we are not physically designed to eat meat...
we are bipeds and therefore cannot chase down animals very easily, we dont have good long fangs, like other meat eating animals, or have strong ripping claws, we also have very long intestines, like herbivores, carnivores have short ones so the meat passes throygh quicker and does not go rancid at temperatures in the stomach..we also cannot stomach raw meat like carnivores
we only eat meat because we became intelligent enough to invent ways and tools to help us do it...without that intelligence and without skills or tools we would not be able to sustain a carnivorous lifestyle...