Did the human diet evolve?
a couple of days ago I was speaking with some vegans who were explaining something to me that was rather interesting. They said that humans never actually ate meat in our more primal stages of life. Rather we ate more like a chimpanzee, from fruits, vegetables (possibly ants) and water. It was only until later when humans began trading meat there was a profitable market and thus we have Mcdonalds and other meat industries. They further went on by saying that our teeth is the greatest evidence of this as our teeth do not have large fangs like a lion or wolf or other predatory animals. When I attempted to mention that apes actually do have long fangs (Or canines), they simply stated that because apes don't eat meat, humans evolved to which we wouldn't need fangs, which is why our teeth look like so today. So, by humans eating meat we are counter-evolving or going against our natural diet.
So here's my questions
Was meat ever in our human diet in earlier days of life?
Is it true the reason our teeth do not resembles fangs of a predator is because we actually are not meat eaters?
IF humans never did eat meat before, does that mean we have evolved to eat meat? Or is it simply just a bad diet we are taking upon ourselves?
I just want to find some truth about this. Thanks :]