ok wait a sec.... are you saying that the carbonation makes you retain water? But isn't caffeine a dieuretic? So shouldn't they both cancel out? I know that soda, plain or diet is bad already, i mean it can clean rust, and it fucks up your bones. But im talking like 2-3 cans MAX while im at work for 9 hours and people around me are doing nothing but eating donuts, eating chinese takeout, drinking coffee with loads of white sugar, cuban bread and jelly, chocolate candy etc....