The Bill Comes Due in Midlife: Allostatic Load in the Woman Who Takes Care of Everyone Else
Written and edited by Sarah Bonza, MD, MPH, FAAFP, MSCP, DipABLM, NBC-HWC | Bonza Health
Allostatic load is the cumulative physiological cost of chronic stress — the "wear and tear" that accumulates in the body from repeatedly mounting a stress response and never fully shutting it off.
Key Takeaways
Allostatic load is the cumulative biological cost of chronic stress — the measurable wear on a body that has never been allowed to stand down.
For decades, estrogen and progesterone acted as shock absorbers, buffering the physiologic cost of that load in women.
In perimenopause, the buffer becomes erratic and then leaves. The load doesn't change. The capacity to absorb it does.
Most midlife women interpret this as personal failure. It is not a character problem. It is a physiology problem.
"Just reduce your stress" is not a treatment plan. Regulating the nervous system is, and it belongs in preventive care alongside the DXA scan and the lipid panel.
She is forty-seven. She has held this family together through a job change, a parent's diagnosis, a teenager's hard year, and a marriage that required more of her than she has ever said out loud. She has been, by every available measure, extraordinarily competent.
And now she cannot answer a simple email without her chest tightening.
She tells me she thinks something is wrong with her. She uses the word weak. She wants to know why she can no longer do the thing she has always done, which is absorb whatever arrives and keep moving.
I want to tell you what I tell her.
What is allostatic load?
Allostatic load is the cumulative physiological cost of chronic stress — the "wear and tear" that accumulates in the body from repeatedly mounting a stress response and never fully shutting it off. The term was introduced by Bruce McEwen and Eliot Stellar in 1993 to describe something clinicians kept observing but had no name for: the way a life of sustained demand shows up in the tissue [1,2].
This is not a metaphor. Allostatic load is measured. The MacArthur Studies of Successful Aging built a composite index from ten biomarkers — cortisol, catecholamines, DHEA-S, blood pressure, waist-hip ratio, HDL and total cholesterol, glycosylated hemoglobin — and found that a higher score predicted seven-year mortality, cognitive decline, and physical decline, independent of baseline health and demographics [3,4].
So when I say the body keeps a ledger, I mean it literally. There is a number.
TABLE 1 — The Buffer Ledger: What You Lose in Perimenopause
Who carries the load, and why is it so often a woman?
Women are disproportionately positioned in the roles that generate sustained, low-grade, unrelenting demand. The 2025 Caregiving in the U.S. report from AARP and the National Alliance for Caregiving found that 63 million Americans — nearly one in four adults — provided care in the past year, and that nearly one in three caregivers is simultaneously raising a child under 18 [5]. Women are more likely to be caregivers, to give more hours, to receive less help, and to be managing multiple competing obligations at once [6].
But the exposure is only half of it. There is also the style of coping.
Many of us were raised to be agreeable, competent, and useful. Over-giving stopped being a behavior and became an identity — the thing that makes us legible and valuable. The clinical name for one version of this is self-silencing: suppressing your own needs and reactions to preserve a relationship. In the Framingham Offspring Study, women who self-silenced during conflict with a spouse had roughly four times the risk of dying over ten years compared with women who did not [7]. In a study of midlife women, greater self-silencing was associated with carotid plaque, independent of standard cardiovascular risk factors, depression, and health behaviors [8].
Being the one who handles it is not free. We have the imaging to prove it.
TABLE 2 — Seven Signs You're Carrying an Allostatic Load
What was the hormonal buffer — and what did it actually do?
Here is the part that almost no one explains to women, and it is the part that changes everything.
For roughly thirty years, your ovarian hormones were absorbing the physiologic cost of the load you were carrying.
Progesterone is metabolized to allopregnanolone, a neurosteroid that acts as a positive allosteric modulator at the GABA-A receptor — the brain's primary inhibitory system, and the same receptor family targeted by benzodiazepines. Animal and human work has shown that progesterone's anxiolytic effect tracks with rising cortical allopregnanolone and enhanced GABA-A receptor function [9,10]. Every luteal phase, for three decades, you were producing your own endogenous calming agent.
