Health
Large observational study links hormone replacement therapy to lower dementia risk
Researchers analyzing UK Biobank data found postmenopausal women using HRT had a lower incidence of dementia, though the study cannot prove direct causality.
The short version
- A study of over 180,000 postmenopausal UK women found that HRT users had a 10% lower risk of developing any form of dementia and a 16% lower risk of Alzheimer's compared to non-users.
- The risk reduction was highest among women who underwent surgical menopause (26%) and those carrying the Apoe4 genetic risk variant.
- Because the study relies on observational data, researchers noted it cannot establish a direct causal link between HRT use and dementia prevention.
- Health experts recommend that individuals consult their general practitioner before starting or stopping HRT while further research determines if the therapy itself causes the reduced risk.
Key facts
- Researchers at the University of East Anglia analyzed data from 183,450 postmenopausal women in the UK Biobank over an average tracking period of 13 years, identifying nearly 4,000 dementia cases.[The Guardian]
- Women who used HRT for at least one year were 10% less likely to develop any dementia and 16% less likely to develop Alzheimer's disease.[The Guardian]
- Women undergoing surgical menopause showed a 26% lower risk of dementia when using HRT compared to non-users.[The Guardian]
- The study was published in the peer-reviewed journal Alzheimer's & Dementia.[The Guardian]
What remains uncertain
- Because the findings are based on observational data rather than a randomized controlled trial, researchers cannot establish whether HRT directly causes the reduction in dementia risk or if unmeasured lifestyle and socioeconomic differences influenced the outcome.[The Guardian]
Sources
- Women using HRT at lower risk of dementia, study suggestsThe Guardian - World