[lolinder]

TFA doesn't claim that early humans didn't eat meat, they claim that they ate everything. The key claim in the article is that the diversity of food is what is lacking in modern diets, rather than absence of any single large nutrient group. I see nothing in TFA's claims that are incompatible with humans hunting animals and digesting meat more than other primates.

Also, I would not take that paper at face value without a lot of other literature around it. Two out of three authors make money writing about the Paleo diet, and they're explicitly proposing a new interpretation of the evidence, it's not a literature review representing any kind of consensus.