Estradiol does different work. It shapes serotonergic signaling and modulates the reactivity of the hypothalamic–pituitary–adrenal (HPA) axis — the stress axis itself [11]. It influenced how hard your system fired and how fast it recovered.
Together, they were shock absorbers. You were driving the same rough road everyone else was. You just had suspension.
Composite index from the MacArthur Studies of Successful Aging. Higher scores predicted 7-year mortality, cognitive decline, and physical decline [3,4].
What happens in perimenopause when the buffer leaves?
Perimenopause is not a gentle decline in hormones. It is a period of erratic, unpredictable fluctuation before the eventual drop — which is why the STRAW+10 criteria stage it by cycle variability rather than by a single hormone value [12]. The buffer does not fade smoothly. It flickers, surges, and fails.
Meanwhile, the load itself does not decrease. In midlife it typically increases: aging parents, adolescent or launching children, career peak, financial pressure, and, frequently, a marriage under strain.
And the stress axis itself is shifting. Longitudinal data from the Seattle Midlife Women's Health Study documented rising cortisol across the menopausal transition, closely tracking reproductive hormone markers rather than social stress variables — meaning the change is being driven biologically, from inside [13,14].
So the equation is brutally simple:
Same load. No shock absorbers. A stress axis that is itself dysregulating.
This is why women describe perimenopause as a personality change. The rage that arrives out of proportion. The 3 a.m. wakefulness. The inability to tolerate noise, or a fourth request, or one more person needing something. It is not that she has become fragile. It is that the analgesia wore off, and she is finally feeling what she has been carrying the whole time.
The mood data supports this. Across the SWAN cohort, women were significantly more likely to report clinically relevant depressive symptoms during perimenopause than during premenopause [15,16]. And in a SWAN analysis of over 2,000 perimenopausal women, allostatic load was directly examined in this population — this is not a fringe framework, it is being applied to exactly the women I see [17].
Conceptual illustration. The load was always there. The buffer wasn't always leaving.
Why "just reduce your stress" is useless advice
Because it is not a plan. It is a wish, delivered to a woman whose entire structure is built on being the one who does not get to reduce anything.
Telling a woman who is the load-bearing wall of three households to "reduce stress" asks her to solve the problem using the exact identity that created it — she will simply add "successfully de-stressing" to the list of things she must perform competently, and fail at it, and add that to the ledger.
It also misdiagnoses the target. The problem is not that she has too many appointments. The problem is that her nervous system has lost the ability to complete a stress cycle and return to baseline. You cannot calendar your way out of an HPA axis that no longer shuts off.
In midlife, allostatic load typically increases with aging parents, adolescent or launching children, career peak, financial pressure, and, frequently, a marriage under strain.
Where does somatic work come in?
Stress is not only a thought. It is a physiologic state held in the autonomic nervous system, and it can be addressed at that level. Talk therapy addresses the story. Somatic approaches address the physiology that is still holding it.
The evidence base is younger than I would like, and I will say that plainly. But it exists and it is growing:
A randomized controlled trial of Somatic Experiencing in PTSD found significant symptom improvement versus waitlist control [18]. A second RCT found that brief Somatic Experiencing added to usual care significantly reduced PTSD symptoms and fear of movement in patients with chronic low back pain [19]. A 2021 scoping review concluded the findings are promising and preliminary [20] — which is an honest description, not a disqualification.
Trauma-sensitive yoga, in a randomized controlled trial of 64 women with chronic, treatment-resistant PTSD, significantly reduced symptoms compared with a supportive women's health group [21].
Mindfulness-Based Stress Reduction in perimenopausal women, in an RCT, produced fewer depressive symptoms, less perceived stress, less anxiety, greater resilience, and better sleep — with the largest benefit in women who had more recent stressful life events and greater sensitivity to estradiol fluctuation [22]. In other words: it worked best in exactly the woman I am describing. A separate RCT found MBSR outperformed active menopause education on the anxiety and depression subscales [23].
