TIL A 1.5 million year old skull of a two year old child (probably Homo erectus) showed it suffered from severe anemia due to lack of meat in its or its mother's diet. Our ancestors depended on meat that long ago for Vitamin B12 and Folic Acid. Hunting is an old behaviour. User truthinresearch, in the Today I Learned (TIL) subreddit, 23 Nov 2013
Humans evolved eating meat! (X post from r/science) User 3kixintehead, in the paleo: the official subreddit for the paleo diet subreddit, 09 Oct 2012
Discovery highlights that by at least 1.5 million years ago early human physiology was already adapted to a diet that included the regular consumption of meat User hot_coffee, in the Reddit Science subreddit, 08 Oct 2012
Meat consumption in homonins earlier than previously thought User heidavey, in the Evolution subreddit, 04 Oct 2012