{"id":6011,"date":"2015-08-31T05:42:22","date_gmt":"2015-08-31T05:42:22","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=6011"},"modified":"2015-08-31T05:42:22","modified_gmt":"2015-08-31T05:42:22","slug":"vitamin-d-may-play-key-role-in-preventing-macular-degeneration","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/vitamin-d-may-play-key-role-in-preventing-macular-degeneration\/","title":{"rendered":"Vitamin D May Play Key Role in Preventing Macular Degeneration"},"content":{"rendered":"
\"bt1508_buffalo_amy-millen\"<\/a>
Amy Millen, associate professor of epidemiology and environmental health in the University at Buffalo’s School of Public Health and Health Professions, is lead author on a paper published Aug. 27 in JAMA Ophthalmology.<\/figcaption><\/figure>\n

Vitamin D has been studied extensively in relation to bone health as well as cancer. Now, a team led by a researcher at the University at Buffalo has discovered that vitamin D may play a significant role in eye health, specifically in the possible prevention of age-related macular degeneration, or AMD, among women who are more genetically prone to developing the sight-damaging disease.<\/span><\/p>\n

In a paper published Aug. 27 in\u00a0JAMA Ophthalmology<\/em>\u00a0online, Amy Millen, associate professor of epidemiology and environmental health in UB\u2019s School of Public Health and Health Professions, and her team found that women who are deficient in vitamin D and have a specific high-risk genotype are 6.7 times more likely to develop AMD than women with sufficient vitamin D status and no high risk genotype.<\/span><\/p>\n

\u201cMost people have heard that you should eat carrots to help your vision. However, there appear to be many other ways that adequate nutrition can support eye health. Having adequate vitamin D status may be one of them,\u201d said Millen, Ph.D., the study\u2019s lead author. \u201cThis is not a study that can, alone, prove a causal association, but it does suggest that if you\u2019re at high genetic risk for AMD, having a sufficient vitamin D status might help reduce your risk.\u201d<\/span><\/p>\n

[pullquote]Vitamin D shows promise for protecting against macular degeneration because of its anti-inflammatory and antiangiogenic properties; antiangiogenic refers to slowing the growth of new blood vessels, often seen in late stages of AMD.[\/pullquote]<\/p>\n

\u201cTo our knowledge, this is the first study that\u2019s looked at the interaction between genetic risk and vitamin D status in the context of age-related eye disease,\u201d adds Millen.<\/span><\/p>\n

Macular degeneration is characterized by the deterioration of the macula, a small part of the central retina where the eye\u2019s photoreceptors (rods and cones) are most highly concentrated. The leading cause of legal blindness, macular degeneration affects more than 10 million Americans \u2014 more than cataracts and glaucoma combined \u2014 according to the American Macular Degeneration Foundation. The disease affects a person\u2019s central vision, which is needed for common tasks such as reading and driving. The effect is similar to that of a rain drop on the center of a camera lens.<\/span><\/p>\n

Researchers analyzed data compiled on 1,230 women ages 54 to 74 who participated in the Carotenoids in Age-related Eye Disease Study (CAREDS), which is an ancillary study of the Women\u2019s Health Initiative (WHI) Observational Study (OS). The WHI OS is a major National Institutes of Health-funded research program aimed at addressing the most common causes of death, disability and poor quality of life in postmenopausal women. UB is one of 40 WHI centers nationally. CAREDS was conducted among participants at three of the centers: University of Wisconsin (Madison), the University of Iowa (Iowa City) and the Kaiser Center for Health Research (Portland, Oregon).<\/span><\/p>\n

Researchers were able to determine participants\u2019 vitamin D status by analyzing serum samples for a vitamin D biomarker, 25-hydroxyvitamin D [25(OH)D], which provided a glimpse into vitamin D intake through all sources: diet, supplements and sunlight.<\/span><\/p>\n

Human skin can synthesize vitamin D when exposed to ultraviolet light, Millen explains. However, for many people, 15 to 30 minutes a day with 10 percent of their skin exposed might be sufficient. In winter months, when there is a lower solar angle, sun exposure may not be not sufficient to maintain blood level for people who live north of a line from about Washington, D.C., to Los Angeles. At these times and locations, dietary intake may be needed. Dietary sources of vitamin D include fortified foods such as milk and foods that naturally contain vitamin D such as fatty fish like salmon and mackerel.<\/span><\/p>\n