Breathwork, deliberate downregulation, interoceptive awareness, bodywork, trauma-informed movement — these are not a substitute for evaluating and treating a woman's hormones, her thyroid, her iron, her sleep apnea, or her depression. I do all of that. But they address something those tools do not touch, which is the learned physiologic setpoint of a body that has been on watch for thirty years.
Stress is not only a thought. It is a physiologic state held in the autonomic nervous system, and it can be addressed at that level. T
I know this is not standard midlife advice
I'm saying it anyway, because I watch it change outcomes.
The standard midlife visit is fifteen minutes, a lipid panel, and a conversation about hormone therapy. All of that matters, and I offer it. But if I send a woman home with a prescription and no acknowledgment that her nervous system has been running a deficit since she was twenty-four, I have treated the deficiency and ignored the debt.
Start with something low-barrier and repeatable: paced breathing with a longer exhale, trauma-informed yoga, or a body-based therapy with a trained practitioner.
The reframe: this is preventive medicine, not self-indulgence
We do not consider a DXA scan a luxury. We screen bone density in midlife women because we understand that decades of quiet accumulation produce a fracture, and we would rather intervene before the fracture.
Allostatic load is the same logic applied to the stress system. It predicts mortality, cognitive decline, and functional decline [3,4]. It is cumulative. It is modifiable. And in midlife, for the first time in decades, it is fully visible — because the hormones that were hiding it are gone.
So when a woman tells me she is going to start protecting an hour a week for her nervous system, I do not hear indulgence. I hear the same preventive reasoning that put her on a bone scan and a statin.
You were never meant to be the shock absorber for everyone else's life. And the fact that you could be one for thirty years is not evidence that you should have been.
Frequently Asked Questions
What is allostatic load in simple terms?
Allostatic load is the accumulated physical cost of chronic stress. Each time your body activates a stress response and does not fully recover, a small amount of wear is deposited across your cardiovascular, metabolic, immune, and neuroendocrine systems. Over decades, that accumulation is measurable and predicts real health outcomes.
Why does perimenopause make stress feel unmanageable?
Estrogen and progesterone buffer the stress response — progesterone through its metabolite allopregnanolone at the GABA-A receptor, estradiol through effects on serotonin signaling and HPA axis reactivity. In perimenopause these hormones fluctuate erratically and then decline, removing that buffer while the underlying stress load remains unchanged or increases.
Is allostatic load the same as burnout?
No. Burnout is an occupational syndrome defined by exhaustion, cynicism, and reduced efficacy. Allostatic load is a physiologic measure of cumulative biological dysregulation. A woman can carry a high allostatic load without meeting criteria for burnout, and burnout can occur without the biomarker profile.
Can allostatic load be reversed?
It can be reduced. Allostatic load is composed of modifiable biomarkers — blood pressure, waist-hip ratio, lipids, glycemic markers, and stress hormones. Research in older adults has associated reductions in allostatic load with lower all-cause mortality risk. Nervous system regulation, sleep, movement, and appropriate medical treatment all act on these components.
Should I get my cortisol tested?
A single cortisol value rarely answers the question. Cortisol is highly variable by time of day and situation, and a "normal" result does not rule out allostatic load, which is a multi-system composite. I evaluate cortisol in clinical context, alongside thyroid function, metabolic markers, sleep, and symptom pattern — not as a standalone test.
What kind of somatic work should I start with?
Start with something low-barrier and repeatable: paced breathing with a longer exhale, trauma-informed yoga, or a body-based therapy with a trained practitioner. The specific modality matters less than consistency and the presence of a practitioner who can keep you regulated rather than flooded. If you have significant trauma history, work with someone trained in trauma-informed care.
Sarah Bonza, MD, is the founder of Bonza Health, where she cares for women navigating perimenopause and midlife. This article is for education and does not constitute individual medical advice. If you are struggling with your mood, your sleep, or your capacity to function, please speak with a clinician who will take it seriously.
At Bonza Health, we approach midlife health and hormonal transitions as one connected system — because your body treats them that way. Schedule a consultation.
