(VIDEO) University of California - Davis Health This video is under embargo. Please login to access this video. Caption An important new study of diverse communities is looking at how brain changes, genetics and other factors contribute to dementia and Alzheimer’s disease. The results could affect millions. Among people 65 and older, about 1 in 9 has Alzheimer’s disease. Credit UC Davis Health Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.