Green tea is an ingredient in many weight-loss supplements, beverages and energy bars. It contains caffeine, which has been proven as a fat-burner, and has also been shown to regulate blood sugar after eating. Studies show green tea may raise a person's metabolism slightly, which makes the body burn fat faster.

On the Other: Effects Unproven

Though green tea can't hurt in a weight-loss plan, it's not a magic cure, either. As with most weight-loss products, you can't believe most marketing claims. Though green tea does boost the metabolism, studies haven't determined exactly how much this aids in weight loss. Simply drinking a lot of green tea will not burn calories; instead, the nutrients and anti-oxidants in the tea may improve your health, which would, in turn, make your body more efficient at losing weight.

Bottom Line

Diet and exercise are still the two most important factors in weight loss. But if you replace soda and other high-sugar, unhealthy drinks with unsweetened green tea, you probably will notice some weight loss--because you're drinking a calorie-free beverage instead of a calorie-laden one. If you take green tea in a supplement, make sure the other ingredients are safe, and ask your doctor before starting any diet or weight-loss program.

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