I was brought up vegetarian (although I always had the choice to eat what I liked). Started eating meat and fish a couple of years ago for the first time, partially because I was not having a varied enough diet. Partially though it was down to an article I read which made the point that it is more effective to support meat producers who do things the right way than to abstain completely. This only really applies to people who are vegetarian as protest for battery farming and animal cruelty etc though..