Green Tea & Weight Loss
Green tea is one of the better-studied ingredients in the slimming-tea category. The evidence points to a much smaller effect than dramatic marketing language can imply.
What reviews have found
NCCIH says catechins and caffeine may have a modest effect on body weight. A Cochrane review found a small, statistically nonsignificant average weight change outside Japan and concluded the effect was unlikely to be clinically important.
Tea beverage vs extract
Evidence and safety can differ between brewed tea and concentrated extracts. NCCIH reports no safety concerns for green tea consumed as a beverage by adults, while noting adverse effects and rare liver injury reports primarily involving extracts.