The American Heart Association once concluded that black tea is "one of the drinks rich in flavonoids, which can eliminate free radicals, have anti-acidification effect and reduce the incidence of myocardial infarction". The results show that a cup of black tea can even play a stronger anti-acidification role than garlic, broccoli, carrots and Chinese cabbage for specific free radicals. The drinking method of acid-resistant black tea is to drink 2 ~ 3 cups of black tea every day. Selenium, vitamins c, e, a, etc. They are all anti-acidification substances, and black tea will be more effective if eaten with foods rich in these substances. Drinking black tea with vegetables, fruits, butter, milk and eggs at the same time is called a healthy and reasonable eating habit. But at the same time, we should also pay attention to avoid eating too much calories and sugar. Black tea also has various antibacterial effects to prevent colds. Flavonoids in black tea have antibacterial effects such as killing poisonous bacteria in food and making influenza virus infectious. In addition to preventing colds, some people gargle with black tea when a cold causes a sore throat. Precautions for drinking black tea: the newer the new tea, the better. Improper drinking methods can easily hurt the stomach. Because new tea has just been picked, it has a short storage time and contains more unoxidized polyphenols, aldehydes and alcohols, which has little effect on healthy people. But for patients with poor gastrointestinal function, especially those with chronic gastrointestinal inflammation, these substances will stimulate gastrointestinal mucosa, and people with poor gastrointestinal function are more likely to induce stomach diseases. Therefore, it is not advisable to drink more new tea, and do not drink new tea that has been stored for less than half a month. In addition, new tea also contains more caffeine, active alkaloids and various aromatic substances, which will also excite people's central nervous system. Patients with neurasthenia and cardiovascular and cerebrovascular diseases should drink in moderation, not before going to bed or on an empty stomach. The correct way is to leave it for half a month before using it. Qimen black tea Qimen black tea China Darjeeling Indian Upa Uva Sri Lankan green tea efficacy 1. Green tea anti-aging II. Green tea antibacterial III. Green tea lowers blood fat. Green tea slimming and fat reduction 5. Green tea can prevent dental caries and remove bad breath. Green tea prevents cancer. Whitening and ultraviolet protection of green tea. Green tea can improve indigestion.