There is research that just came out that may change you're mind about being a vegetarian.
Scientists have discovered that after being a vegetation for a long time, it can start to shrink you're brain.
Vegetarians are 6x more likely to suffer from brain shrinkage than us meat eaters. But that does not mean you should switch to meat and don't eat veggies, you just need to have a nice balance.
The brain needs B-12 to stay healthy, and veggies don't provide that. Meat is the e=only excellent source of B-12, and so if you don't eat meat, you don't have B-12, thus the shrinkage of the brain.
http://righttruth.typepad.com/right_truth/2008/09/going-vegetarian-can-shrink-your-brain.html
http://www.abovetopsecret.com/forum/thread391316/pg1