I think it is a myth that vegetarians are thinner. I was a vegetarian (ovo-lacto) for 16 years and I recently went back to eating all meat. I feel better and I eat less. I think being a veg is tricky and you have to make sure you get all of the correct supplements. For example, if you don't get sufficient B12 over a long period of time you can cause permanent brain damage. There are studies now suggesting that soy protien is not all that good for you and it is VERY tough getting enough protein, even as ovo-lacto.

I find that since I started eating meat again my moods are MUCH more even keel. I am sure I was not getting Amino Acids or something else that I needed from meat. I would suggest limiting your beef intake to sirloin (this is very low fat) and meat that you know has not been hormone fed/treated. This is easy to find in most grocery stores today. I usually get mine at Ralphs