Last Updated: 2/17/2006
Reduce Your Risk of Vision Loss From Macular Degeneration
Find Out Which Foods and Supplements Will Help
Chris A. Knobbe, M.D.
Assistant Clinical Professor
University of Texas Southwestern Medical Center - Dallas
Age related macular degeneration (AMD) is associated with a slowly progressive deterioration of central vision for which there is no cure. It is the leading cause of irreversible vision loss among the elderly. The condition may lead to severe loss of central acuity, such that the affected may lose ability read, drive a vehicle, or recognize familiar faces. However, as in many disease states, prevention may be possible and every person with AMD or at risk for AMD should understand the basic principles.
There are a number of risk factors for AMD, including genetic inheritance, advancing age, smoking, and high blood pressure. Unfortunately, many people that get AMD or are at risk for the disease don’t have any risk factors that are under their control, except possibly one: nutrition. In this article, we’ll review two landmark studies linking nutrition to AMD and we’ll provide specific nutritional advice to those with AMD as well as those at risk for the disease.
Ophthalmologists and vision scientists at the Massachusetts Eye and Ear Infirmary published the results of a study investigating the relationship between dietary factors and AMD in the Journal of the American Medical Association in November, 1994. This study found that
individuals who had the highest consumption of vegetables rich in carotenoids (lutein and zeaxanthin) had a 43% lower risk of developing AMD than those who ate these foods the least.
Vegetables rich in carotenoids include dark, leafy green vegetables, especially raw spinach, kale, and collard greens. As stated by the investigators in this study, “in particular, a higher frequency of intake of spinach or collard greens was associated with a substantially lower risk for AMD”. The authors stated, at the conclusion of the study, that “consumption of foods rich in certain carotenoids, in particular dark green, leafy vegetables, may decrease the risk of developing advanced or exudative (“wet”) AMD, the most visually disabling form of macular degeneration among older people”.
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VisiVite advanced macular degeneration formulas add Lutein and Zeaxanthin for improved retinal and visual health.
A second study investigating nutritional factors and AMD, supported by the National Institutes of Health/National Eye Institute, showed that high levels of antioxidant vitamins and zinc significantly reduced the risk of advanced age-related macular degeneration and its associated vision loss. This study, known as the Age Related Eye Disease Study (AREDS), was truly another landmark study for patients with AMD. The investigators state, “people at high risk of developing advanced stages of AMD, a leading cause of vision loss, lowered their risk by about 25 percent when treated with a high-dose combination of vitamin C, vitamin E, beta-carotene, and zinc”. Interestingly, the participants in the study who had either early AMD or no AMD did not appear to benefit from this antioxidant and zinc regimen.
“This is an exciting discovery because, for people at high risk for developing advanced AMD, these nutrients are the first effective treatment to slow the progression of the disease,” said Paul A. Sieving, M.D., Ph.D., director of the National Eye Institute. “AMD is a leading cause of visual impairment and blindness in American 65 years of age and older. Currently, treatment for advanced AMD is quite limited. These nutrients will delay the progression to advanced AMD in people who are at high risk – those with intermediate AMD in one or both eyes, or those with advanced AMD in one eye already”. Dr. Sieving further states that patients with AMD should understand that there isn’t a cure for AMD and that proper nutrition will not restore vision that is already lost. However, the study results also clearly demonstrate that nutrients play a key role in helping to maintain vision in people at high risk for developing advanced AMD.
The nutrients evaluated in the AREDS study contained 500 milligrams of vitamin C, 400 international units of vitamin E, 15 milligrams of beta-carotene, 80 milligrams of zinc as zinc oxide, and two milligrams of copper as cupric oxide. In this study, the NEI was supported by and collaborated with Bausch and Lomb, an ophthalmic products and pharmaceuticals company that provided the nutritional supplements, financial support for laboratory testing, and distribution of the supplements themselves. Today, these supplements can be found in a formulation called Ocuvite® Preservision™.
What Supplements Should One Take to Prevent AMD Progression? Given the findings of these studies, most ophthalmologists have begun to recommend that patients with AMD include an abundance of leafy green vegetables in their diet. However, many people are unable to include the dark, leafy green vegetables in their diet on a daily or regular basis. In this case, could a whole-food based supplement help? The answer is likely, “yes”.
One supplement that appears particularly well suited for the AMD patient is Juice Plus+®. This whole-food based supplement combines the nutritional essence of seventeen different fruits, vegetables, and grains and provides the supplement in easy to take capsules or gummies.
Juice Plus+® not only contains concentrated extracts from spinach and kale, but also includes key nutritional ingredients from carrots, parsley, beets, broccoli, cabbage, tomato, barley, and oats (in the Garden Blend), as well as apples, oranges, pineapple, cranberries, peaches, acerola cherries, and papaya (in the Orchard Blend).
It is backed by an abundance of independent and ongoing clinical and scientific research.
