How does Green Coffee Bean extract help you lose weight? Is it the caffeine? Actually, this is not a stimulant that will make you jittery and raise your heart rate, like roasted coffee or ephedra would. Each serving has only about 20 mg of caffeine, compared to your regular cup o' Joe, which puts over 100 mg into your system (if you keep it to just one serving). The latest research shows that Green Coffee Bean burns fat fast. In a recent study, 16 adults supplemented their daily diet with this new fat fighter for just 12 weeks, and lost an average of 17 pounds each and they didn't change their regular eating habits, or hit the gym each morning for sweaty cardio sessions. They just took their capsules as directed and lived normally, letting the diet capsules do the rest. The chlorogenic acid in the fresh coffee beans works in two ways: it slows the release of glucose into your body, and at the same time it boosts your metabolism so you burn fat. Together, these two benefits help you manage your body weight.