Answer: Unsurprisingly, chimpanzees consume an entirely raw food diet. The famous ethnologist, Jane Goodall, gave these overall percentages when discussing their eating habits in her book, The Chimpanzees of Gombe: Patterns of Behavior.
The chimpanzee is largely a fruit eater, and enjoys an overall diet that is 95% composed of raw, whole, and plant-based food. Their diet is occasionally supplemented by insects (such as termites) and other meat.
Since human beings and chimpanzees share so many anatomical, physiological, and biochemical traits as well as a very similar genome close to 99% of the coding DNA sequences almost identical for both species, this does suggest modern people should also be enjoying a largely plant-based diet with lots of whole, raw food as well.