NEW YORK (Reuters Health) - The carbohydrates present in a diet can influence the risk of age-related macular degeneration (AMD), the most common cause of vision loss in older adults, according to a report in the American Journal of Clinical Nutrition."AMD appears to share several carbohydrate-related mechanisms and risk factors with diabetes-related diseases, including (eye) and cardiovascular disease,” write Dr. Allen Taylor, of Tufts University, Boston, and colleagues. “However, to date, only one small study has addressed this issue.”