How are BDNF and menopause related?

BDNF (Brain-Derived Neurotrophic Factor) is crucial for neuronal survival and plasticity. Estrogen regulates BDNF expression via estrogen receptor-β. During menopause, estrogen levels drop sharply, which can reduce BDNF concentrations in the brain and blood. Studies link lower BDNF to cognitive decline, memory issues, and increased depression risk during menopause. Hormone replacement therapy (HRT) may partially restore BDNF levels. However, evidence is moderate: many studies are observational or small-scale. Effects also depend on HRT timing (the 'timing hypothesis'). BDNF blood tests are not standardized and do not directly reflect brain levels. In summary, BDNF is an important mediator between estrogen and brain health, but not a standalone biomarker for menopausal symptoms. Lifestyle factors like exercise and diet also strongly influence BDNF.