A large US study linked higher levels of optimism in older adults to a lower risk of dementia. Every six-point increase on a standard optimism scale corresponded to a 15% reduction in the likelihood of developing the condition. The association held after adjusting for age, gender, ethnicity, education, depression, chronic illnesses, mental health, and lifestyle. The pattern persisted when the first two years of follow-up were excluded to reduce the chance that early, undetected dementia influenced mood or outlook. In shorter analyses covering six to seven years, a similar relationship also appeared.
The study was led by Harvard University researchers and published in the Journal of the American Geriatrics Society. It analyzed data from 9,071 cognitively healthy US adults aged 50 and older who were followed for up to 14 years. The average age at baseline was about 73–74. Over 3,000 participants developed dementia during the observation period, but rates were lower among those reporting greater optimism at the outset.
To identify dementia cases consistently across racial and ethnic groups and over time, the investigators used a specific algorithm applied to multiple data collection waves from 2006 to 2020. The main findings were similar across subgroups, including among non-Hispanic White and Black participants. Excluding the initial two years of follow-up did not change the overall pattern, addressing concerns that preclinical dementia might influence mood or attitude.
The authors described optimism as a protective psychosocial factor that may promote healthy aging and help maintain cognitive health.
The researchers suggested that one way optimism could be tied to lower dementia risk is through behavior. People with a more positive outlook may be more likely to engage in regular exercise and avoid smoking, which could contribute to better brain health over time. More broadly, the team noted that mental perspectives can have a positive impact on health outcomes: optimistic individuals tend to experience fewer cardiovascular diseases and have higher life expectancy.
The researchers indicated that diet, exercise, and social engagement remain critical, with the practical aim being to “put the odds in your favor that you’ll be less likely to develop one of these conditions, or at least delay the onset of symptoms.”
Source:
www.jpost.com
