Fat, Not Meat, May Have Led to Bigger Hominin Brains
One of the first human foods was actually bone marrow which is basically pure fat.This happened about 2MYA by Homo habilis who figured out that you could use rocks to bust open bones.Lions and Hyenas would leave huge piles of bones in the middle of the dessert which had been picked clean by vultures.One of our ancestors had the brilliant idea to use a rock to bust open the bones.Well it's a massive source of free calories.  It's absolutely brilliant.  It's just sitting there and there are no other predators or species around to fight with at that point.It's also very safe to eat even days after since the marrow is wrapped in bone.Next time you're out at a fancy restaurant and they have bone marrow GET IT...Then realize you're eating one of the first foods that modern man ate and think of the gift he gave us.