Stable isotope studies indicate that humans historically consumed diets similar to known carnivores.

“these stable isotope studies that mike eads has talked about and you can see the in them they do have you know graphics looking at carbon and this is i believe a um i think that s is a strontium isotope oh it's a sulfur isotope and you can see where humans end up and we end up pretty high around known carnivores and then another one you can see here these are pretty common with these similar ideas with isotopic data from carnivores and neanderthals and modern humans delta d13c d15 nitrogen”