1 lowering harmful cholesterol people who drink five cups of black tea every day have lower low-density lipoprotein than people who drink colored drinks that look like tea (7% ~ 1 1%). Low density lipoprotein is called "bad cholesterol", which increases the risk of heart disease.

2 Prevention of osteoporosis Black tea contains a variety of water-soluble vitamins, but also rich in trace element potassium. After brewing, 70% of potassium can be dissolved in tea. Studies have shown that potassium can not only enhance the blood circulation of the heart, but also prevent or reduce the consumption of calcium in the body. In addition, manganese contained in black tea is also one of the indispensable elements in bone structure.

3 Prevention and treatment of influenza A The substances contained in black tea can effectively kill influenza virus, and gargling with black tea or drinking directly can prevent influenza. The researchers soaked the virus-infected area with black tea liquid four times weaker than usual for only a few seconds and found that the virus there would lose its infectivity.

4 the effect of promoting fluid production and clearing heat Drinking black tea in summer can quench thirst and relieve summer heat, because polyphenols, sugars, amino acids and pectin in tea react with saliva, which stimulates saliva secretion, makes the mouth feel moist and produces a cool feeling; At the same time, caffeine controls the body temperature center of hypothalamus and regulates body temperature. It also stimulates the kidneys to promote the excretion of heat and dirt and maintain the physiological balance in the body.