Have you heard of an energy drink called fuze? One bottle only has 10 calories and it keeps me full, so then I don't eat too much. It tastes really good too. It has some ingredient in there that helps with your metabolism.
This is their website:
http://www.drinkfuze.com/
If you go to the top left corner where it says products and then click slenderize, that's the one I'm talking about.