Green tea does not have a direct weight loss effect, but green tea contains tea polyphenols, caffeine, amino acids, vitamins, catechins, etc., which can play the role of laxative, diuretic and digestive. Therefore, during the weight loss period, appropriate consumption of green tea can play a certain weight loss effect, but also need to cooperate with diet control, physical exercise, in order to achieve the purpose of weight loss. The caffeine in green tea can promote the secretion of gastric juice, thus promoting digestion; the cellulose in tea can play a laxative role, which can help alleviate the constipation that often occurs during weight loss; catechins can help enhance the body’s metabolism, playing a role in increasing energy consumption and aiding weight loss. It is generally recommended to drink green tea about an hour after a meal to help digestion. However, people with weak spleen and stomach, poor gastrointestinal function, and gastrointestinal diseases such as gastric ulcer and duodenal ulcer are not recommended to drink green tea regularly, otherwise it is easy to increase the burden on the stomach and intestines, causing diarrhea, abdominal pain and other adverse reactions, and may also promote the secretion of gastric juice, which is not conducive to the recovery of the disease. Green tea can play a weight loss effect is usually weak, and a large number of green tea consumption may appear excessive nervous excitement, insomnia, and even anemia. So simply drinking green tea can not achieve the purpose of weight loss, want to get good weight loss effect also need to adjust the diet structure, appropriate aerobic and anaerobic exercise, develop good habits, and long-term adherence.