FILE - In this Feb. 6, 2012, file photo, Alexis McKenzie, right, executive director of The Methodist Home of the District of Columbia Forest Side, an Alzheimer's assisted-living facility in Washington, puts her hand on the arm of a resident. In a study published by the Journal of the American Medical Association on Tuesday, Dec. 31, 2013, researchers report that vitamin E might slow the progression of mild to moderate Alzheimer's disease. The study of more than 600 older veterans, sponsored by the U.S. Department of Veterans Affairs, shows high doses of the vitamin delayed the decline in daily living skills, such as making meals, getting dressed and holding a conversation, by about six months over a two-year period. (AP Photo/Charles Dharapak, File)