A banana can contain between 17 to 22 grams of sugar, depending on its size. Although bananas taste sweet, their glycemic index value is low. The glycemic index measures how ingesting a food can impact the blood sugar level.
While bananas are higher in sugar than some fruits, they also provide several digestion-friendly health benefits. One banana contains about 3 grams of fiber, which helps to increase the rate of digestion. Within the banana's fiber is a water-soluble pectin, which helps to monitor the rate of carbohydrate digestion and controls the effects of eating bananas on the blood sugar level.