Question: What will be the food of the united people?

Answer: As humanity progresses, meat will be used less and less, for the teeth of man are not carnivorous. For example, the lion is endowed with carnivorous teeth, which are intended for meat, and if meat be not found, the lion starves. The lion cannot graze; its teeth are of different shape. The digestive system of the lion is such that it cannot receive nourishment save through meat. The eagle has a crooked beak, the lower part shorter than the upper. It cannot pick up grain; it cannot graze; therefore, it is compelled to partake of  meat. The domestic animals have herbivorous teeth formed to cut grass, which is their fodder. The human teeth, the molars, are formed to grind grain. The front teeth, the incisors, are for fruits, etc. It is, therefore, quite apparent according to the implements for eating that man’s food is intended to be grain and not meat. When mankind is more fully developed, the eating of meat will gradually cease.

8 June 1912

(Abdu’l-Baha, The Promulgation of Universal Peace, p. 170)