If you have any annoying friends who follow the Paleo lifestyle (it's a lifestyle, NOT a diet), they'll gladly regale you with tales of how humans are biologically designed to be carnivores, how this way of eating totally fuels their WODs and Murphs, and how hunter-gatherers were healthier than today's sitter-eaters, even though they had to dodge things like unpredictable weather, hungry saber-toothed tigers, and a lack of medicine.
Still, the logic appeals to a certain everyman common sense: After all, what did our prehistoric ancestors eat if not for animal meat, animal fat, and broth made from (yes, animal) bones?
Turns out, mostly plants.
Hunting for berries and gathering greens isn't as exciting as trudging through the elements to take down a wooly mammoth, but it's probably a more realistic picture of what our Paleo ancestors were doing for food. A 780,000-year-old collection of edible plants found in Israel points to a more plant-based diet for humans at the time.