If you look at the ingredients list for any fat-burning supplement, chances are that green tea will be on there. This is because green tea has been shown to increase fat burning and boost the metabolic rate, in controlled human trials (A, B).In one study of 10 healthy men, green tea increased energy expenditure by 4% (C).Another study showed that fat oxidation was increased by 17%, indicating that green tea may selectively increase the burning of fat (D).However, some studies on green tea do not show any increase in metabolism, so the effects may depend on the individual (E).Caffeine itself has also been shown to improve physical performance by mobilizing fatty acids from the fat tissues and making them available for use as energy (F, G).In two separate review studies, caffeine has been shown to increase physical performance by 11–12%, on average (H, I).Additional source (PDF)Fuel your inner Rebel and try Rebellious!