Caffeine is diuretic, so it encourages excretion of water through the bladder. However, that is only one side of the picture.
Green tea may encourages urine, but it is not loaded burnt carbon like coffee is, so it is not TCM hot. Coffee is TCM hot so it encourages the fire energy while lowering your yin energy. You feel hot at the lis and tongues, sometimes maybe the eyes too, feel energetic sometimes, but down very easily.
Although most teas are diuretic, but not as many can help to dissipate humid toxins. To facilitate the body to dissipate humid toxins in a person who has been affected through exposure to TCM hot intakes, such as coffee, it’ll require some substances that helps the cells to expel water and/or unwanted lipids mistaken trapped in or near themselves. Only Phoenix oolongs or Wuyi dried with low fire (but really completely dried) can do the job.
