Bananas are very healthy and delicious. Bananas are among the most famous fruits in the world. The color, size and shape of bananas vary. A medium-sized banana contains around 105 calories. Bananas can help lower blood sugar after meals and may reduce appetite by slowing it down. Empty the Stomach Dietary fiber has been linked to several health benefits. Potassium is an essential mineral for heart health, especially blood pressure control. Potassium is essential for controlling blood pressure and healthy kidney function.