Banana is a common fruit, rich in vitamins, minerals, fiber and other nutrients, for improving the body’s resistance, promote defecation, etc. have a certain auxiliary effect. There is no clinical rule which 8 kinds of people can not eat bananas, as long as the consumption of moderate amount generally will not cause harm to the organism, but the following categories of people are recommended to eat limited. 1, patients with gastrointestinal diseases: such as gastric ulcer, gastritis, etc., the consumption of excessive bananas will not only stimulate the gastrointestinal tract, but also because of the excessive dietary fiber caused by difficult to digest, thus aggravating the gastrointestinal tract diseases; 2, patients with kidney disease: kidney function or edema patients should eat less. Patients with renal insufficiency or edema should eat less or avoid bananas, because the potassium in bananas needs to be metabolized by the kidneys, which will easily increase the burden on the kidneys and thus aggravate the disease; 3, other: bananas contain a certain amount of sugar, and diabetic patients who consume too much may have higher blood sugar. In addition, bananas contain a large amount of potassium. Patients with hyperkalemia or heart failure should eat less bananas to reduce potassium intake so as not to increase the circulatory burden. In addition, from the perspective of Chinese medicine, people with cold constitution, chronic diarrhea and fasting are not recommended to consume bananas, which are cold in nature and may cause abdominal pain or aggravate diarrhea and other gastrointestinal reactions if consumed in excess.