Crosswords and chess may help more than socializing in avoiding dementia

Computer use, crosswords and games like chess are more strongly associated with older people avoiding dementia than knitting, painting or socializing, a Monash University study has found.

Published in JAMA Network Open, the findings—some of the most robust on this topic to date—may help older individuals and aged care professionals plan more targeted approaches to reducing dementia risk.

Researchers drew data from 10,318 Australians aged 70 and older participating in the ASPREE project and the ALSOP (ASPREE Longitudinal Study of Older Persons) sub-study.

They found that participants who routinely engaged in adult literacy and mental acuity tasks such as education classes, keeping journals, and doing crosswords were 9-11 percent less likely to develop dementia than their peers.

Creative hobbies like crafting, knitting and painting, and more passive activities like reading reduced the risk by 7 percent. In contrast, the size of someone's social network and the frequency of external outings to the cinema or restaurant were not associated with dementia risk reduction.

The results remained statistically significant even when adjusted for earlier education level, and socioeconomic status. No significant variations were found between men and women.

In 2022, 55 million people globally lived with dementia, with 10 million new cases each year.

Senior author Associate Professor Joanne Ryan, from the School of Public Health and Preventive Medicine, said identifying strategies to prevent or delay dementia was a huge global priority.

"We had a unique opportunity to close a gap in knowledge by investigating a broad range of lifestyle enrichment activities that older adults often undertake, and assess which of those were most strongly aligned with avoiding dementia," Associate Professor Ryan said.

"I think what our results tell us is that active manipulation of previously stored knowledge may play a greater role in dementia risk reduction than more passive recreational activities. Keeping the mind active and challenged may be particularly important."

The leisure activities assessed encompassed:

• adult literacy activities such as adult education classes, using computers, keeping a journal

• mental acuity tasks like completing quizzes and crosswords, playing cards/chess

• creative hobbies like woodworking, knitting or painting

• more passive activities like keeping up with the news, reading or listening to music

• social network activities like meeting and interacting with friends

• planned excursions such as going to a restaurant, museum or the cinema.

Associate Professor Ryan said the results did not rule out that those naturally drawn to the types of leisure activities linked to cognitive health also had specific personality traits that were otherwise beneficial, or they may generally have had better health behaviors.

"While engaging in literacy and mental acuity activities may not be a magic pill to avoid dementia, if that was your goal and you had to choose, our research certainly suggests these are the activities most likely to support prolonged good cognitive health," she said.

Associate Professor Ryan said social connection may also still be quite important to cognitive health and mental well-being, even though it did not show a clear link with dementia risk in the study.

"The participants were cognitively healthy, and were likely already leading socially active lives, such that the cognitive benefits of strong social networks may be less obvious in this group compared to the general public," she said.

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