A study measuring body composition across the menopause transition: postmenopausal women had less muscle and more belly fat across every weight category - and the shift was most striking in "normal-weight" women.
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The Impact of the Menopausal Transition on Body Composition and Abdominal Fat Redistribution (PDF)
If your body composition changed through perimenopause even when the scale didn't move much, this study documents exactly that - a consistent shift toward less muscle and more belly fat.
Dr. Hammer's 5 Second Takeaways
Menopause shifts fat toward the middle
Across all weight categories, postmenopausal women had higher visceral fat, body-fat percentage, and waist-to-hip ratio - a move toward central (abdominal) fat.
And muscle quietly declines
Postmenopausal women had significantly lower lean body mass, skeletal muscle, total body water, protein, and mineral content than pre- and perimenopausal women.
"Normal weight" doesn't mean protected
The changes were most pronounced in normal-weight women - so a stable scale weight can hide a real shift in body composition and risk.
Visceral fat is the part that matters for risk
Belly (visceral) fat is closely linked to cardiometabolic risk, which is why it's worth tracking beyond just body weight.
Put it into action: prioritize protein and strength training through midlife to defend muscle, and watch your waist measurement, not just the scale.
It's hormones, not willpower
These shifts are driven by the hormonal changes of menopause - more evidence that midlife body changes are biology, not a discipline problem.
Nerd-Out
Szeliga et al. (retrospective cross-sectional study, n=325, bioelectrical impedance) found postmenopausal women had significantly lower lean mass and higher total and visceral fat area, body-fat %, and waist-to-hip ratio across BMI strata. Effects were most marked in normal-weight women (visceral fat area pre/peri/post 36.4 → 48.3 → 55.7 cm²; body fat 24.8% → 27.2% → 28.8%) and attenuated at higher BMI, indicating relative preservation of muscle at higher BMI. The authors emphasize assessing visceral fat in postmenopausal women given its tight link to cardiometabolic risk.
Go to the Source:
This summary is drawn from "The Impact of the Menopausal Transition on Body Composition and Abdominal Fat Redistribution" by Szeliga, Chedraui, and Meczekalski. The full paper is in the linked PDF above.