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How common is Alzheimer’s? Blood-test study holds surprises

A survey of Alzheimer’s disease prevalence in Norway confirms earlier estimates and might show how education level relates to risk.
By
  1. Asher Mullard

    1. Asher Mullard is a science journalist based in Ottawa.

Nearly one in ten people over the age of 70 have Alzheimer’s disease dementia, shows a first-of-its-kind study that paired blood-based markers and clinical assessments to study the disease in Norway1.

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Nature 649, 14 (2026)

doi: https://doi.org/10.1038/d41586-025-04133-x

References

  1. Aarsland, D. et al. Nature https://doi.org/10.1038/s41586-025-09841-y (2025).

    Article  Google Scholar 

  2. Rajan, K. B. et al. Alzheimers Dement. 17, 1966–1975 (2021).

    Article  PubMed  Google Scholar 

  3. Gustavsson, A. et al. Alzheimers Dement. 19, 658–670 (2022).

    Article  PubMed  Google Scholar 

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