Disadvantages of drinking Pu 'er tea: People with calcium deficiency or fracture should not drink tea. Because the alkaloids in tea will inhibit the absorption of calcium in duodenum, it will also lead to calcium deficiency and osteoporosis, making it difficult to recover the fracture. The health benefits of drinking Pu 'er tea are 1, weight loss, lipid reduction and prevention of arteriosclerosis. 2, prevention and treatment of coronary heart disease 3, lowering blood pressure 4, anti-aging 5, helping digestion 6, anti-cancer 7, hangover 8, diuretic drinking Pu 'er tea on the body's disadvantages: drinking too much strong tea often can cause fluorosis. People with constipation should not drink tea. Because polyphenols in tea have a certain astringent effect on gastrointestinal mucosa, constipation patients will aggravate constipation if they drink tea. People with neurasthenia or insomnia should not drink tea. Because caffeine in tea has obvious exciting effect on cerebral cortex, drinking tea will make the brain extremely excited and unable to rest. People with iron deficiency anemia should not drink tea. Because tannic acid in tea leaves will make iron in food form a precipitate that is not absorbed by the human body, which will aggravate anemia. People with calcium deficiency or fracture should not drink tea. Because the alkaloids in tea will inhibit the absorption of calcium in duodenum, it will also lead to calcium deficiency and osteoporosis, making it difficult to recover the fracture. People with canker should not drink tea. Because theophylline in tea will reduce the activity of phosphodiesterase and make gastric parietal cells secrete a lot of gastric acid. Hyperacidity will inevitably affect the healing of ulcer surface and offset the efficacy of some antacids. People with urinary calculi should not drink tea. Because tea contains more oxalic acid, drinking tea will aggravate the development of stones. It is not advisable to drink tea when you have a fever. Because theophylline contained in tea can raise human body temperature, the cooling effect of drugs is greatly reduced or even disappeared. Therefore, patients with fever should not drink tea.