Green Tea. 

Studies show that intake of green tea, or green tea extracts burns extra calories. Also, green tea with caffeine can increase fat burning by up to 40% thereby reducing fat. 

This is one good option for those who want to lose weight. In a study done, people who took green tea were found to lose 2 to 3 times more weight than those who did not drink green tea. 

These results show that green tea is a natural product for the treatment of obesity. Thus, it also makes for a healthier dietary option, not to mention the good effects that it has on the body as compared to caffeine. A cup of tea gives an immediate energy lift without the side effects of caffeine.