Caffine makes your retain a lot of water, so if you want to drink caffine every once and a while ( its not good for you) i would suggest drinking extra water to help move it along. or try decaf!
because caffeine gives you energy and if you look on ANY weight loss pill bottle it says "to be used WITH a healthy diet and excerise" the caffeine is to give you energy throughout the day and to excerise so you think it's actually doing something.