Turn the pyramid upside down, and it is closer to the truth. Humans are mostly carnivorous. However, we do have molars and can get some nutrition from leafy greens and fruits. What we were NOT designed to eat are grains. We don't have seven stomachs, or a craw to break down cellulose. We also have relatively weak enamel on our teeth, which is perfectly fine for ripping and tearing meat, or eating soft veggies and fruits. The biggest detriment to human health has been processed sugars and transfats. Simple carbs are not good for you.