Green tea
Green tea has been associated with decreasing blood glucose, inhibiting hepatic and body fat accumulation, and stimulating thermogenesis due to the catechins that are present. Catechins are polyphenols that are a major component of green tea extract. Green tea has also been shown to increase energy expenditure and fat oxidation in humans, independent of the caffeine content. In a human study conducted, 690 mg of catechins daily for 12 weeks reduced body fat, suggesting that green tea might be useful in the prevention of chronic disease, particularly obesity. Moreover, catechins in the brain play a major role in satiety.