Another weight-loss tea bursting with ECGC? Green tea. The combo of caffeine and ECGC found in the tea has been found to help you lose weight and keep it off, per a meta-analysis on 11 studies in the International Journal of Obesity. It does have less caffeine than black tea, making it easier to sip any time of day without having an effect on your sleep later that night. (Check out these other astounding benefits of green tea.)
OK, we’re totally cheating here. Hint Water isn’t carbonated, cola-flavored or sold in 64-ounce Big Gulps. But these new flavored bottled waters do have 60 milligrams of caffeine, derived from coffee beans. That’s more than you’ll find in Diet Dr. Pepper (41 mg), Diet Coke (47 mg) or even Mountain Dew (54 mg). So you get all of the pop, with none of the calories—and each flavor is sweetened not with aspartame, but with fruit juice or spice. Try the Lemon Cayenne Hint Kick (and don’t overdo it, since caffeine can dehydrate you), and you’ll never go back to Diet Coke again.