There are three global reasons one can decide to be vegan, vegetarian, and reducetarian. 1) Animal well-being. 2) Environmental well-being. 3) Personal healt

There are three global reasons one can decide to be vegan, vegetarian, and reducetarian. 1) Animal well-being. 2) Environmental well-being. 3) Personal health well-being. You may substitute well-being with suffering, and there's also a nuance between death and staying alive but using (e.g. milking). [EDIT: I suppose there's a fourth, a psychological reason how some people find certain products 'impure' to eat. But I'm not sure how I'd define that group.]