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Activity, Sleep Tied to Dementia Risk

Meta-analysis links higher activity, less sitting, and 7 to 8 hours of sleep with lower incident dementia risk, though findings vary widely across studies.

  • By

  • Kathryn Wighton

  • April 28, 2026

  • 3 min

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  • 1

    Higher physical activity levels and less sedentary time are linked to a lower risk of incident dementia according to a systematic review.

  • 2

    Participants engaging in 150 minutes or more of physical activity weekly had a 25% lower risk of developing dementia.

  • 3

    Sedentary behavior of 8 hours or more daily was associated with a 27% higher risk of dementia, though based on limited studies.

  • 4

    Sleeping less than 7 hours or more than 8 hours per night increased dementia risk by 18% and 28%, respectively.

  • 5

    The study emphasizes that findings are associative, not causal, due to biases and observational design limitations.

Original Source(s)

Activity, Sleep Tied to Dementia Risk

  • by Kathryn Wighton

  • April 28, 2026

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