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When we think about menopause, we usually think about hot flushes or hormonal changes.

But one of the biggest changes happens somewhere we can't see: the brain's energy supply.

The brain consumes around 20% of the body's energy, and that energy depends on mitochondria. Research now suggests this system is closely regulated by ovarian hormones.

Experimental studies show that estrogen and progesterone help maintain mitochondrial respiration, support electron transport chain activity, and reduce oxidative stress. When these hormones decline, brain mitochondria become less efficient at producing energy.

Human brain imaging tells a similar story.

During the menopausal transition, women show reduced glucose metabolism in brain regions that are particularly vulnerable in Alzheimer's disease. Importantly, these metabolic changes are linked more closely to reproductive stage than to chronological age alone. Some studies have even detected these energetic shifts alongside early amyloid-β deposition and structural brain changes before clinical symptoms appear.

This doesn't mean menopause causes Alzheimer's disease.
It does suggest that the menopausal transition represents a period of altered brain bioenergetics one: that may increase vulnerability in some women and deserves much greater attention.

Understanding how hormones shape mitochondrial function could help explain why Alzheimer's disease affects women differently, and why the biology of aging cannot be understood by studying one sex alone.

#Neuroscience #Mitochondria #Menopause #AlzheimersDisease #BrainHealth #WomenHealth #Neurobiology