All fine and good, Mrs. C., but realize too that we developed as omnivores FROM being herbivores as Homininae were. Herbivores are hunter gatherers and over time as tool development began, axes, spears and such which extended the range from which we could kill prey, that then ALLOWED us to begin hunting game, larger and larger game, which freed up time for us to start developing culture, homes, etc., while the added protein facilitated brain development along with the emergence of genes like microcephalin and others influencing brain growth which, in hand with improved tool-making, set the pattern for societal growth--- the point being that our becoming omnivores was a gradual transition over a very long period of time driven largely by environment and other factors more so than anything endemic to us, meaning that the reverse could also be true and mankind could just as easily slowly evolve back into a pure herbivore, and as such, given time, even our teeth and digestive track would eventually follow suit.