Menopause brings abrupt changes in bone, liver and blood fats, huge study finds
Menopause is usually described as a slow fade. A study of more than a million women suggests something different: a sharp step change across the body at the final period, with hormone shifts starting more than a decade before.
- Study type
- Retrospective analysis of routine lab records (observational)
- Who
- More than 1 million women in the United States and Israel, 1999–2024
- Published
- Nature Medicine, online October 12, 2026
- Bottom line
- Strong evidence about timing; no evidence yet about which interventions change the curve
What the menopause study found
The team, whose lead author is at the Weizmann Institute of Science in Israel, pooled more than 300 million laboratory tests collected during ordinary medical care. Because the final menstrual period is rarely recorded, past studies have struggled to pin down exactly when changes happen. Working with a dataset this large let them line up women by the timing of their last period and look for patterns.
- An abrupt shift at the final period. In the US data, 52 of the 90 lab tests studied showed a statistically significant, sudden change around menopause.
- Which systems: the biggest shifts were in bone metabolism, liver tests and how the body handles blood fats. Kidney function and blood chemistry shifted too.
- Not just aging: men of the same ages didn’t show these abrupt changes, so the authors tie them to menopause itself rather than getting older.
Hormones start changing more than a decade earlier
For women in their late 30s and 40s, this is the part worth noticing. The hormone shifts that lead up to menopause began long before the last period:
| Hormone | What happened | When |
|---|---|---|
| Anti-Müllerian hormone (AMH) | Declined rapidly | About 15 years before the final period |
| Follicle-stimulating hormone (FSH) | Began rising more rapidly | About 14 years before |
| Estradiol | Declined rapidly | About 12 years before |
In other words, the menopause transition is a story that often starts in your late 30s, even if nothing feels different yet.
What about hormone therapy?
According to the journal’s press release, hormone therapy was associated with smaller changes in many measures, particularly bone, liver and kidney markers. The authors themselves say this needs to be confirmed in future studies. Because women weren’t randomly assigned to hormone therapy here, the difference could reflect who chooses it, not just what it does.
What the study can’t tell you
- It’s observational. It shows when lab values change, not what causes the change or what prevents it.
- Menopause status was self-reported, and the data were collected for routine care, not research.
- “Cliff” describes lab curves, not how women feel. Experts not involved in the study cautioned that the framing could sound more alarming than the findings, which don’t show a dramatic physical or mental decline.
What this means for you
Nothing here calls for a new supplement or test. What it does support is paying attention before menopause, not after:
- Ask your clinician how they’d monitor bone health and cholesterol as you move through your 40s, and what your personal risk factors are.
- Keep building muscle and bone with strength training, which has the strongest evidence of any habit for both.
- If you’re weighing hormone therapy, that’s a conversation about your own risks and benefits with your doctor, not a decision to make from one observational study.
Related: our evidence check on creatine for women over 40.
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Sources
- Pridham G, Hayut Y, Lavi-Shoseyov N, et al. Population-scale reconstruction of menopause dynamics reveals a physiological cliff at the final menstrual period. Nature Medicine, 2026. doi:10.1038/s41591-026-04614-0
- Nature Portfolio press release on the study, October 13, 2026
- ScienceAlert: coverage including comments from independent experts, October 13, 2026
Wellness education, not medical advice. This article summarizes published research and official sources; it isn’t a recommendation for your situation. Talk to your clinician before starting a supplement, device or protocol, especially if you’re pregnant, nursing, take medication or manage a health condition.