Your jeans fit differently, but the scale barely moved. You’re working out like you always have, but your midsection seems to have a mind of its own. Maybe you feel a little less strong carrying groceries up the stairs.
If that sounds familiar, you’re not imagining it, and it’s not a lack of willpower.
In our last post, Perimenopause Treatment Options: Hormonal and Non-Hormonal Relief, we walked through the treatments that can ease hot flashes, sleep problems, and mood changes. We also gave strength training a shout-out, because perimenopause is when changes in bone, heart, and metabolic health start to pick up. This post digs into that part of the story: what’s happening under the surface of your body, and what you can do about it.
The Changes You Can’t See on the Scale
Here’s the thing most women don’t hear: the biggest body changes in perimenopause often don’t show up as weight gain at all.
Research from the Study of Women’s Health Across the Nation (SWAN), a large study that followed women for years with DEXA scans, found that about two years before the final period, the rate of fat gain doubles while lean (muscle) mass starts to drop. That pattern continued until about two years after the final period (El Khoudary et al., Circulation, 2020). Because fat goes up while muscle goes down at the same time, your weight can stay about the same even though your body is changing a lot underneath (Lee et al., PLoS One, 2023).
What about weight itself? Women in midlife gain an average of about 2 to 2.3 kg (roughly 4 to 5 pounds) over three years, but research suggests that’s mostly tied to getting older rather than to menopause itself (El Khoudary et al., Circulation, 2020). The shift in where fat goes and how much muscle you keep is the part that’s linked to the menopause transition.
Why the Belly Fat?
Remember the hormone rollercoaster? As estrogen swings and eventually drops, your body tends to store fat differently. Instead of settling on the hips and thighs, more fat moves to the midsection, including visceral fat, the deeper fat that wraps around your organs.
In SWAN, visceral fat rose about 8.2% as women moved through the transition, and a large analysis of more than 14,000 women found waist size grew by about 4 cm (around 1.6 inches) on average (Lambrinoudaki et al., Nature Reviews Endocrinology, 2022).
Why does this matter? Visceral fat isn’t just a “how my clothes fit” issue. It’s closely linked to heart disease and type 2 diabetes risk, which is why experts suggest checking visceral fat in midlife women to catch risk early (Szeliga et al., Journal of Clinical Medicine, 2026). The American Heart Association has even pointed to the menopause transition as a key time to start heart disease prevention (El Khoudary et al., Circulation, 2020).
Muscle: Use It or Lose It (Faster)
Muscle does a lot more than help you lift things. It supports your metabolism, balance, blood sugar control, and independence as you age. Studies show muscle mass drops steadily from premenopause through postmenopause, and that this drop is linked to menopause, not just to age (Lee et al., PLoS One, 2023).
The good news: women who stay more physically active hold on to more muscle, especially in late perimenopause and after (Sipilä et al., Journal of Cachexia, Sarcopenia and Muscle, 2020). Women still build muscle with strength training after menopause, though their bodies may respond a bit more slowly, so consistency and challenging yourself really matter (Menzies et al., Journal of Cachexia, Sarcopenia and Muscle, 2026).
Bone: The Silent Change
Bone loss doesn’t hurt, and you can’t feel it happening. That’s what makes it easy to miss.
Estrogen helps protect your bones. As it drops, bone breaks down faster than your body can rebuild it. SWAN found that bone loss speeds up starting about a year before your final period and is fastest until about two years after. Over 10 years, women lost about 10.6% of the bone density in their spine, and most of that loss (7.4%) happened in that short window around the final period (Greendale et al., Journal of Bone and Mineral Research, 2012).
That’s why perimenopause is such an important time to pay attention. The choices you make now can affect your risk of osteoporosis and fractures for decades. About 35% of White women have osteoporosis after menopause, and the lifetime risk of fracture is about 40% (Lobo and Gompel, Lancet Diabetes & Endocrinology, 2022).
What You Can Do About It
You can’t stop your hormones from changing, but you have more control than you might think.
- Lift weights (or use resistance bands). Strength training is one of the best ways to protect muscle. In postmenopausal women, resistance training, often paired with impact moves like jumping or hopping, can improve bone density in the spine and hip (Woods et al., Journal of Clinical Endocrinology and Metabolism, 2026). Moderate to higher intensity seems to work better than very light exercise.
- Add some impact if you can. Walking is great for your heart, but on its own it does less for your bones than you’d expect. Combining strength work with impact moves gives your bones a stronger signal to rebuild.
- Prioritize protein, calcium, and vitamin D. These help support muscle and bone health. Check with your provider before starting supplements.
- Keep your treatment conversation going. If you’re considering hormone therapy, ask how it may fit into your bone health plan. Hormone therapy has been shown to lower hip fracture risk (Manson et al., JAMA, 2024).
- Know your numbers. You can’t improve what you can’t see.
A quick honest note: research on exercise specifically during perimenopause is still limited, and studies don’t yet agree on the single best program (Whitman et al., Bone, 2025). But the overall message is clear: staying active and building strength is one of the best things you can do for your future self.
Why the Scale Isn’t Enough
This is where a lot of women get frustrated. They step on the scale, see the same number, and assume nothing has changed. Or they rely on a smart scale at home, and the body fat and muscle numbers jump around from day to day.
The truth is, a regular scale can’t tell you whether you’ve lost muscle, gained visceral fat, or lost bone. And home smart scales aren’t reliable for tracking body fat and muscle.
That’s why so many of the studies above used DEXA scans. A DEXA scan measures your fat, muscle, and bone separately, including visceral fat. It gives you a clear starting point, so you can see what’s really changing and whether your workout and nutrition plan is working.
When to Talk to Your Provider
Book an appointment if:
- Your waist size is growing even though your weight hasn’t changed much
- You’ve noticed you’re losing strength or have trouble with balance
- You’ve broken a bone from a minor fall
- You have a family history of osteoporosis, or you smoke, drink heavily, or have taken steroid medications long term
- You’re unsure where to start with exercise or want a plan built around your body
Your Body Is Changing, and You Can Change With It
Perimenopause can shift your body in ways the mirror and scale can’t fully explain. But these changes aren’t a life sentence. With the right information and a plan that fits you, you can protect your muscle, your bones, and your heart for the years ahead.
Ready to See What’s Really Going On?
At Maze Women’s Health, we help women understand what’s happening in their bodies at every stage of hormonal change. Paired with body composition testing at Maze Medical Fitness Testing, you can get a clear picture of your fat, muscle, visceral fat, and bone, not just a number on the scale.
If you’re ready to stop guessing and start understanding your true numbers, schedule an appointment with Maze Women’s Health today. Let’s figure it out together.
Stay tuned for the next blog in our perimenopause series!
