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Flaxseed

Sprinkling ground flaxseed into a smoothie or bowl of cereal will turn your breakfast into a gold mine of omega-3 fatty acids; just two tablespoons contains more than 100% of your recommended daily intake for those heart-healthy fats. Flaxseed, which has a nutty flavor, also is rich in fiber and lignan, an antioxidant that's been shown to protect against breast cancer.

A word of caution: Whole flaxseeds will pass through your body without being digested, so be sure to buy them ground or grind them yourself with a coffee or spice grinder.

Next: Blueberries