Black tea is rich in nutrients, drinking black tea in moderation can supplement vitamins and minerals, black tea also contains tea polyphenols, caffeine and other ingredients, but there are no eight groups of people should not drink black tea, it is usually recommended that the following groups of people drink less or do not drink black tea: 1, pregnant women, lactating women: black tea contains caffeine and other ingredients, pregnant women drink a lot of black tea may stimulate the fetus, lactating women drink a lot of black tea through the breast milk After feeding to the baby, may lead to adverse effects on the baby, so pregnant women, lactating women should drink less or do not drink black tea; 2, malnutrition: black tea contains caffeine, phospholipids and other ingredients, which help regulate fat metabolism, but also promote gastric secretion, help digestion, so malnutrition, too thin people should drink less or do not drink black tea, so as not to aggravate malnutrition or other adverse effects on the body; 3, vegetarians: black tea contains caffeine, phospholipids and other ingredients, which help regulate fat metabolism, but also promote gastric secretion, help digestion. 3, vegetarians: black tea has the effect of relieving grease, aiding the elimination of food, loved by meat-eating people, vegetarians drink a lot of black tea may cause the lack of nutrients, such as lack of iron, calcium and other components, so vegetarians should drink less or do not drink black tea; 4, insomniacs: black tea in the caffeine can excite the central nervous system, with refreshing effect, insomniacs drink a lot of black tea may aggravate the symptoms of insomnia, so Insomniacs should drink less or do not drink black tea; 5, severe atherosclerosis, hypertension patients: black tea contains theophylline, caffeine and other active substances, severe atherosclerosis, hypertension patients drinking large amounts of black tea may promote thrombosis, so severe atherosclerosis, hypertension patients should drink less or do not drink black tea; 6, anemia: black tea contains tannic acid, can be combined with iron, is not conducive to the recovery of anemia patients, but also May aggravate anemia, so anemic people should drink less or do not drink black tea; 7, other: menstruation, hypoglycemia patients, etc., is not recommended to drink black tea, may lead to dysmenorrhea, blood sugar further decline and other adverse effects, endangering health.