Brain Energy Decline in Perimenopause Linked to Alzheimer's Risk

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Research by neurologist Lisa Mosconi at Cornell, cited by Dr. Sara Gottfried, shows that starting around age 40, the female brain undergoes roughly a 20% decline in glucose uptake (how efficiently brain cells use fuel), measurable on specialized brain scans. Women who experience the most severe hot flashes and night sweats show the greatest degree of this "cerebral hypometabolism" — meaning the brain is running on less energy. Gottfried argues this pattern maps onto Alzheimer's disease risk, and that declining estrogen beginning around age 43 appears to be a primary driver, because the brain's energy system is regulated in part by estrogen. She warns that conventional medicine treats hot flashes and night sweats as nuisance symptoms, but they are actually biomarkers of cardiometabolic disease, bone loss, and brain changes — and women in their 40s and 50s should discuss hormone therapy with this broader context in mind, not wait until symptoms are severe.