A lot of people who wants to lose weight drink green tea, that is why it is considered as popular weight-loss supplement. It also improves blood sugar regulation. It helps to improves metabolic health. Scientists from the University of Porto in Portugal found that green tea prevented fat cell development and promoted fat cell death in rats. Green tea was their only beverage during the six-month experiment. They speculated that chemicals in green tea such as caffeine and catechins particularly epigallocatechin-3-gallate speed metabolism and fight fat. Green tea is an effective fat fighter that decreases fat cell size and number. If you are a bodybuilder you need to use it with caution because green tea, however, also increased the conversion of testosterone to estrogen in fat cells, which might have negative effect in bodybuilders.