Is reducing meat in your diet prone to be less fattening?

I was a vegetarian a few years ago, but it wasn’t quite working for me. I think the reason for this was a combination of taking an all or nothing attitude and making bad food choices.

So I might gradually return to a vegetarian diet at some point. For now I want reduce the amount of meat I consume for health reasons. So I’m wondering is it truly healthier and less fattening to have a diet with a reduced level of meat intake?