David PerlmutterPresident,, Perlmutter Health Center · Board-Certified Neurologist | Functional Medicine Pioneer | #1 New York Times Best-Selling Author | International Speaker | Host of The Empowering Neurologist Podcast

What Researchers Are Learning About Menopause and the Brain

19 Dec 2025 · 2 min

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1:30

In this brief presentation, the speaker highlights the striking gender disparity in Alzheimer's disease, noting that women are about twice as likely as men to develop the condition. While chromosomal differences (XX vs. XY) have been explored, recent research emphasized in a Harvard Gazette article focuses on hormonal changes during menopause. Specifically, the abrupt drop in estradiol (E2), a form of estrogen, appears to target neuronal synapses, marking them for immune clearance. This immune‑mediated synapse loss is proposed as a central mechanism linking menopause‑related estradiol decline to the heightened Alzheimer's risk in women. The speaker signals that this line of inquiry will be discussed further in the "Brain Defenders" series.

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Women are nearly twice as likely to develop Alzheimer's disease in comparison to men. That's pretty darn compelling. There are a lot of implications of that in terms of research, but let me just say that researchers have been looking at this disparity for quite some time and have focused on a variety of issues, certainly chromosomal issues. Women have 2 X chromosomes, men have XY chromosomes, but the other issue that's certainly of concern, or at least focus in terms of research, is the changes that happen in a woman's body at the time of menopause. We know that there is a sudden and pretty dramatic drop in estradiol, a type of estrogen, E2, and it's thought that that may play a role. I'm going to get back to that in just one second. A new study that has just come out in the Harvard Gazette, you'll see a link to it, titled Why Are Women Twice as Likely to Develop Alzheimer's as Men? Again, focuses on this disparity. And what we will be writing about in Brain Defenders is interesting research that looks at how a lower level of estradiol that occurs at the time of menopause targets the synapse, the connection between neurons, and labels them such that the immune system then sees that as something to digest away. So loss of synapses brought about by a drop in estradiol, a form of estrogen, may actually be front and center in terms of explaining this risk, why women are more likely to be Alzheimer's patients in comparison to men.