Body Composition Through Perimenopause

Many women notice their body changing through their 40s and 50s in ways the bathroom scale doesn’t fully explain. The scale might barely move while the shape and composition of the body shift underneath. DEXA measures what’s actually changing.

What changes, and why. The menopausal transition is associated with meaningful changes in body composition (increased total body fat, a decline in lean body mass, and a redistribution of fat toward the abdomen), driven largely by the fall in estrogen, and occurring somewhat independently of simple aging. In longitudinal data, the rate of fat gain roughly doubles at the onset of the transition while lean mass declines, with the trajectory flattening a couple of years after the final period.

The visceral fat shift. One of the most important changes is where fat goes. Before menopause, a smaller share of body fat is visceral; after menopause, that share rises substantially. One review describes visceral fat rising from roughly 5–8% of total body fat premenopause to around 15–20% postmenopause. This matters because visceral fat is the metabolically active fat linked to cardiometabolic risk, so the redistribution isn’t just cosmetic.

Why a DEXA scan helps here. Because these changes can happen while weight stays relatively stable, they’re easy to miss. A DEXA scan measures fat, lean mass, and visceral fat directly and separately, so you can see the actual changes, establish a baseline, and track them over time rather than guessing. It also measures bone density, which becomes especially relevant after menopause as bone loss accelerates.

Measurement, not treatment. Wayne DEXA measures and reports; we don’t prescribe or manage hormone therapy or any treatment. Your results are yours to review with the clinician who manages your care. This is information to bring to that conversation, not a substitute for it.