Tea can refresh the mind and promote digestion. However, drinking too much tea will hurt your health, especially the elderly. Once you often drink a lot of strong tea, you are prone to the following symptoms:
First, the gastric juice is diluted and cannot be digested normally. Because a person normally secretes 1.5 ~ 2.5 liters of gastric juice every day, these gastric juices can reasonably digest the food that a person consumes every day, while strong tea will dilute the gastric juice, resulting in indigestion, abdominal distension and abdominal pain.
Second, it hinders the body's absorption of iron. Tea contains tannic acid, black tea contains about 5%, and green tea contains about 10%. When people drink a lot of strong tea, the combination of tannic acid and iron will be active, which will bring obstacles and influence to the absorption of iron and cause iron deficiency anemia. There are few Pu 'er (cooked Pu 'er) and Tibetan tea, so you don't have to worry about the influence of tannic acid when drinking this kind of tea, which is suitable for the elderly and children.
Third, it is easy to cause constipation. Tannic acid in tea can also combine with protein in food to form a large amount of tannic acid protein, which is difficult to digest and absorb, leading to constipation.