of course, the brain post-rationalizes and draws up new connections, so on the surface it wasn't as simple as "high calorie, do not want". not that I'm saying there aren't good reasons to go vegan (there are plenty), but when the *entirety* of a demographic is vegan, it's sus.
more than just believing that eating animal products is wrong, the disordered brain warps "right/wrong" into "clean/dirty". I witnessed this happening to myself first-hand — before I even consciously decided to go vegan, I started feeling "gross" when eating animal products.