Juice Plus+® raises the levels of lutein and zeaxanthin significantly in the blood and, interestingly, may do this better than whole foods themselves! Furthermore,
Juice Plus+® raises the levels of multiple antioxidants in the blood, demonstrates reduced levels of lipid peroxides (a measure of oxidative stress) and homocysteine (an indicator of heart disease risk) in the blood, reliably enhances immune function, and reduces DNA (our unique genetic code) damage.
Bausch and Lomb, the maker of Ocuvite®, produces other supplements specific for patients with macular degeneration, including Ocuvite Extra®, and Ocuvite® Lutein. These products are found in retail stores and pharmacies everywhere. Macular Protect Complete® from Science Based Health, Alcon laboratories ICaps™, and other supplements also contain antioxidant vitamins and zinc in dosages supported by the AREDS study group, along with various doses of other vitamins and minerals, which are beyond the scope of this article.
It should be pointed out that supplementation with beta-carotene, a vitamin A precursor, has been shown to increase the risk of lung cancer among smokers. However, whole food based supplementation has not been shown to increase the risk of lung cancer among smokers and, in fact, there is some evidence that whole food based nutrition may decrease the risk of lung cancer in smokers. One study showed that a higher intake of green and yellow vegetables or other food sources of beta-carotene decreased the risk of lung cancer. As such, smokers should exercise caution in consuming any non whole-food based supplement that contains beta-carotene or Vitamin A.
Conclusions It is clear from the studies to date that a diet rich in dark, leafy green vegetables will help to decrease an individual’s risk of developing age-related macular degeneration (AMD). It would be wise to include a serving or two of raw spinach, kale, or collard greens in your diet every day to help prevent macular degeneration and/or to help delay progression of the disease once it has begun. But how many people will be able to follow these dietary recommendations? As such, it appears
wise to supplement the diet with a whole-food based product such as Juice Plus+®. This product may not only decrease an individual’s risk of developing AMD, but it may also delay its progression once it has begun. Juice Plus+® may also decrease risk of cardiovascular disease and cancer as well as enhance immune function.
If an intermediate degree of AMD has already developed, or an advanced degree of AMD has developed in one eye, studies clearly indicate that dietary supplementation with vitamins E and C, beta-carotene, zinc and copper, in the doses previously mentioned, will help to delay progression of the disease. These antioxidant vitamins are readily available in a number of over-the-counter products including Ocuvite®, ICaps™, and many others.
AMD may not be an entirely preventable disease, however, it is certainly prudent for all of us to minimize our risk. How do we do this? Don’t smoke. Be sure your blood pressure is controlled. Consume plenty of dark, leafy green vegetables and/or consider the whole-food based supplement Juice Plus+® along with antioxidant vitamins and zinc.
ReferencesDietary carotenoids, vitamins A, C, and E, and advanced age-related macular degeneration. Eye Disease Case-Control Study Group. JAMA 1994 Nov 9: 272 (18): 1413-20
Age-Related Eye Disease Study Group. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta-carotene and zinc for age-related macular degeneration and vision loss. AREDS Report No. 8. Arch Ophthalm. 2001; 119: 1417-1436.
Current Therapeutic Research. Volume 57, Number 6, June 1996. Changes In Plasma Carotenoid, Alpha-Tocopherol, And Lipid Peroxide Levels In Response To Supplementation With Concentrated Fruit and Vegetable Extracts: A Pilot Study
ÃMeasuring Component/Nutritive Values Contained in NSA’s Juice Plus+â Products “Orchard Blend” and “Garden Blend” Relative to Component/Nutritive Values Contained in Commercial and Fresh-Squeezed Fruit and Vegetable Juices, Feb 24, 1999.
Immune Function Improves During Fruit and Vegetable Extract Supplementation. 1, P Inserra, S Jiang D Solkoff, J Lee, Z Zhen, M Xu, JA Wise, R Hesslink, and RR Watson. Arizona Prevention Center, University of Arizona, Tucson, AZ, 2, Arizona Cancer Center, University of Arizona, Tucson, AZ and 3, Natural Alternatives International, San Marcos, CA.
Supplementation with Fruit and Vegetable Extracts reduces DNA damage in the Peripheral Lymphocytes of an Elderly Population. MJ Smith, 1 PF Inserra, 2 RD Bowden, 1 JA Wise, 3 R Hesslink Jr, 3 RR Watson, 2 and KL O’Neill. 1 Department of Microbiology, Brigham Young University, Provo, UT, 2Arizona Prevention Center, University of Arizona, Tucson, AZ, and 3Natural Alternatives International, San Marcos, CA.
Omenn ˝S, Goodman GE, et al. Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. N Engl J Med. 1996; 334: 1150-1155.
Koo LC. Diet and lung cancer 20+ years later: More questions than answers? Int J Cancer 1997; Suppl 10:22-9.
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