Bananas, as a food, do not have the efficacy of drug laxative, so there is no everyone eating bananas are laxative. Bananas are rich in sugar, vitamins, dietary fiber and other nutrients, but also rich in potassium and other minerals. Moderate consumption of bananas can supplement the body’s nutritional requirements, help maintain the body metabolism, has a certain nutritional value. As the dietary fiber contained in bananas can promote gastrointestinal peristalsis, helping to prevent or relieve constipation. It should be noted that unripe bananas contain branched-chain starch, which is not easy to digest, while ripe bananas (with black spots) are a bit more effective in relieving constipation. However, as a food, banana contains a limited amount of active ingredients and does not have the laxative effect of drugs. However, for patients with poor gastrointestinal function, after consuming a large amount of bananas, they cannot digest food properly, but tend to aggravate the symptoms of constipation. It is recommended that if constipation and other symptoms, should be timely to the hospital, do not eat bananas to laxative.