The trousers fit differently even when the scale has not moved

Trunk fat

5 min read

The trousers still close. But the place where they sit has shifted by a centimetre or two, and the fabric pulls differently across the lower belly. You checked the label to be sure they had not shrunk.

You are not imagining what you see. What changed is not how much fat your body carries but where it put it. The scale does not show this. Your trousers do.

A longitudinal study of 1,246 women used DXA scans across the menopausal transition. Before it, fat mass was increasing at about 1.0 percent per year. At the start of the transition, that rate roughly doubled to 1.7 percent. Lean mass reversed from slowly increasing to declining. Body weight and BMI did not significantly change. The scale showed the same steady climb it always had.

CT imaging of 362 women in the same cohort found that visceral fat held steady until about two years before the final menstrual period, then accelerated steeply. The International Menopause Society’s 2025 recommendations describe estrogen decline as the major cause of increased abdominal adiposity, noting that this occurs even in women with a normal BMI.

What it does not establish

No study can say what fraction of the change in your midsection is driven by estrogen, what fraction by aging, and what fraction by sleep or activity changes. The population data show a clear acceleration during the transition, but how those forces combine in any individual is not something the research can specify.

The redistribution pathway

Before the transition, estrogen promotes fat storage in the hips and thighs. As it declines, deposition shifts toward the abdomen and the visceral compartment, deep around the organs. The visceral shift changes metabolic risk. Aging, activity, and sleep all play a role alongside estrogen.

The numbers

1.0% → 1.7%

Annual fat mass gain before vs. during the menopausal transition. Lean mass reversed from +0.2% to –0.2% per year. Weight and BMI did not significantly change. (Greendale et al., 2019; 1,246 women)

~4 years

The window of accelerated change: about two years before the final menstrual period to two years after. Both trajectories then level off. (Greendale et al. and Samargandy et al., SWAN)

The transition concentrates change in a window. Within it, fat gain nearly doubles and lean mass reverses. After it, both level off. The body is adjusting to new conditions, not in perpetual decline.

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The intervention with the strongest evidence

Resistance training combined with aerobic exercise

Systematic review and meta-analysis

A 2023 review pooled 101 randomised trials involving 5,697 postmenopausal women. Exercise significantly decreased fat mass, waist circumference, and visceral fat. Combined training had the strongest effects on both fat and muscle outcomes. It does not reverse the hormonal shift. What it does is reduce visceral fat and preserve lean mass during a period when both are changing.

“Adults should also do muscle-strengthening activities at moderate or greater intensity that involve all major muscle groups on 2 or more days a week, as these provide additional health benefits.”

WHO Physical Activity Guidelines, 2020

What it is not

Exercise does not restore premenopausal estrogen or return fat to a previous distribution. Its outcomes are separate from the hormonal question.

When to call

Persistent abdominal bloating more than 12 times a month, especially over 50. NICE guidelines list this alongside pelvic pain and loss of appetite as symptoms warranting investigation for ovarian cancer.

A waist circumference at or above 88 cm (35 inches) is the AHA/NHLBI threshold for one criterion of metabolic syndrome in women. If yours has crossed that line, bring the number to your next visit.

This week

Measure your waist with a cloth tape at the navel, just after you breathe out. Write the number down. This is a baseline, not a target. It lets you see what changes and when.

Pick two days this week and load your muscles. Squats to a chair and wall push-ups on one day, standing rows with any weight you have on the other. The WHO guideline recommends at least two resistance sessions per week involving all major muscle groups.

On the days between, walk. The same guideline recommends 150 to 300 minutes of moderate aerobic activity per week. A brisk walk counts. The meta-analysis found that combining aerobic and resistance training improved body composition outcomes in postmenopausal women.

The redistribution is real and measurable on a scan. It is not something you caused. But tissue that receives a load twice a week behaves differently from tissue that does not, and that shows up in the data. Two days. Whatever you have in the house.

One tap, no form

What changed first for you?

Tapping opens a prepared reply. Nothing is shared. What readers tap most decides what comes next.

My trousers fit differently but the scale barely moved

I lost strength I used to have

I want to know more about what resistance training does

None of these, but something changed

Or write in your own words. Every reply is read.

Read recent issues

Every source read for this issue

One longitudinal cohort, one CT-imaging cohort, one professional body recommendation, one meta-analysis, and one clinical guideline.

1	Body composition and weight during the menopause transition Greendale et al., JCI Insight, SWAN cohort, 2019

2	Visceral adipose tissue over the menopause transition Samargandy et al., Menopause, CT cohort, 2021

3	IMS recommendations on midlife health and menopause IMS, Climacteric, 2025

4	Exercise and body composition in postmenopausal women Khalafi et al., Front Endocrinol, meta-analysis, 2023

5	Physical activity and sedentary behaviour guidelines WHO, 2020

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