Have a Banana???

How much sugar is in a banana?

In a medium sized banana which is usually around 126g, there is at least 21g of sugar.

Bananas raise are high enough in sugar and starch to contribute to high glucose levels, especially since they are often consumed without other fats and proteins, which could at least slow the absorption of glucose. Not good. Therefore they also raise insulin levels, also not healthy or conducive to weight control, regardless of the low caloric content (high chronic insulin levels & constant carbohydrate intake drives fat storage and prevents burning body fat for energy).
12gram in a small banana,14gram in a medium banana,17gram in a large banana,19gram in an extra large banana.