A medium-sized banana has 27 grams of carbohydrates. Bottom Line: The fiber component of bananas may aid in weight reduction by enhancing fullness and decreasing hunger. Bananas, on the other hand, are inappropriate for low-carb diets due to their high carb content. The carbohydrates in bananas are simple sugars that are easily absorbed into your blood stream after eating. This means they can quickly lead to increased levels of glucose in your body and ultimately cause a spike in your blood sugar. Eating too many bananas can therefore be harmful to your health if you're trying to lose weight by reducing carbohydrate intake. If you are looking to reduce your risk of developing diabetes or heart disease, then avoiding foods with simple sugars will help you maintain a healthy balance in your body. Bananas are very sweet so they should not constitute a major part of your diet; instead, include them occasionally as a treat to keep yourself satisfied between meals and snacks. It is important to note that not all bananas are created equal. Underripe bananas have more soluble fiber which will help you feel fuller longer. That being said, overripe bananas are mostly starch so they won't help you lose weight. In conclusion, the carbs in bananas are not good for your health if you are trying to lose weight by cutting out whole categories of food. Instead, focus on selecting healthier options when eating fruit.