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News
If your spouse gets dementia, your own risk may follow. A large Taiwanese cohort study found that married adults whose spouses developed dementia were roughly 70% more likely to develop dementia themselves — with the relative risk highest among younger adults. The findings suggest dementia risk isn't just individual — it may run through households.
A nationwide cohort study out of Taiwan — published in JAMA Network Open — found that married adults whose spouses developed dementia faced a dramatically elevated risk of developing dementia themselves. Using data from Taiwan's National Health Insurance Research Database (1998–2022), researchers tracked over 955,000 married individuals, comparing those with a spouse diagnosed with dementia against matched controls.
The elevated risk held across dementia subtypes — including Alzheimer's disease and vascular dementia — and was consistent for both men and women. Younger adults showed the strongest relative risk, while older adults faced larger absolute risk differences due to higher baseline dementia rates. Higher income and having more children were associated with somewhat smaller absolute risk differences.
By the Numbers:
Why it matters: These findings challenge the view of dementia as a purely individual condition. Shared environments, caregiving stress, and lifestyle factors may all contribute — pointing toward a household-level approach to dementia screening and support.
