Humans, as we were evolving, ate primarily foraged fruits and vegetables with meat thrown in when available. This is why most of our teeth are flat. We have canines, but humans in prehistory weren't eating meat 3x a day every day. Our digestive system isn't able to handle as much meat as the SAD contains. We can't even eat raw meat, unlike all natural carnivores. To think that our teeth are able to "efficiently and quickly tear apart meat" is ridiculous. Have you tried eating a raw steak recently?
One of the most common justifications for eating animals that vegans encounter is, “If I wasn’t meant to eat meat, then I wouldn’t have these canine teeth!” It’s a knee-jerk defense that’s often made after a meat-eater has been confronted with information about the routine cruelties of animal farming, or with the fact that humans have no biological need to consume meat, milk or eggs.
But there are several serious problems with the “canine teeth” argument, the most glaring one being the premise that “the presence of canine teeth = meant to eat meat.” In truth, with the exception of rodents, rabbits, and pikas, nearly all mammals have canine teeth. In fact, several herbivores and primary plant-eaters have ferocious canine teeth, and, as you’ll see in the gallery below, the largest canine teeth of any land animal belong to a true herbivore.
Geladas are the only primates who primarily eat grass – grass blades make up to 90% of their diet. The rest consists of flowers, rhizomes, roots, herbs, small plants, fruits, creepers, bushes and thistles. Insects may be eaten, but only rarely. Geladas use their sharp, two-inch canines to attack rivals or potential predators.
Say hello to my little friend: the saber-toothed deer. You read that right — it’s not photoshop, it’s just a tiny deer with giant fangs! Musk deer, as they’re officially known, are herbivores who live in the forested mountains of Southern Asia. They’re around 2 feet tall, weigh between 15 and 37 pounds, and the males’ elongated canine teeth form saber-like tusks which they use in territorial disputes, or when competing for mates. So what kind of food do musk deer tear into with those vicious canines? The menu is a virtual gore fest: leaves, flowers, grasses, mosses and lichens.
Gorillas are almost exclusively herbivorous. Mountain gorillas prefer a diet of foliage — leaves, stems, pith, and shoots — and a small amount of fruit. Lowland gorillas also eat leaves and pith, but they eat more fruits, and, occasionally, tiny ants or termites. Gorillas’ giant canines have nothing to do with eating meat.
Not only do most mammals, including herbivores, have canine teeth; but the largest canine teeth of any land mammal belong to a true herbivore: the hippopotamus. Hippos are extremely territorial and aggressive; their sword-like canines, which can reach a terrifying sixteen inches in length, are used for combat and play no role in feeding. The hippo’s diet consists of grass, on which it grazes at dusk.