Being optimistic could lower the risk of developing dementia by at least 15%, according to a major study from the Harvard T.H. Chan School of Public Health. The findings, published on Wednesday, suggest that a positive outlook may play a significant role in protecting brain health as people age.
The study analysed data from over 9,000 healthy adults aged 50 and older, tracking their cognitive health and optimism levels between 2006 and 2020. Participants' optimism was measured on a six-point scale, and each point increase was associated with a 15% reduction in dementia risk, regardless of age, sex, race, or other health factors.
Researchers believe optimism may lower levels of the stress hormone cortisol and reduce harmful inflammation in the brain, both linked to dementia. “Identifying optimism as a protective psychosocial factor highlights the potential value of optimism in supporting healthy aging,” they wrote in their study.
While the study did not establish a direct cause, it noted that more optimistic individuals tended to be more educated, less likely to smoke, more physically active, and had fewer health conditions. The researchers called for further investigation, given the rising prevalence of dementia and the current lack of effective treatments.
Experts suggest that fostering optimism can be achieved by maintaining a sense of purpose, engaging in meaningful activities, and addressing health concerns. “It’s important to keep older adults engaged and feel that sense of purpose,” said Cindy Woolverton, assistant professor at UTHealth Houston.
