Yeah but that sentence does not refer to why the person switched to being vegan, the first one does. In any case, let us not beat the dead horse there. :P Supplement B12 and it is fine.
No sentence referred to why they became vegan. Their nutrient numbers improved when they became vegan. This happened because becoming vegan moved them from a group who didn't know they needed supplements to a group who knew they needed supplements.
> In any case, let us not beat the dead horse there.