Bananas are an excellent source of many essential nutrients, such as potassium, magnesium, and vitamin B6, which are important for overall health and muscle function (6). They are also rich in carbohydrates, which makes them a great energy source for bulking. Bananas are also a great addition to other higher-calorie foods, such as peanut butter, or mixed into protein shakes. This makes them a convenient and suitable option to include in your bulking diet.