Your dementia risk is higher if your spouse has it – but it’s more than shared lifestyle

When one spouse develops dementia, the other faces a significantly higher risk of the same diagnosis. That's the finding from a large-scale study conducted in Taiwan, which tracked nearly one million married adults over two decades. Researchers found that women whose partners developed dementia had roughly a seventy-four percent higher relative risk of developing dementia themselves; for men, the increase was sixty-nine percent. But per The Conversation, here's what makes the finding intriguing: the elevated risk persisted even after researchers accounted for shared lifestyle and medical factors. Rather than a story about couples simply adopting each other's habits, the research points to something more subtle—decades of shared environments, accumulated stress, and the compounding weight of life choices and circumstances that shape brain health over the long term.

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