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By John McArdle, Ph.D.:
I really like this part: "They are basically *opportunistic* feeders (survive by eating what is available) with more generalized anatomical and physiological traits, especially the dentition (teeth). All the available evidence indicates that the natural human diet is omnivorous and would include meat. We are not, however, required to consume animal protein. We have a choice."
However, I tend to believe we only have a choice as a "whole" (humans), individually speaking, some are more adapt to these or those (carnivores, herbivores, frugivores, etc.) and a counter account: ecologos.org/mcardle.htm