Green tea is full of polyphenols, which protect your cardiovascular system and could explain the beverage’s link to longevity, says study author Dongfeng Gu, MD, Ph.D., researcher at the Chinese Academy of Medical Sciences in Beijing. Black tea may not have the same effect since it undergoes a fermentation process that destroys polyphenols.
Those micronutrients move through the body quickly, Gu notes. That’s why you need to drink green tea regularly to get the benefits.
The bottom line: