Our bodies and digestive systems are designed to adequately break down plant material with a couple of exceptions like grass or tree bark. Our molars are flat to grind up what we eat, much like a horses teeth are. Our front teeth are flat and have a sharp edge in order to cut out 'chunks of apple' or clip off bits of plant material, much like a horses front teeth are. A carnivorous animal on the other hand, has actual canines that are extremely long and their back teeth work with a scissor like action in order to slice off chunks of flesh. Our digestive tract consists of a long intestine which is necessary for the breakdown of plant materials, unlike the carnivore whose stomach takes of the majority of the digestive tract with a resulting short intestine. Our saliva also contains a carbohydrate digesting enzyme which facilitates the digestion of plant foods, while a carnivores doesn't. As well, our stomachs are slightly less acidic than a carnivore who must breakdown meat for the most part in the stomach (as they do not chew their food).

The other interesting difference between us and dogs and cats and other predators is the structure of the jaw. We used to have a longer jaw that provided enough room for all of our molars but as we have evolved, that jaw has shortened and that explains the problems that we invariably have with the wisdom teeth that come in at the back. While we have a shorter jaw, we haven't quit 'growing' those teeth. Our jaws are designed to move from side to side to grind up the plant material that we eat, whereas a dog cannot and as well, the muscles on the side of their jaws are significantly larger to facilitate the ripping and slicing action that is necessary to obtain their food. They can also open their mouths far wider than we can so that they can tear off the large chunks of flesh that go into their oversize stomach. By comparison, we are forced, by design, to eat smaller bites of food and we choke easily unlike dogs.

The spacing of our teeth also indicates the type of food that we are designed to eat. Carnivores have pointy teeth that prevents 'stringy' tissue from getting caught in it. Our teeth on the other hand , if we have normal, healthy oral structure, are very close together which is why humans frequently are forced to use a toothpick to pick that same stringy tissue out of them.

Interestingly, black and grizzy bears which are true omnivores also demonstrate a carnivorous structure which the exception of flattened molars.