There is no standard for the maximum number of bananas to be consumed in a day, generally 1-2 bananas is appropriate, 3-4 bananas is beyond the recommended consumption. The calorie content of banana is 89kcal/100g, which belongs to fruits with high calorie content. Consuming large amount of banana for a long period of time may lead to obesity, so it is not recommended to consume too much. Every 100g of banana contains 1.09g of protein, 0.33g of fat, 22.84g of carbohydrates, 2.6g of crude fiber and 256mg of potassium, which can supplement the body’s nutritional needs. However, it is not recommended that long-term single intake of bananas will lead to nutritional imbalance, should be eaten with meat, eggs and other proteins, as well as vegetables, to ensure adequate nutritional intake. In addition, bananas are not only high in sugar content, but also have a high glycemic index, which is not recommended for diabetic patients. Since bananas are rich in potassium, they are suitable for hypertensive patients, but are not recommended for patients with renal failure and hyperkalemia.