Alzheimer’s may leave a mark on the brain long before plaques appear Brain changes associated with Alzheimer’s may begin at least seven years before amyloid plaques become detectable with current PET scans. Researchers uncovered the signal by tracking healthy older adu... Read more: https://worldnewsguru.us/science-news/alzheimers-may-leave-a-mark-on-the-brain-long-before-plaques-appear Originally published on World News Guru