Banana nut bread is made of a sweet, quick bread batter mixed with ripe mashed bananas and nuts, and baked into a loaf. High in carbohydrates and fats, banana nut bread is rich in calories.
A one-slice serving of banana nut bread contains around 216 calories, according to the U.S. Department of Agriculture. Carbohydrates make up 116 calories, fats comprise 90 calories and proteins provide 10 calories per serving.
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The USDA also says a single slice of banana nut bread weighs 56 grams, including about 29 grams of carbohydrates, 10 grams of fat and 3 grams of protein. The remaining portion is water and other nutrients.
You can choose from many toppings for a slice of banana bread, some healthier choices than others. For example, 1 pat of butter adds 36 calories, mostly from dietary fat. Butter's fat is saturated and, if consumed in excess, can boost your blood level of unhealthy cholesterol. Peanut butter is a good alternative to butter, higher in calories with about 90 calories per tablespoon but containing no saturated fat, like all plant-based foods.
As part of a healthy diet, banana nut bread can provide significant amounts of calories from carbohydrates. The Harvard School of Public Health says dietary carbohydrates are necessary as energy for normal activity and proper organ function, but you can also make banana bread a healthier choice by using fiber-rich whole-wheat flour in homemade bread or opting for whole grain choices when buying ready-made banana bread.