herbivore ancestors from 4-5 million years ago but skip over newer apes archeology has found.
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