[somedudetbh]

A lot. for example: jainism, zen buddhism (shōjin ryōri), rastafarianism. There are also a lot of religious practices where the religious doctrine doesn't _require_ adherence to a vegan diet, but not eating animal products is considered more holy, and specifically because of the abnegation aspect the post is talking about. Catholics, for instance, have a long and complicated tradition of avoiding animal products for religious reasons: https://en.wikipedia.org/wiki/Fasting_and_abstinence_in_the_...