References
[1] B. S. McEwen and E. Stellar, "Stress and the individual: Mechanisms leading to disease," Arch. Intern. Med., vol. 153, no. 18, pp. 2093–2101, Sep. 1993. PMID: 8379800. https://pubmed.ncbi.nlm.nih.gov/8379800/
[2] B. S. McEwen, "Stress, adaptation, and disease: Allostasis and allostatic load," Ann. N. Y. Acad. Sci., vol. 840, pp. 33–44, May 1998. PMID: 9629234. https://doi.org/10.1111/j.1749-6632.1998.tb09546.x
[3] T. E. Seeman, B. H. Singer, J. W. Rowe, R. I. Horwitz, and B. S. McEwen, "Price of adaptation—Allostatic load and its health consequences: MacArthur studies of successful aging," Arch. Intern. Med., vol. 157, no. 19, pp. 2259–2268, Oct. 1997. PMID: 9343003. https://doi.org/10.1001/archinte.157.19.2259
[4] T. E. Seeman, B. S. McEwen, J. W. Rowe, and B. H. Singer, "Allostatic load as a marker of cumulative biological risk: MacArthur studies of successful aging," Proc. Natl. Acad. Sci. U.S.A., vol. 98, no. 8, pp. 4770–4775, Apr. 2001. PMID: 11287659. https://doi.org/10.1073/pnas.081072698
[5] AARP and National Alliance for Caregiving, Caregiving in the U.S. 2025. Washington, DC, USA: AARP, Jul. 2025. https://doi.org/10.26419/ppi.00373.001
[6] P. Kerr, S. Kheloui, M. Rossi, M. Désilets, and R.-P. Juster, "Allostatic load and women's brain health: A systematic review," Front. Neuroendocrinol., vol. 59, art. no. 100858, Oct. 2020. PMID: 32758482. https://doi.org/10.1016/j.yfrne.2020.100858
[7] E. D. Eaker, L. M. Sullivan, M. Kelly-Hayes, R. B. D'Agostino, Sr., and E. J. Benjamin, "Marital status, marital strain, and risk of coronary heart disease or total mortality: The Framingham Offspring Study," Psychosom. Med., vol. 69, no. 6, pp. 509–513, Jul.–Aug. 2007. PMID: 17634565. https://doi.org/10.1097/psy.0b013e3180f62357
[8] K. Jakubowski et al., "The cardiovascular cost of silence: Relationships between self-silencing and carotid atherosclerosis in midlife women," Ann. Behav. Med., vol. 56, no. 3, pp. 282–290, Mar. 2022. PMID: 34124743. https://doi.org/10.1093/abm/kaab046
[9] D. Bitran, R. H. Purdy, and C. K. Kellogg, "Anxiolytic effect of progesterone is associated with increases in cortical allopregnanolone and GABA-A receptor function," Pharmacol. Biochem. Behav., vol. 45, no. 2, pp. 423–428, Jun. 1993. PMID: 8392205. https://doi.org/10.1016/0091-3057(93)90260-z
[10] T. Bäckström et al., "Allopregnanolone and mood disorders," Prog. Neurobiol., vol. 113, pp. 88–94, Feb. 2014. PMID: 23978486. https://doi.org/10.1016/j.pneurobio.2013.07.005
[11] M. A. Stephens, P. B. Mahon, M. E. McCaul, and G. S. Wand, "Hypothalamic-pituitary-adrenal axis response to acute psychosocial stress: Effects of biological sex and circulating sex hormones," Psychoneuroendocrinology, vol. 66, pp. 47–55, Apr. 2016. PMID: 26773400. https://doi.org/10.1016/j.psyneuen.2015.12.021
[12] S. D. Harlow et al., "Executive summary of the Stages of Reproductive Aging Workshop +10: Addressing the unfinished agenda of staging reproductive aging," J. Clin. Endocrinol. Metab., vol. 97, no. 4, pp. 1159–1168, Apr. 2012. PMID: 22344196. https://doi.org/10.1210/jc.2011-3362
[13] N. F. Woods, E. S. Mitchell, and K. Smith-DiJulio, "Cortisol levels during the menopausal transition and early postmenopause: Observations from the Seattle Midlife Women's Health Study," Menopause, vol. 16, no. 4, pp. 708–718, Jul.–Aug. 2009. PMID: 19277016. https://doi.org/10.1097/gme.0b013e318198d6b2
