Tea contains proteins, tea polyphenols and other substances, drinking tea in moderation every day can help the body to supplement the required tea polyphenols and other nutrients, which is good for health; the downside is that drinking strong tea or a large amount of tea may aggravate the symptoms of patients with insomnia and patients with gastric disorders such as gastric ulcers. Tea is a beverage made from tea leaves, tea is rich in nutrients, including tea polyphenols, plant alkaloids, protein, amino acids, vitamins, pectins, organic acids, lipopolysaccharide, potassium, calcium and so on. Take green tea as an example, every 100 grams of green tea (dry) contains 328 calories, of which 50.3 grams of carbohydrates, 34.2 grams of protein, vitamin C19 mg, calcium 325 mg, iron 14.4 mg. Drinking tea in moderation can replenish the nutrients needed by the body and is good for health. Tea contains caffeine and other ingredients, will excite the brain nerve center, insomnia crowd should not drink a lot of tea, to avoid aggravating the symptoms of insomnia. Tea can stimulate the secretion of gastric acid, aggravate stomach discomfort, so people with gastric ulcers and other stomach diseases should not drink strong tea. Drinking tea needs to be moderate, avoid overeating, so as not to cause adverse reactions.