Overview
- The peer‑reviewed analysis, published Wednesday in the Journal of the American Geriatrics Society, finds about a 15% lower dementia risk for each one‑standard‑deviation increase in optimism.
- Researchers tracked 9,071 cognitively healthy older adults in the U.S. Health and Retirement Study for up to 14 years, measuring outlook with the Life Orientation Test–Revised near the first cognitive check.
- Dementia status came from a validated algorithm designed to work across racial and ethnic groups, and the link held after adjusting for demographics, depression, and major health conditions and after dropping the first two years to reduce reverse‑causation concerns.
- Across follow‑up, about 3,027 participants developed dementia, and the protective association appeared similar in Non‑Hispanic White and Black subgroups.
- The study cannot prove cause, but researchers note optimism is partly learnable through approaches such as cognitive behavioral therapy and gratitude practice, which could guide low‑cost prevention trials.