Senior Journal - Those fish oils called omega 3 fatty acids – already associated with a number of health benefits for senior citizens - have now been found to play a role in lowering the risk of the number one cause of blindness in senior citizens – age-related macular degeneration. In this study, most of the omega 3 came from fish, nuts and olive oil. And, it also helps to avoid trans fats.
The supporting evidence comes from two reports in the May issue of Archives of Ophthalmology, one of the JAMA/Archives journals.
By 2020, as many as 3 million Americans are expected to have late-stage age-related macular degeneration (AMD), according to background information in one of the articles. AMD is the leading cause of severe vision loss among individuals older than 65 in the developed world. Established risk factors include age, genetic markers and smoking (the only consistently reported modifiable risk factor).
In one report, Jennifer S.L. Tan, M.B.B.S., B.E., of Westmead Hospital, University of Sydney, Australia, and colleagues studied 2,454 participants in the Blue Mountains Eye Study, which began in 1992 to 1994. At that time, participants completed a food frequency questionnaire that was analyzed to determine their intake of various fatty acids. Digital photographs of the retina were used to assess the development of AMD five and 10 years later.
● After adjusting for age, sex and smoking, eating one serving of fish per week was associated with a 31 percent lower risk of developing early AMD.
● The association was stronger among individuals with a lower intake of linoleic acid, an unsaturated omega-6 fatty acid found primarily in vegetable oils.
● Eating one to two servings of nuts per week was associated with a 35 percent lower risk of early AMD.
"In conclusion, our findings support the hypothesis that increased intake of omega-three polyunsaturated fatty acids and regular consumption of fish and/or nuts in the diet may protect against the development of early AMD," the authors write.
These fatty acids may protect the eyes by preventing the buildup of plaque in the arteries or reducing inflammation, blood vessel formation and oxygen-related cell damage in the retina.
Joint effects of protection against AMD were suggested between the consumption of these foods and other factors, such as smoking, intake of unsaturated omega-6 fatty acids or beta carotene and the ratio of total blood cholesterol to HDL or "good" cholesterol.
"These findings also suggest that an appropriate balance among various nutrients is essential for maximizing nutritional benefit," they continue.
Further studies are needed to determine whether changing an individual's diet or recommending supplementation could prevent or delay the development of AMD.