The crunchy, low calorie, high fiber stalk of the celery plant is an important source of many antioxidants and phytonutrients. Braise it, juice it, add it to soups or stir fries, or pile some peanut butter on for a fun snack. And don't forget the leaves—they're nutritious and flavorful, too.

Apples that are past their prime might not be great for biting into as an afternoon snack, but they’ve still got some life left in them. Older apples are great for juicing and cooking! 

Named after the national bird of New Zealand, the kiwi fruit is a great source of vitamin C, and its potassium content by weight is just less than that of a banana.