I went vegetarian a few weeks ago for health reasons. I don't drink milk anyway, but I still consume some cheese and eggs. So far, I haven't experienced any energy gains, but I do feel much lighter. About a week ago, my family caught a nasty cold that was going around. Normally, I would've caught it too, but did not, and the only thing that's changed is the lack of meat in my diet. This potential itself is quite motivating.