Researchers Map Menopause-Related Blood Protein Changes Associated With Brain Health

Could menopause leave a biological signature in the blood that offers clues about a woman's future brain health? A new study suggests that hormonal changes during menopause are associated with shifts in blood proteins involved in inflammation, brain cell communication and ageing, potentially helping researchers better understand cognitive decline and Alzheimer's disease risk.

Published in Nature Medicine, the multi-cohort study conducted by researchers from the University of Toronto, University of California San Francisco and collaborating institutions investigated how menopause-related molecular changes relate to cognitive ageing.

Researchers initially analysed blood samples from 80 women aged 43 to 58 years, including premenopausal, perimenopausal and postmenopausal participants, alongside 36 age-matched men.

The findings revealed changes in 16 proteins associated with inflammation, nerve cell connections, metabolism and Alzheimer's-related biological processes.

Importantly, these protein changes were more strongly associated with reproductive hormone levels, particularly follicle-stimulating hormone, than with chronological age.

Researchers subsequently examined blood protein data from 2,814 age-matched women in the UK Biobank, confirming widespread molecular differences associated with menopause.

Further analyses suggested that postmenopausal women showed higher estimated biological ageing across several organs and cell types, including the brain and blood vessels.

To investigate long-term implications, researchers examined additional cohorts involving nearly 12,000 older women.

The findings revealed that women with higher menopause-associated protein scores experienced faster cognitive decline in longitudinal analyses.

Importantly, among 11,059 initially dementia-free women followed for approximately 15.7 years, each one-unit increase in the protein score was associated with a 15% higher relative risk of Alzheimer's dementia.

However, researchers emphasised that these associations do not establish that menopause causes dementia.

The study also did not demonstrate that protein changes measured during midlife directly predict future Alzheimer's disease.

Further longitudinal studies are needed to determine whether these molecular changes can reliably predict cognitive decline or guide preventive interventions.

REFERENCE: Wood Alexander, M., Rabin, J.S., Caunca, M. et al. Blood proteomics of menopause map to brain aging and dementia risk. Nat Med (2026). https://doi.org/10.1038/s41591-026-04648-4