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Longer Estrogen Exposure Linked to Less Blood Vessel Damage in Women's Brains Later in Life
ScienceAlert • • health
Key Points:
- A new study published in Neurology suggests that fluctuations in estrogen levels throughout a woman's life may cumulatively affect cerebrovascular health and brain aging, potentially explaining women's higher risk of Alzheimer's disease.
- Researchers found that women with longer reproductive periods and those who used menopausal hormone therapy showed fewer signs of small blood vessel disease in the brain at age 70, indicating better cerebrovascular integrity.
- The study involved 352 healthy Swedish women born in 1944, using MRI scans and self-reported reproductive histories as proxies for lifetime estrogen exposure, but did not directly measure hormone levels.
- Hormone therapy was linked to greater cortical thickness in brain regions vulnerable to Alzheimer's among women carrying the APOE-ε4 gene variant, though no such association was found in women without this genetic risk factor.
- As an observational study with a limited cohort, the findings do not establish causation and cannot currently support hormone therapy for dementia prevention; further research is needed to clarify estrogen's long-term impact on brain health.
