Dementia Risk May Be Shared Between Spouses

Partners in Memory: Marriage means sharing meals, routines, and decades of life together. New research suggests couples may also share something less expected — and less fun: dementia risk.

The Study: Researchers analyzed health records from nearly one million married adults in Taiwan and found that people whose spouse developed dementia were more likely to develop it themselves. Compared with people whose spouses remained dementia-free, women had a 74% higher relative risk and men had a 69% higher relative risk of developing the disease. Shared lifestyle habits may explain part of the connection, but researchers say they’re not the whole story. Couples also tend to share similar education, income, and health behaviors, and caring for a spouse with dementia can bring years of chronic stress, poor sleep, depression, and social isolation — all factors linked to cognitive decline. The association was somewhat weaker among people with higher incomes or more children, suggesting that additional financial or caregiving support may help buffer the burden.

The Takeaway: Dementia isn’t contagious, but its effects can ripple through a household. Whenever possible, cognitive health should become a priority for both spouses, including regular exercise, good sleep, social connection, and mental stimulation.

Keep In Mind: These findings identify an association, not a cause-and-effect relationship. Additionally, studies in other populations will also be needed to confirm whether the findings apply beyond Taiwan.