All kinds of people can drink green tea in moderation according to their actual situation, there is no absolute contraindication crowd. Patients with gastritis and other basic stomach diseases need to control their intake in moderation. Pregnant women, children and other special groups are not recommended to drink too much green tea. Green tea is unfermented tea. Green tea is more nutritious, every 100 grams of green tea (dry) contains 328 calories, 50.3 grams of carbohydrates, 34.2 grams of protein, 2.3 grams of fat, 325 milligrams of calcium, 14.4 milligrams of iron, vitamin C 19 milligrams. Drinking green tea in moderation can make some of the nutrients dissolved in water, to help the body to replenish water and a certain amount of nutrients, good for health. Green tea contains more tea polyphenols and caffeine. Tea polyphenol is a good antioxidant and also has astringent effect, but tea polyphenol is more irritating to the gastrointestinal tract. Caffeine is also irritating to the stomach. Suffering from gastrointestinal diseases, such as gastritis, gastric ulcer, gastroesophageal reflux patients are not suitable to drink strong green tea, you can properly reduce its intake or dilute the concentration of tea to avoid gastrointestinal reactions. Pregnant women, children and other special groups are also not recommended to drink too much green tea. Ordinary people should also drink green tea according to their own actual situation, and at the same time, you can choose other tea drinks, such as lemon tea, barley tea, etc. together to help the body to replenish enough water.