In the tea includes the massive tannic acid, may with food in protein union, form the massive albumen tannate, is not easy to digest, even may have the constipation.

• 茶叶中含有大量的鞣酸，可与食物中的蛋白质结合，形成块状的鞣酸蛋白，不易消化，甚至可产生便秘。