Tea is rich in vitamin C, E tea polyphenols and catechins, but also contains a variety of trace elements zinc, selenium, molybdenum, etc. Tea polyphenols can inhibit the growth and reproduction of cancer cells and can change the characteristics of the cell surface receptors to protect cells from cancer, and tea can counteract the carcinogenic effect of nitrosamines. 1. The caffeine, flavonoids and tea polyphenols in green tea have direct anti-cancer effects. 2. Tea can enhance the immunity of the body: there are proteins, amino acids, carbohydrates and trace elements in tea. 3, help the body to remove harmful substances: tea has a diuretic effect, but also can make toxic substances inactivation, detoxification. 4. Inhibit the synthesis of nitrosamines. 5, against the harmful effects of alcohol and tobacco: drinking tea can promote the excretion of alcohol, caffeine can reduce the harmful effects of smoke. 6, it is recommended that all patients do not drink too strong, too hot tea