A medium-sized banana contains about 27 grams of carbohydrates, according to the USDA.
These carbohydrates in banana are mostly in the form of natural sugars such as glucose, fructose and sucrose.
Bananas are also a good source of fiber which is a type of carbohydrate that the body cannot digest. A medium-sized banana has about 3 grams of fiber. 1 Fiber promotes digestive health, regulates blood sugar levels and helps you feel full and satisfied.2
Bananas are also rich in other nutrients such as potassium, vitamin C, vitamin B6 and manganese.1 If you’re following a low-carb or ketogenic diet you may need to limit your banana intake because of its carbohydrate content.