I stopped eating meat ~4 years ago, but still eat eggs and a limited amount of dairy. I occasionally eat fish when abroad or when there's no other healthy option (maybe it happens once every month or two). I haven't seen any impact on my health and I exercise regularly.

Apart from the obvious cruelty / environmental impact etc... What I like about being vegetarian (or mostly veggie) is that I started to eat a lot of different food, a lot of ingredients I would have never touched before. Constraints drive creativity and it's true in the kitchen too.

In a world of food abundance, I enjoy the restrictions of a self-imposed diet. Having those rules helps me eat healthy food.