[Hugin]

The original human diet would have been plants, insects and lots of meat. Before humans hunted they would have scavanged. Especially they would have broken open the bones of large animals for marrow.

[shuckmaster]

The original human diet would have been plants, insects and lots of meat.

The ape/human digestive system is evolved for a vegetarian diet. Meat was added later and the addition of protein to the diet probably added to the eventual increase in brain size.