I've been reading about vegan because I've never heared about that.
It has been interesting to know about that, it is not only a way of eating but also a way of live.
You can find everything about that at http://www.vegan.org/index.html
I really recomend you to visit that page. it is not necessary to share their point of view but it is interesting to know how they feel and how they afford that kind of live.