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Intake of Oily Fish Once a Week may Prevent Vision Loss in Old Age

by VR Sreeraman on August 10, 2008 at 9:42 AM
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 Intake of Oily Fish Once a Week may Prevent Vision Loss in Old Age

Intake of oily fish once a week may reduce age-related macular degeneration (AMD), a major cause of blindness and poor vision in the elderly, says a new study published in the American Journal of Clinical Nutrition.

There are two types of AMD, wet and dry. Of the two, wet AMD is the main cause of vision loss.

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A team of researchers across seven European countries and co-ordinated by the London School of Hygiene and Tropical Medicine sought to investigate the association between fish intake and omega 3 fatty acids with wet AMD, comparing people with wet AMD with controls.

In the study, participants were interviewed about their dietary habits including how much fish they ate and what type.

Information on the main omega 3 fatty acids (docosahexaenoicacid (DHA) and eicosapentaenoic acid (EPA) was obtained by linking dietary data with food composition tables.
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The findings show that people who habitually consume oily fish at least once a week compared with less than once a week are 50percent less likely to have wet AMD.

There was no benefit from consumption of non-oily white fish. There was a strong inverse association between levels of DHA and EPA and wet AMD. People in the top 25percent of DHA and EPA levels (300 mg per day and above) were 70 percent less likely to have wet AMD.

Astrid Fletcher, Professor of Epidemiology at the London School of Hygiene and Tropical Medicine, who led the study, said: "This is the first study in Europeans to show a beneficial association on wet AMD from the consumption of oily fish and is consistent with results from studies in the USA and Australia.

"Two 3oz servings a week of oily fish, such as salmon, tuna or mackerel, provides about 500 mg of DHA and EPA per day".

The research team is not, however, recommending omega 3 supplements as the study did not investigate whether supplements would have the same benefit as dietary sources.

Source: ANI
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