Meat
The meat of our ancestors Writing in the NYT (21 October 2003), John Wilford refers to 2.6 mya bones from wildebeests and zebras that show scratch marks consistent with butchering by humans (Australopithecus garhi).
References
John Wilford, New York Times (21 October 2003) New clue on which came first,
tools or better diets
Evfit home Back to food On to fish On to vegetarianism page for a comparison of human omnivory and human herbivory