Many people like to drink tea in everyday life. The variety of tea is rather diverse, including green tea, black tea, and oolong tea and so on. Tea is rather beneficial to the human health if people drink tea in a right amount. Take black tea as an example. Although too much black tea can cause excessive internal heat, moderate black tea can effectively help people keep healthy.

Black tea can improve the urination for the human body. Under the united action of and fragrant substances contained in black tea, the blood volume in kidney can be increased, the capillaries in kidney can be expanded, the re-absorption of water by the kidney tubules can also be restricted, which can accelerate the urination. Thus, lactic acid, uric acid, extra sugar and other toxic substances can be removed from the human body. The role of diminishing inflammation and sterilizing bacteria played by black tea is also important. Polyphenol compounds contained in black tea can effectively diminish inflammation. According to the medical research, catechins can be integrated with bacteria in single cells to solidify and precipitate protein so as to restrain and kill pathogenic bacteria. Therefore, the patients with bacteria diarrhea and food poisoning can alleviate the symptoms by drinking black tea. People can also drink black tea to refresh themselves and alleviate the fatigue. Caffeine contained in black tea can help people refresh themselves by stimulating the cerebral cortex. Thus, the human thinking and response are more acute and memory can also be enhanced. At the same time, the human heart and vascular system can be stimulated, which can accelerate the blood circulation and the metabolism. The effect of stopping thirst can not be neglected. The polyphenol, sugar, amino acid and pectin contained in black tea can react with liung to accelerate the secretion of saliva so as to make the oral cavity moist and cool. What’s more, caffeine can adjust the body temperature and discharge the wastes to maintain the physiological balance inside the human body.

In addition, black tea can prevent decayed teeth, defer the aging of the human body, decrease the blood sugar, blood pressure and blood fat, and resist cancer and radiation for people. Black tea is also a kind of sport drink, which can not only stop thirst and supplement water for the human body, but also burn the fat to provide energy for people.