Estradiol, the primary form of estrogen, plays a significant role in blood sugar regulation. It enhances insulin sensitivity by promoting glucose uptake in muscle and adipose tissue and suppressing hepatic gluconeogenesis. In premenopausal women, estradiol contributes to stable glycemic control; its decline during menopause is linked to increased insulin resistance and higher type 2 diabetes risk. In men, estradiol (derived from testosterone via aromatase) also modulates insulin sensitivity, though the effects are less pronounced. Evidence is human-observational and mechanistic; large RCTs specifically targeting estradiol's effect on blood glucose are lacking. The relationship is confounded by age, body composition, and other hormones. Caveat: Estradiol-based hormone therapy may improve insulin sensitivity in postmenopausal women but carries risks (e.g., thromboembolism). Do not use estradiol supplements for blood sugar control without medical supervision.
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