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Kiwi

This fuzzy little fruit has about 65 milligrams of vitamin C per serving—nearly as much as an orange. It's also rich in potassium and copper and contains more fiber per ounce than a banana, which makes it a good aid to digestion. (In one study, eating two kiwis a day for one month lessened constipation in people with irritable bowel syndrome.)

Kiwis are slightly tart. They're delicious by themselves, but if you prefer a sweeter flavor, try mixing them with strawberries and bananas in a smoothie or fruit salad.

Next: Orange juice