Human Beings are Frugivores by dietary species classification meaning that we are physiologically, anatomically and biologically not carnivores, omnivores or herbivores. Our jaw structure, intestines and visceral organs are perfectly designed to digest and metabolize fruits, vegetables, herbs, nuts and seeds. We have certainly become omnivores by habit and cultural adaptation / preference but archaeological evidence has shown that the human digestive system has not changed / evolved at all for hundreds of thousands of years. The theory that was historically Hunters is exactly that, a theory, and is largely unproven.
Most tools and weapons found in archaeological digs are found to have actually been used more for foraging, cutting fruits and vegetables, for self-defence and not for hunting as is typically imagined even though hunting was an occasional ceremonial practice. Therefore, because fruits and vegetables are perfectly suited to our anatomy and physiology eating exclusively organic fruits and vegetables is the safest way we can be eating.