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Spinach

Why it's super: Powerful antioxidants in spinach have been found to combat a variety of cancers, including ovarian, breast, and colon cancers. And it's good for the noggin: Research indicates that spinach reduces the decline in brain function associated with aging and protects the heart from cardiovascular disease. Although it contains relatively high amounts of iron and calcium, oxalate compounds bind to these minerals and diminish their absorption.

How to enjoy it: Spinach has a mild flavor, so spice it up with garlic, olive oil, and onions.

Next: Sweet potatoes