What role does Östradiol play in longevity?

The role of estradiol in longevity is complex and context-dependent. Estradiol, the primary female sex hormone, exerts both protective and potentially harmful effects. In premenopausal women, it is associated with favorable cardiovascular profiles, higher bone density, and better cognitive function, which may contribute to lower all-cause mortality. After menopause, estradiol levels drop sharply, correlating with increased risks of osteoporosis, cardiovascular disease, and cognitive decline. Hormone replacement therapy (HRT) can mitigate these risks, but evidence from randomized trials (e.g., WHI) is mixed: early initiation may be cardioprotective, while late initiation raises risks of breast cancer, stroke, and thrombosis. The evidence level is 'human-moderate' because observational and mechanistic data exist, but no definitive long-term intervention trials directly link estradiol to extended lifespan. Additionally, effects vary by genetic background (e.g., ESR1 variants) and lifestyle. A direct causal effect of estradiol on maximum lifespan is not established. For individual health optimization, general measures (healthy diet, exercise, risk factor management) are more impactful than focusing solely on estradiol levels.