A banana is the perfect on-the-go snack, already wrapped and full of potassium and fiber to promote long-lasting energy and keep you alert all day long. And since it contains no fat or salt, bananas are a much healthier snack option than a granola bar or bag of pretzels. Want to make your bananas last longer? Here’s a trick: Store them in the refrigerator after they’re ripe. Although the peel may turn brown, the fruit underneath will stay delicious for three to five extra days.