Menopause Triggers Abrupt Changes Across the Body, Large Study Finds

Menopause has long been viewed as a gradual reproductive transition marked mainly by the end of menstrual periods. A large new study suggests the shift is far more sudden and far-reaching. The researchers found changes in blood fats, liver and kidney function, bone health and blood chemistry around a woman’s final menstrual period.

The study, published in Nature Medicine, was led by researchers at the Weizmann Institute of Science in Israel. Experts at Hackensack Meridian Health say the findings support treating menopause as a whole-body health event, not just a set of symptoms to manage.

More Than 300 Million Lab Tests Reveal a Sudden Shift

Researchers analyzed more than 300 million laboratory tests from more than 1 million women. The data came from two large medical data sets, one in the United States and one in Israel, collected between 1999 and 2024. The team used mathematical modeling to estimate when each woman reached menopause. That let them separate menopause-related changes from ordinary aging.

In the U.S. data set, 52 of 90 lab tests showed statistically significant, abrupt changes around menopause. Some of the most pronounced shifts involved bone metabolism, liver tests and blood fats such as cholesterol. Kidney function and blood chemistry also changed. Men of similar ages didn’t show the same pattern. The researchers said that supports a link to menopause rather than aging alone.

The study also found that hormone changes begin well before the final period. Anti-Müllerian hormone, a marker of egg supply, began declining faster about 15 years before menopause. Estradiol began declining faster about 12 years before.

Cholesterol and Blood Fats Can Rise Quickly

Jennifer Cheng, D.O., chief of endocrinology at Hackensack Meridian Jersey Shore University Medical Center, said the findings match what she sees in patients.

“Menopause is a major metabolic pivot point. The sudden decrease in sex hormones fundamentally rewires a woman’s blood chemistry, frequently causing an abrupt spike in cholesterol and shifts in blood fats,” Cheng said.

She explained that falling estrogen raises LDL and VLDL levels in the blood, and higher VLDL can raise triglycerides.

“This study validates what we see clinically: The cardiovascular and metabolic rulebook completely changes for women post-menopause, requiring proactive screening and lifestyle adjustments,” she said. She added that addressing these metabolic risks can help lower the risk of heart attack, stroke and other complications.

Looking Beyond Hot Flashes

Soma Mandal, M.D., internist and medical director of women’s health at Hackensack Meridian Jersey Shore University Medical Center, said the research should broaden how clinicians approach menopause care.

“For decades, the conversation around menopause has been heavily focused on managing immediate symptoms like hot flashes and fatigue, but [these data show] we need to be looking far deeper into vital organ function as well,” Mandal said. “Menopause causes systemic inflammation and metabolic changes that can tax these organs once a woman has her final menstrual period.”

She noted that metabolic changes speed up at menopause itself, while perimenopause, the transition leading up to it, typically lasts four to eight years.

“With that, we need to view the onset of menopause as a critical intervention window for whole-body preventive care,” she said.

A Window to Protect Long-Term Health

Kanchi Chadha, M.D., FACOG, OB-GYN and director of the Midlife Women’s Health and Longevity Program at Hackensack Meridian Hackensack University Medical Center, said understanding these shifts is key to helping women live longer, healthier lives.

“Aging is not always a linear process. This study shows there are rapid, systemic changes driven by declining sex hormone levels,” Chadha said. “By anticipating how these hormonal shifts impact our cardiovascular, metabolic and musculoskeletal system, we can better design evidence-based strategies to keep women thriving for decades post-menopause.”

Hormone Therapy and Other Open Questions

Results for 39 lab measures differed between women who used menopausal hormone therapy (MHT) and those who didn’t. The researchers said this suggests MHT may moderate some changes. However, the study was observational. It doesn’t show that every lab change leads to illness, or that hormone therapy is right for every woman. Some outside researchers have also cautioned that the authors’ description of a “physiological cliff” could alarm women, since the study doesn’t show a dramatic physical or mental decline.

More research is needed to learn whether earlier monitoring or treatment improves health outcomes. In the meantime, women approaching menopause can ask their clinician about screening for cholesterol, bone health and other metabolic changes, and about whether MHT makes sense for them.