After her indoctrination at UC Berkeley my sister went vegan, typical vegan demanding animals rights and 'you should because I do' rhetoric. Less than a decade into her life, planet, children and animal saving lifestyle her doctor told her emaciated little arse "you better eat some meat or you're going to die".
Going back at least 3 generations I know of personally we've all been meat eaters on both sides. Going vegan because it works for someone is great, going vegan to serve an agenda is IMO most prevalent.
Might want to take a look at your motive(s).