Health Benefits of Bananas Bananas are a healthy source of fiber, potassium, vitamin B6, vitamin C, and various antioxidants and phytonutrients. … Nutrition facts Calories: 89. Water: 75% Protein: 1.1 grams. Carbs: 22.8 grams. Sugar: 12.2 grams. Fiber: 2.6 grams.…