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Sunflower seeds

These crunchy snacks are among the best natural sources of vitamin E, an antioxidant that protects cell walls from damage; a single one-ounce serving contains 30% of your recommended daily intake. (For a healthier choice, be sure to choose dry-roasted seeds over those roasted in oil.)

Vitamin E may be especially important for the health of our lungs, where it appears to fight the harmful process known as oxidative stress. A 2003 study in Scotland found that people with diets high in vitamins C and E had greater lung capacity and produced less phlegm.

Next: Oats