Drop 10 pounds, just by sipping your favorite java! Research shows that drinking eight ounces of coffee (for reference, a Starbucks tall is 12 ounces) can rev your metabolism by as much as 4 percent over two and a half hours. Keeping a gentle buzz going translates to burning an extra 100 calories a day, which—boom—gets you to 10 pounds a year.
Why? Coffee contains a duo of calorie incinerators: caffeine and the antioxidant chlorogenic acid, which helps metabolize sugar and fat. To reap the benefit, nail the timing: Your body begins breaking down caffeine after an hour and a half, so rather than going all in on an 8 a.m. venti, plan on periodically refilling a smaller cup, up to four times daily.
General Health Magazine 