I just flipped the switch one fine day in 2011 - to go vegetarian, it was at the back of my mind via various sources, I wont go into that. However mentally for me it was lack of exercise and meat just made me lethargic and I felt vegetarianism will help.

So I turned vegetarian and started exercise (tennis, walks) and I started feeling the benefits.

Hindsight (20/20) of course, I think it was just exercise that was needed. I think we are what we eat but we are polished if we exercise.

Last year I tried just eggs a bit (for me vegetarian = no meat/fish/eggs, definition I guess allows eggs) but did not like the taste, after 6 years of vegetarianism.

I woud overall say, listen to your body, eat what you like, but don't forget to burn those fats irrespective of if you eat meat or not.