\u201cMacular degeneration has been found to be strongly associated with genetic risk,\u201d Millen said. Among many genes linked to AMD, one of the strongest is a specific genetic variant (Y402H) in the complement factor H gene, called CFH for short. This gene codes for the CFH protein that is involved in the body\u2019s immune response to destroy bacteria and viruses.<\/span><\/p>\n

Inflammation is believed to be involved in the development of macular degeneration. \u00a0<\/span><\/p>\n

\u201cPeople who have early stage AMD develop drusen, lipid and protein deposits that build up in the eye. Your body sees this drusen as a foreign substance and attacks it, in part via the complement cascade response,\u201d explains Millen. \u201cCFH is one of the proteins involved in this response. We see more AMD in people who have certain variants in the gene which encodes a form of this CFH protein that is associated with a more aggressive immune response.\u201d<\/span><\/p>\n

Vitamin D shows promise for protecting against macular degeneration because of its anti-inflammatory and antiangiogenic properties; antiangiogenic refers to slowing the growth of new blood vessels, often seen in late stages of AMD.<\/span><\/p>\n

\u201cOur thinking was, if a person\u2019s vitamin D status is better, would it reduce the immune response to drusen? We wanted to understand if the association between vitamin D and AMD differed depending on a person\u2019s genetic risk for AMD,\u201d said Millen. \u201cOur study suggests that being deficient for vitamin D may increase one\u2019s risk for AMD, and that this increased risk may be most profound in those with the highest genetic risk for this specific variant in the CFH protein.\u201d<\/span><\/p>\n

The study results, however, shouldn\u2019t prompt people to run to the nearest grocery store to purchase vitamin D supplements.<\/span><\/p>\n

\u201cOur message is not that achieving really high levels of vitamin D are good for the eye, but that having deficient vitamin D levels may be unhealthy for your eyes,\u201d Millen said.<\/span><\/p>\n

Although the odds of having AMD was higher in women who were deficient for vitamin D, with 25(OH)D levels below 12 ng\/mL (30 nmol\/L), increasing vitamin D levels beyond 12 ng\/mL did not further lower the odds of AMD to any meaningful extent, she explains.<\/span><\/p>\n

\u201cThis study supports a role for vitamin D in eye health. That\u2019s significant because when the Institute of Medicine\u2019s report on the dietary reference intakes for vitamin D and calcium were released in 2011, the committee could only make conclusions about D related to bone health,\u201d said Millen. \u201cThere wasn\u2019t enough evidence at that time to make any recommendation based on D status and other outcomes beyond bone health.\u201d<\/span><\/p>\n

The study was funded by the National Eye Institute of the National Institutes of Health.<\/span><\/p>\n

Source: University at Buffalo<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Now, a team led by a researcher at the University at Buffalo has discovered that vitamin D may play a significant role in eye health, specifically in the possible prevention of age-related macular degeneration, or AMD, among women who are more genetically prone to developing the sight-damaging disease.<\/p>\n","protected":false},"author":6,"featured_media":6012,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,17],"tags":[],"class_list":["post-6011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-medicine","category-research"],"featured_image_urls":{"full":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",900,600,false],"thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen-150x150.jpg",150,150,true],"medium":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen-300x200.jpg",300,200,true],"medium_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",750,500,false],"large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",750,500,false],"1536x1536":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",900,600,false],"2048x2048":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",900,600,false],"ultp_layout_landscape_large":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",900,600,false],"ultp_layout_landscape":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",855,570,false],"ultp_layout_portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",600,400,false],"ultp_layout_square":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",600,400,false],"newspaper-x-single-post":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",735,490,false],"newspaper-x-recent-post-big":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",540,360,false],"newspaper-x-recent-post-list-image":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",95,63,false],"web-stories-poster-portrait":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",640,427,false],"web-stories-publisher-logo":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",96,64,false],"web-stories-thumbnail":["https:\/\/www.revoscience.com\/en\/wp-content\/uploads\/2015\/08\/bt1508_buffalo_amy-millen.jpg",150,100,false]},"author_info":{"info":["Amrita Tuladhar"]},"category_info":"Medicine<\/a> Research<\/a>","tag_info":"Research","comment_count":"0","_links":{"self":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/6011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/comments?post=6011"}],"version-history":[{"count":0,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/posts\/6011\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media\/6012"}],"wp:attachment":[{"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/media?parent=6011"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/categories?post=6011"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.revoscience.com\/en\/wp-json\/wp\/v2\/tags?post=6011"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}