/ck/ - Food & Cooking

Its biology, when you eat a herbivore you get more energy and nutrition because they get a lot of energy from the plants they eat. Whereas a carnivore gets less of that energy because it has gone through a middleman. But the reason we don't exclusively eat vegetals is that eating meat is more efficient and we get 85-95% of the energy from the meat.
Also because of generations of artificial selection, it makes more sense to eat our generic farm animals than an animal that we haven't selected to be tasty.