It is pretty human and natural. Just a choice. You have to eat correctly even if you eat meat. Most people just eat your average veggie fare and forego the ones that actually provide the nutrients you need. BEANS!!! Eat lots of them
My dad has been a vegetarian for over 40 years. He is 71 and still works and hikes all over the place. The Docs say that he is healthier than some 40 year olds.
I still eat meat by choice.
Just do not be stupid and you can make it work. I was one for 7 years and never got sick or unhealthy.