“I do not intend to enter into any lengthy discussion of comparative anatomy and physiology at this place, but will content myself with saying that every anatomical, physiological and embryo-logical feature of man definitely places him in the class of frugivore. The number and structure of his teeth, the length and structure of his digestive tract, the position of his eyes, the character of his nails, the functions of his skin, the character of his saliva, the relative size of his liver, the number and position of the milk glands, the position and structure of the sexual organs, the character of the human placenta and many other factors all bear witness to the fact that man is constitutionally a frugivore. As there are no pure frugivores, all frugivores eating freely of green leaves and other parts of plants, man may, also, without violating his constitutional nature, partake of green plants. These parts of plants possess certain advantages, as has been previously pointed out, in which fruits are deficient. Actual tests have shown that the addition of green vegetables to the fruit and nut diet improves the diet.” - Herbert M. Shelton
