Seventeen years ago I went veggie, sixteen years ago I went vegan. So almost half my married life. In my case it was a choice based on logic... I figured if I couldn't find it in me to kill an animal then it was wrong to eat it. That's me though, not everyone else. Also, being pregnant really put me off milk... something about eating another mother's milk when you're lactating for your own baby struck me as really obscene.