First off, I'm a teenager, and my whole young life, I've never exactly loved meat. So about a year and a half ago, I began drifting away from it completely without even thinking about it. Suddenly, turkey cold-cuts (the only cold-cuts I would eat) didn't appeal to me anymore, I got picky with how my burger was cooked, pork was exceptionally nasty, etc. I was always fine with seafood, however.
Then I discovered that most meat-animals are pumped full of disgusting hormones and chemicals that are transferred to whoever eats them. That was a huge con of eating land animals. I also found out how they are treated in factory farms. (Organic meat I am ok with, and luckily because of a condition my little brother has, most of the time my family tries to be organic. To make it easier on myself I decided to just drop all meat besides fish.) Fish, however, are caught most of the time, and in my mind, they are much lower on the food-chain than cows, pigs, and chickens.
And if all this wasn't enough to convince me, I learned the horrible truth about gelatin. -shiver- Gross.
Veggie burgers are also much tastier than regular burgers. ;P
So I've been pescetarian since June of 2008 and I am loving it! My New Year's Resolution is gonna be to keep better track of my gelatin intake... did anyone know that Yoplait yogurt has beef-derived gelatin in it?!