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Vitamin C

Why you need it: Vitamin C is an important antioxidant, and it's also a necessary ingredient in several key bodily processes, such as protein metabolism and the synthesis of neurotransmitters.

Where to get it: Most people think citrus when they think of vitamin C, but sweet red peppers actually contain more of the vitamin than any other food: 95 mg per serving (well ahead of oranges and just edging out orange juice, at 93 mg per serving). Other good sources include kiwi fruit, broccoli, Brussels sprouts, and cantaloupe.

Try this recipe: Stuffed Roasted Red Peppers

Next: Calcium