Well, dogs are essentially mainly carnivores...you can tell that by looking at their teeth. Human beings aren't. They absolutely aren't. You can tell that by looking at their teeth. Human beings have teeth that are clearly designed by Nature to chop and crush vegetation and fruits, not inflict puncture wounds and rip out the throat or abdomen of their prey.

(some) People in ancient times got into eating meat in a big way because they were clever enough to learn how to use handheld weapons, thus making themselves very capable carnivores, and it was a quick, handy, exciting way of securing a lot of food fast...whereas growing plants and picking berries, etc. is a slow and not very exciting business.

Those people were also very good at killing OTHER people, so it's not surprising that meat-eating humans began to make their influence very strongly felt in primitive times. Meat-eating is basically the lifestyle of killers, because it always involves killing...either directly or by proxy.

Some human societies began to associate the eating of a lot of meat with being rich and successful...thus it became the ideal of all the poor people to live a life where they got to eat meat every day, and the more meat the better! That led to the North American lifestyle, where people now eat so goddamn much more meat than they need or that their bodies can handle that they are dying at record rates from heart disease and other degenerative ailments caused by their meat, sugar, and starch-centered diet. Plus, there's an epidemic of obesity, mostly due to that cruddy diet...and lack of exercise.

If she's a Vegan, she's living more naturally and healthfully than most people in this culture do.

p.s. I'm not a Vegan. I still eat more meat than I probably should, because I'm basically lazy, I'm accustomed to doing so, and it's convenient to do so. I am a product of the culture I was born in...but I'm very aware of it too, and of various possible alternatives.