Pu 'er tea has many functions, and it is a good tea for health preservation: the side effects are the lowest, almost none, that is, all teas have tannic acid. If it is too high, although it has the effect of losing weight, it is easy to hurt the stomach. Pu 'er tea (cooked tea) is different. After stacking fermentation, the tannic acid decreased greatly, while the water extract, tea safety acid and tea polysaccharide increased. These are the main components to reduce the three highs.