Banana is a kind of fruit that people like very much. Bananas are rich in sugar, protein, vitamins, minerals, dietary fiber and other nutrients, which are beneficial to human body: 1, energy supplement: bananas have high sugar content, which can quickly replenish energy for the body after eating, and magnesium contained in bananas also has the effect of eliminating fatigue, which is conducive to helping the body recover its physical strength and relieve fatigue; 2, laxative: bananas are rich in dietary fiber, on the one hand, they can promote intestinal peristalsis, on the other hand, they can absorb water and soften feces, thus playing a laxative role; 3, help sleep: bananas contain a certain amount of 5- hydroxytryptamine, which has a certain effect on insomnia or emotional tension. If eaten before going to bed, it has a certain effect of helping sleep; 4. Prevention and treatment of hypertension: bananas are rich in potassium ions, which can antagonize sodium ions to contract blood vessels. Eating bananas often helps to maintain the balance of sodium and potassium in the body, so as to keep the neuromuscular normal and coordinate myocardial contraction, thus playing a role in preventing and treating hypertension. Pay special attention to the difference between raw bananas and cooked bananas. Cooked bananas are rich in fiber, which can promote intestinal peristalsis. A large amount of water-soluble fiber can cause hyperosmotic gastrointestinal fluid secretion, thus absorbing water to solid parts, making feces soft and easy to discharge. But raw bananas contain more tannic acid, which has a strong astringent and antidiarrheal effect, so eating too many raw bananas may cause constipation.