How about another reason to eat bananas? Most of us know bananas are a rich source of potassium and can help us keep our blood pressure down. The average medium-size banana contains only 100 calories and has 3 grams of fiber. But here is something about bananas that may surprise you. A British study found that eating bananas daily may protect children from asthma symptoms! Make sure you keep bananas available for your children and eat them yourself, too!