Anxiety that resolved within the first five years was so unassociated with greater risk that the odds were similar to those without anxiety — a finding that Dr. Glen R. Finney, an American Academy of Neurology fellow, called “a welcome addition to our knowledge about anxiety and dementia.” Finney, director of the Geisinger Memory and Cognition Program in Pennsylvania, wasn’t involved in the study. The results were also largely driven by participants under 70. ”We have known for a long time that stress increases risk for Alzheimer’s disease,” said Dr. Rudolph Tanzi, director of the McCance Center for Brain Health at Massachusetts General Hospital in Boston, who wasn’t involved in the study, via email. “This study agrees with earlier studies that therapy aimed at alleviating anxiety can help reduce risk for (Alzheimer’s disease). But, it’s the size of this study that is particularly compelling.”