Green tea contains caffeine and a type of flavonoid called catechin. Catechin is actually a type of an antioxidant. Studies suggest that these compounds can help to speed up the metabolism, while catechin is known to effectively break down the excess fat in the body.
A small study carried out in 2010, revealed that green tea supplements can actually have a positive impact on people trying to shed kilos and manage their weight.
Green tea is considered safe for consumption but the daily dosage must not be more than 2 to 3 cups. It is true that green tea is safe and healthy, but it does contain some amount of caffeine. So, excess intake of caffeine in a day can lead to sleep issues and may be harmful to people suffering from heart problems.