I was a model vegetarian! I ate whole vegetarian foods, minimally processed. With strict adherence to a plant-based diet, I developed obesity, diabetes, severe arthritis, high cholesterol, constant lethargy, Hashimoto's and several other autoimmune disorders. It was great! I was so proud of the fact that I was eating like the apes, my ancestors.
How did I decide to take the other side in the herbivore/omnivore debate? Dogs and arrowheads convinced me that it was in my evolutionary nature to eat meat. Dogs because, as "man's best friend," they show that man's companion animal was the carnivorous wolf; symbiotic eating relationships exist throughout nature, like smaller carnivores watching vultures to locate prey and then tear it apart for the vultures. Arrowheads (and other hunting implements) because it would be pointless for mankind to develop a whole technology for hunting if meat-eating was not the object.
I don't need to settle the debate. My regained health settles it for me. My doctor wishes that her other sick patients would agree to eat like I do and regain their health, as I have.