Fasting ordinary people can drink green tea, if there are gastrointestinal diseases, it is not recommended to often drink on an empty stomach. Green tea is a common drink, green tea contains amino acids, tea polyphenols, vitamin C, zinc, calcium and other nutrients, ordinary people without gastrointestinal disorders can be drunk on an empty stomach to supplement nutrients, generally have no effect. If you have gastrointestinal diseases, try not to drink on an empty stomach. Green tea is not fermented tea, retained within the tea, such as tea polyphenols, theophylline and other substances, these substances may have an irritating effect on the gastric mucosa, may produce discomfort. Green tea is just a drink, the general population can be taken in a variety of ways, if there are gastrointestinal disorders of the population after drinking green tea have symptoms of discomfort, you need to go to the hospital in a timely manner.