Green tea, because it's less processed, has a higher concentration of polyphenols, also called catechins, then any other types of tea, including black and oolong. The catechins in the green tea are one of the active ingredients linked to weight loss. They might prevent the accumulation of body fat, as well as increase body temperature so you burn more calories.
In addition to catechins, green tea is also a source of caffeine. Caffeine helps your body burn both calories and fat, according to the Office of Dietary Supplements, burning 9 extra calories for every 100 milligrams of caffeine you drink.
However, while lab and animal studies seem to indicate that the components in green tea decrease fat production and increase fat- and calorie-burning, its weight loss benefits for humans are less certain, according to a 2010 review article published in The Journal of Nutrition.
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