[14] N. F. Woods, M. C. Carr, E. Y. Tao, H. J. Taylor, and E. S. Mitchell, "Increased urinary cortisol levels during the menopause transition," Menopause, vol. 13, no. 2, pp. 212–221, Mar.–Apr. 2006. PMID: 16645535. https://doi.org/10.1097/01.gme.0000198490.57242.2e
[15] J. T. Bromberger et al., "Depressive symptoms during the menopausal transition: The Study of Women's Health Across the Nation (SWAN)," J. Affect. Disord., vol. 103, nos. 1–3, pp. 267–272, Nov. 2007. PMID: 17331589. https://doi.org/10.1016/j.jad.2007.01.034
[16] J. T. Bromberger and H. M. Kravitz, "Mood and menopause: Findings from the Study of Women's Health Across the Nation (SWAN) over 10 years," Obstet. Gynecol. Clin. North Am., vol. 38, no. 3, pp. 609–625, Sep. 2011. PMID: 21961723. https://doi.org/10.1016/j.ogc.2011.05.011
[17] P. Alebna and N. Maleki, "Allostatic load in perimenopausal women with migraine," Front. Neurol., vol. 12, art. no. 649423, Apr. 2021. https://doi.org/10.3389/fneur.2021.649423
[18] D. Brom, Y. Stokar, C. Lawi, V. Nuriel-Porat, Y. Ziv, K. Lerner, and G. Ross, "Somatic Experiencing for posttraumatic stress disorder: A randomized controlled outcome study," J. Trauma. Stress, vol. 30, no. 3, pp. 304–312, Jun. 2017. PMID: 28585290. https://doi.org/10.1002/jts.22189
[19] T. E. Andersen, Y. Lahav, H. Ellegaard, and C. Manniche, "A randomized controlled trial of brief Somatic Experiencing for chronic low back pain and comorbid post-traumatic stress disorder symptoms," Eur. J. Psychotraumatol., vol. 8, no. 1, art. no. 1331108, Jun. 2017. PMID: 28680540. https://doi.org/10.1080/20008198.2017.1331108
[20] M. Kuhfuß, T. Maldei, A. Hetmanek, and N. Baumann, "Somatic experiencing—Effectiveness and key factors of a body-oriented trauma therapy: A scoping literature review," Eur. J. Psychotraumatol., vol. 12, no. 1, art. no. 1929023, Jul. 2021. PMID: 34290845. https://doi.org/10.1080/20008198.2021.1929023
[21] B. A. van der Kolk, L. Stone, J. West, A. Rhodes, D. Emerson, M. Suvak, and J. Spinazzola, "Yoga as an adjunctive treatment for posttraumatic stress disorder: A randomized controlled trial," J. Clin. Psychiatry, vol. 75, no. 6, pp. e559–e565, Jun. 2014. PMID: 25004196. https://doi.org/10.4088/jcp.13m08561
[22] J. L. Gordon, M. Halleran, S. Beshai, T. A. Eisenlohr-Moul, J. Frederick, and T. S. Campbell, "Endocrine and psychosocial moderators of mindfulness-based stress reduction for the prevention of perimenopausal depressive symptoms: A randomized controlled trial," Psychoneuroendocrinology, vol. 130, art. no. 105277, Aug. 2021. PMID: 34058560. https://doi.org/10.1016/j.psyneuen.2021.105277
[23] C. Wong et al., "Mindfulness-based stress reduction (MBSR) or psychoeducation for the reduction of menopausal symptoms: A randomized, controlled clinical trial," Sci. Rep., vol. 8, art. no. 6609, Apr. 2018. https://doi.org/10.1038/s41598-018-24945-4
[24] R.-P. Juster, B. S. McEwen, and S. J. Lupien, "Allostatic load biomarkers of chronic stress and impact on health and cognition," Neurosci. Biobehav. Rev., vol. 35, no. 1, pp. 2–16, Sep. 2010. PMID: 19822172. https://doi.org/10.1016/j.neubiorev.2009.10.002
