I was vegetarian for maybe two, or two and a half years, with a nine month vegan stint in there. It was for moral reasons - I believe that animal suffering is, well, bad. I had to go vegan because it was the logical extension of vegetarianism (since animals also suffer in egg and milk production). But one day I sort of just... stopped. In a sense I'm morally bankrupt - I never really changed my mind, philosophically speaking. My return from veganism to vegetarianism was based on the fact that I was no longer convinced that a vegan diet is particularly healthy. I know mine wasn't. Actually, I lost a lot of weight, and don't have much to lose in the first place. These days I am skeptical of any assertion about nutrition one way or the other... I always remember people asking me what I ate, with an incredulous tone, as though being vegan or vegetarian meant that you basically starved. In reality, my diet became much more varied as a result of the change.