Two new studies give one more reason to eat a diet rich in fish: prevention of age-related macular degeneration, the leading cause of blindness in old age.
The omega-3 fatty acids found in fish such as salmon are already known to help the heart and brain stay healthy. The new studies, appearing Monday in the Archives of Ophthalmology, add to evidence that fish eaters also protect the eyes.
A study of 681 elderly American men showed that those who ate fish twice a week had a 36 percent lower risk of macular degeneration. In the other study, which followed 2,335 Australian men and women over five years, people who ate fish just once a week reduced their risk by 40 percent.
Stronger evidence may come in five or six years with results from a large, randomized study of how fish oil and another nutrient, lutein, affect macular degeneration, said Dr. Emily Chew of the National Eye Institute, who is heading that study.
Volunteers will be assigned randomly to get either fish oil, lutein, or both — or placebos.
Researchers don't yet know why eating fish seems to protect the eyes. Omega-3 fatty acids may neutralize free radicals in the eye, preventing the formation of new blood vessels, reducing inflammation or all three, Chew said.
Courtesy AP
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