'Comparative anatomy works on the simple and demonstrable fact that the biological form usually defines function. Individual features, or species may break the rules, but a look at many factors will reveal a species true biological role. Certainly Science does not really validate the typical vegan diet, as this serves cultural imperitives. Science provides us with an indicator of human nutrition which was not established by culture, but is certainly that of a herbivore or frugivore and not a carnivore or omnivore..'