Higher levels of dietary and supplementary calcium intake are associated with a lower risk of progression to late age-related macular degeneration (AMD), according to a secondary analysis of data from a large trial, as reported by Reuters.
Earlier research on the possible association has had mixed results, note Dr. Emily Y. Chew and colleagues at the National Institutes of Health, in Bethesda, Maryland, in JAMA Ophthalmology, online March 21.
“Our retrospective study found no evidence that calcium increases the risk of AMD, which is important because an earlier study had suggested that higher calcium intake increases the risk,” she told Reuters Health by email. “Calcium may even protect against AMD, but we need more research on this point. People who need to take calcium for another medical reason, such as osteoporosis, should know that they are not increasing their risk of AMD by taking the mineral.”