Many women experience cognitive and neurological changes as they approach midlife and the menopausal transition. Memory feels less reliable. Focus slips more easily. Sleep becomes fragmented. Words sit just out of reach.
These symptoms are common, but often poorly explained, leaving many to wonder: Is this normal, temporary, or a sign that something is wrong?
To understand what may be happening, we need to look beyond symptoms and toward biology.
During perimenopause—the years leading up to menopause—estrogen levels do not decline in a smooth, predictable way. Instead, they fluctuate widely, often exceeding premenopausal levels at times before ultimately falling. Then, at menopause itself, ovarian estrogen production drops sharply and permanently—one of the most abrupt endocrine shifts in a woman’s lifetime.
While we often talk about estrogen’s role in reproduction, it also plays a central role in brain function. Estrogen signaling supports communication between brain networks, regulates glucose metabolism in neurons, influences cerebral blood flow, and helps maintain homeostasis, including regulating body temperature and appetite. The brain has functioned in an estrogen-rich environment since puberty, so when estrogen levels fluctuate then fall, the brain must recalibrate to a new hormonal reality.
Given estrogen’s well-established role in brain physiology, it’s not surprising that this transition is associated with neurological symptoms, such as mood changes, brain fog, and vasomotor symptoms like hot flashes and night sweats. But this leaves us with a critical question: What is actually happening in the brain during this time?
Until relatively recently, we had limited in vivo human data to answer that question.
One important study helped fill that gap: Using multiple brain imaging modalities, researchers examined structural and metabolic changes occurring in women’s brains across the menopausal transition.1
Though based on a single, still relatively early dataset, the findings add biological clarity to changes women have long reported during the menopausal transition.
A brain in transition
To examine how menopause affects brain structure, researchers used multimodal MRI to assess gray and white matter volume and white matter integrity in cognitively healthy women (n=161) aged 40–65. Participants were classified as pre-, peri-, or post-menopausal based on hormone status and menstrual cycle patterns. A minority of women in the study had ever used hormone therapy (0% of premenopausal, 15% of perimenopausal, and 36% of postmenopausal women were current or past hormone therapy users). Age-matched male controls were included to help distinguish hormonal effects from normal chronological aging.
Women transitioning through menopause showed reductions in brain volume in regions involved in memory, attention, and higher-order cognitive processing. These changes were not uniform: Some regions were most affected during perimenopause, while others showed differences later, in postmenopause. These patterns were distinct from those seen in male controls, suggesting the changes were not solely explained by chronological aging. Furthermore, sensitivity analyses accounting for hormone therapy use did not materially alter the results, though the study was not designed to determine causal effects of hormone therapy.
Most of the brain did not change across menopausal stages. The effects were region-specific rather than global, pointing toward targeted remodeling rather than widespread degeneration.
Regardless, any reduction in brain volume sounds concerning. Fortunately, the story did not end there.
When a subset of postmenopausal women (n=17 of 74 in the initial assessment) were reassessed two years later, many of the earlier volume reductions had stabilized—and in several regions, partially reversed. Rather than a steady trajectory of loss, the data suggest a dynamic period of remodeling during the menopausal transition, followed by partial stabilization once hormonal levels settle. What appears to be “loss” at one time point may reflect temporary restructuring in response to endocrine upheaval.
However, structural changes were only part of the picture.
Our research team spends hundreds of hours each month vetting studies and distilling dense literature to deliver evidence-informed insights on health and longevity. If you find value in our work, consider becoming a premium member and supporting our mission.
A shift in energy metabolism
The study also used PET imaging to examine the metabolism of glucose—the brain’s primary fuel source. The brain consumes roughly 20–25% of the body’s glucose-derived energy,2 and reduced glucose metabolism is often observed in neurodegenerative disease.3
Postmenopausal women showed reductions in cerebral glucose metabolism in the assessed brain regions, and—as in the structural analyses—these findings were not significantly altered by hormone therapy use. In isolation, that finding could raise concern; however, this decrease was accompanied by increased cerebral blood flow and preserved, or even increased, production of ATP, the cell’s energy currency.
In other words, despite reduced glucose metabolism, indirect markers of energy availability in these brain regions did not appear to decline.
Instead, the findings suggest the brain may adapt how it generates energy in a low-estrogen environment, though the specific substrates and mechanisms remain uncertain. As glucose utilization becomes less efficient, the brain may compensate by increasing blood flow, improving mitochondrial efficiency, or potentially relying more heavily on alternative fuel sources, such as ketones. While this study cannot determine the exact substrates or mechanisms involved, the key point is that energy production appears to be maintained, despite altered glucose metabolism.
The bottom line
During a time when many women feel like everything is going downhill, these data suggest something more nuanced may be occurring. Rather than passive deterioration, the brain appears to undergo a period of structural and metabolic recalibration in response to profound hormonal change, though whether these changes are uniformly benign remains unknown.
The long-term implications of this transition are still being studied, but these findings provide some reassurance: The menopausal brain appears capable of adaptation, at least over the timeframes studied. What feels like dysfunction may, at least in part, reflect the subjective experience of a large-scale physiological adjustment rather than irreversible decline.
In that sense, the familiar phrase so often used to dismiss women’s experiences takes on an entirely different meaning—one that reassures rather than minimizes. Maybe menopause really is “all in your head”—literally.
For a list of all previous weekly emails, click here.
References
1. Mosconi L, Berti V, Dyke J, et al. Menopause impacts human brain structure, connectivity, energy metabolism, and amyloid-beta deposition. Sci Rep. 2021;11(1):10867. doi:10.1038/s41598-021-90084-y
2. Mink JW, Blumenschine RJ, Adams DB. Ratio of central nervous system to body metabolism in vertebrates: its constancy and functional basis. Am J Physiol. 1981;241(3):R203-R212. doi:10.1152/ajpregu.1981.241.3.R203
3. Cunnane SC, Trushina E, Morland C, et al. Brain energy rescue: an emerging therapeutic concept for neurodegenerative disorders of ageing. Nat Rev Drug Discov. 2020;19(9):609-633. doi:10.1038/s41573-020-0072-x
