If you're already healthy then what is the point to change?
By becoming vegan/vegetarian you're putting yourself in an inconvenience. Instead of limiting yourself in that way, you should just limit yourself in general.
For example, don't eat junk food. It's as simple as that.
Meat provides you with a lot of nutrition, and for myself It's a big portion of my meals everyday.
Unless you have a religious reason to cut the meat, I don't think you should.