1, avoid drinking new tea. New tea storage time is short, containing more unoxidized polyphenols, aldehydes and alcohols and other substances, the human gastrointestinal mucosa has a strong stimulating effect, easy to induce gastric disease. Therefore, black tea new tea should drink less, less than half a month of storage of new tea should avoid drinking.

2, avoid drinking the first tea. Tea in the cultivation and processing process has been contaminated by pesticides and other harmful substances, there is always a certain residue on the surface of the tea. Therefore, the first tea has a washing effect should be discarded not to drink.

3, avoid drinking tea on an empty stomach. Drinking tea on an empty stomach can dilute gastric juices, reduce digestive function. At the same time, the high rate of water absorption, can make the tea in a large number of undesirable ingredients into the bloodstream, thus triggering dizziness, panic, weakness and other symptoms.

4, avoid drinking tea after meals. Tea (green tea-based) contains a lot of tannins, tannins can react with the iron in the food, generating new substances that are difficult to dissolve, a long time to cause the human body iron deficiency, and even induced anemia. Therefore, the correct time to drink is: one hour after the meal.

5, avoid drinking tea with fever. Tea contains theophylline, the role of elevated body temperature, fever patients drink tea is tantamount to "pouring oil on the fire".

6, ulcer patients avoid drinking tea. Tea caffeine can promote gastric acid secretion, increase the concentration of gastric acid, induced ulcers and even perforation.

7, avoid drinking tea during menstruation. Drinking tea during menstruation, especially strong tea, can induce or aggravate menstrual syndrome.