The Digestive Canal
By observation of the digestive canal we find that the intestines of carnivorous animals are 3 to 5 times the length of their body, measuring from the mouth to the rectum; and their stomach is almost spherical. The bowels of the herbivorous are up to 28 times the length of their body and their stomach is more extended and have multiple sections. But the bowels of the frugivorous animals are 10 to 12 times the length of their body; their stomach is somewhat broader than that of the carnivorous and has a continuation in the duodenum serving the purpose of a second stomach. This is exactly the formation we find in humans which again leads me to believe that the human body is made to eat a frugivorous diet.
Observing the Reaction to Food
By observation the reaction to food, we find that when the carnivorous animal finds prey, he becomes so excited that his eyes begin to sparkle; he boldly seizes the prey and kills it, hungrily lapping the blood of its victim On the contrary, if the food of the herbivorous animal is sprinkled with even a little blood he will refuse it, leaving it untouched. His senses of smell and sight lead him to select grasses and other herbs for his food, which he tastes with delight. Similarly with the frugivorous animals, we find that their senses always direct them to fruits of the trees and field. In humans we find that their senses of smell, sound, and sight never lead them to slaughter animals; on the contrary most cannot bear even the sight of such killings.