Health knowledge made personal
Join this community!
› Share page:
Go
Search posts:

High fat intake - especially saturated fat - is associated with macular degeneration

Posted Nov 23 2009 10:00pm

 

Eye Age-related macular degeneration (AMD) is the leading cause of vision loss in Americans over 60 years of age. This disease involves cell death in the macula of the eye, which has a high density of cone cells and is responsible for central vision. 1  

A recent study published in the Archives of Ophthalmology 2 investigated the relationship between fat intake and the presence of intermediate AMD 4-7 years later in over 1700 women, and found that some fats may benefit eye health while others may be damaging.

Total fat. Women aged 50-75 who consumed the highest proportion of calories from fat (43%) had the greatest risk of AMD – 70% higher odds than those with the lowest proportion of calories from fat (21%). As the authors stated,

"High-fat diets might be a marker for diets that are poor in many micronutrients that could protect against age-related macular degeneration.” 3

They then looked further into the associations between specific types of dietary fat and AMD.

Saturated fats are detrimental when it comes to heart disease and cancer, so these results are no surprise - saturated fats showed the greatest association with AMD – 60% increased odds of AMD in women who consumed the greatest amounts.  Monounsaturated fats, which are present in nuts, seeds, and avocados, were associated with a lower prevalence of the disease.

The associations between polyunsaturated fats and AMD are more difficult to interpret – the authors reported that both omega-3 and omega-6 polyunsaturated fatty acids were associated with a two-fold risk of AMD. But don’t overreact and throw away your walnuts and flaxseeds - the intakes of omega-3 and -6 in this study were highly correlated to one another, making it difficult to discern the effects of one from the other. Also, a 12-year study in the American Journal of Clinical Nutrition last month found that people at high risk for AMD were less likely to develop the disease if they had a greater intake of omega-3 fats. 4  The authors of the current study hypothesized that excessive omega-6 fatty acid intake may influence AMD by promoting inflammation that can contribute to retinal damage. Vegetable oils, processed foods, and animal products contain high levels of omega-6 fats – with that in mind, the authors also stress that the associations that they found likely do not represent effects of only the types of fat, but the cumulative effects of the all the compounds in the foods that contain each type of fat. 3

The evidence is overwhelming that Dr. Fuhrman’s nutritarian diet-style, with raw seeds and nuts as the major fat source, and the high exposure to phytochemicals and carotenoids is the healthiest way to eat. Can you imagine all the personal medical tragedies that could be prevented?    It would sure put a lot of drug companies and doctors out of business.

 

References:

1.http://www.nlm.nih.gov/medlineplus/maculardegeneration.html

2. Parekh N et al. Association Between Dietary Fat Intake and Age-Related Macular Degeneration in the Carotenoids in Age-Related Eye Disease Study (CAREDS). An Ancillary Study of the Women's Health Initiative. Arch Ophthalmol. 2009;127(11):1483-1493.

3.http://www.medpagetoday.com/Ophthalmology/GeneralOphthalmology/16950

4. Sangiovanni JP et al. {omega}-3 Long-chain polyunsaturated fatty acid intake and 12-y incidence of neovascular age-related macular degeneration and central geographic atrophy: a prospective cohort study from the Age-Related Eye Disease Study. Am J Clin Nutr. 2009 Oct 7. [Epub ahead of print]

 

Post a comment
Write a comment:

Related Searches