The omega-3 fatty acids in oily fish—such as salmon and tuna—can boost your skin’s defenses against UV damage. In a study published earlier this year in the American Journal of Clinical Nutrition, researchers found that those who ate a little more than 5 ounces of omega-3-rich fish each week decreased the development of precancerous skin lesions by almost 30 percent. Scientists think the omega-3s act as a shield, protecting cell walls from free-radical damage.
