The Age-Related Eye Disease Studies (AREDS and AREDS2) establish that dietary supplements can slow the progression of age-related macular degeneration. AMD is the most common cause of blindness in older Americans today. A new report, analyzed 10 years of AREDS2 data by scientists. It shows that the AREDS2 formula, which substitutes the antioxidants lutein and zeaxanthin for beta-carotene. It not only reduces risk of lung cancer due to the beta-carotene, but is also much more effective at reducing the risk of AMD progression, compared to the original formula. The report on the study, funded by the National Institutes of Health, was published in JAMA Ophthalmology.
Changes in New Supplement Formula
“This 10-year data confirms that not only is the new formula safer, it’s actually better at slowing AMD progression.”
says, Emily Chew, M.D., director of the Division of Epidemiology and Clinical Application at the National Eye Institute (NEI).
The original 1996 AREDS study showed that a dietary supplement formulation of 500 mg vitamin C, 400 international units vitamin E, 2 mg copper, 80 mg zinc, and 15 mg beta-carotene, could significantly slow the progression of AMD from moderate to late disease. However, there are two concurrent studies that also reveal that people who smoked and took beta-carotene had a significantly higher risk of lung cancer than expected.
Because beta-carotene increased the risk of lung cancer for current smokers in two NIH-supported studies, our goal with AREDS2 was to create an equally effective supplement formula that could be used by anyone, whether or not they smoke. At the end of the five-year AREDS2 study period, the researchers concluded that lutein and zeaxanthin did not increase risk for lung cancer, and that the new formation could reduce the risk of AMD progression by about 26%. After the completion of the five-year study period, the study participants were all offered the final AREDS2 formation that included lutein and zeaxanthin instead of beta-carotene.
In this new report, the researchers followed up with 3,883 of the original 4,203 AREDS2 participants an additional five years from the end of the AREDS2 study in 2011, collecting information on whether their AMD had progressed to late disease, and whether they had been diagnosed with lung cancer. Even though all the participants had switched to the formula containing lutein and zeaxanthin after the end of the study period, the follow up study continued to show that beta-carotene increased risk of lung cancer for people who had ever smoked by nearly double. There was no increased risk for lung cancer in those receiving lutein/zeaxanthin. In addition, after 10 years, the group originally assigned to receive lutein/zeaxanthin had an additional 20% reduced risk of progression to late AMD compared to those originally assigned to receive beta-carotene.
“These results confirmed that switching our formula from beta-carotene to lutein and zeaxanthin was the right choice,”
said Chew.
AMD is a degenerative disease of the retina, the light-sensitive tissue at the back of the eye. Progressive death of retinal cells in the macula, the part of the retina that provides clear central vision, eventually leads to blindness. Treatment can slow or reverse vision loss; however, no cure for AMD exists.
For more helpful eye care and vision care tips, please visit our main blog page.
Sources:
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