I'm vegan. Used to be pescatarian--a person who eats only vegetables, dairy, and seafood.
If you're interested, check out Forks Over Knives. All about the health effects of eating animal proteins.
The China Study by T. Colin Campbell is another good read. A lot of people read the book and decide to become vegan.
Mad Cowboy by Howard Lyman is also interesting. He came from several generations of cattle ranchers--he is now a vegan, and was president of a vegetarian union. He goes into the dirty secrets of cattle ranching and really hits heavily on prion disease. In 1996 he was on Oprah and they both were sued by cattle ranchers for "food slander". Lyman and Oprah won six years later.
http://www.madcowboy.com/