Why Am I Gaining Weight Around My Middle? Perimenopause, Belly Fat, and Body Composition
Written by Dr Shauna Watts, GP with special interest in perimenopause and menopause care.
It's Not Willpower. It's Hormones.
You haven’t changed what you eat. You’re doing the same exercise you’ve always done. But suddenly there’s weight around your middle that wasn’t there before, and nothing seems to shift it.
This is one of the most frustrating experiences I hear about from women in perimenopause – and one of the most misunderstood. It’s not about willpower or laziness. It’s hormonal. And it’s real.
Why Does Fat Redistribute During Perimenopause?
Before menopause, oestrogen plays a key role in directing where your body stores fat – favouring the hips, thighs, and buttocks (the classic pear shape). As oestrogen declines in perimenopause, this distribution pattern shifts. Fat begins to accumulate preferentially around the abdomen – what’s often called visceral fat.
This is more than a cosmetic concern. Visceral fat – fat stored around the organs in the abdominal cavity – is metabolically active and is associated with increased risk of cardiovascular disease, insulin resistance, and type 2 diabetes.
Is It Just Fat, or Has My Body Composition Changed?
Both. Many women in perimenopause lose lean muscle mass (a process called sarcopenia) at the same time as gaining fat. This means your weight on the scales might not change much, but your body composition shifts significantly. You have more fat and less muscle – and muscle is what drives your metabolic rate.
This is why so many women feel like their metabolism has ‘slowed down.’ In a sense, it has – because the muscle that was burning calories has decreased.
"The number on the scales is almost never the full picture during perimenopause. What matters more is what's happening to your body composition - and there's a lot you can do about that."
- Dr Shauna Watts -
What Actually Works?
Resistance training
This is the single most important lifestyle intervention for perimenopausal body composition. Building and maintaining muscle mass counteracts the metabolic shift directly. Two to three sessions per week of weight-bearing exercise – not just walking or yoga – makes a significant difference. I know it feels counterintuitive if cardio has always been your thing, but the evidence is clear.
Protein intake
Most women don’t eat enough protein – particularly as they get older. Adequate protein (at least 1.2 to 1.6g per kilogram of body weight per day) supports muscle preservation and can help manage appetite. Focus on protein at every meal.
Menopausal Hormone Therapy (MHT)
MHT doesn’t cause weight gain – this is a persistent myth. In fact, restoring oestrogen can support a more favourable fat distribution and help preserve muscle mass. Many women find their body composition improves with MHT alongside appropriate exercise.
Sleep
Poor sleep drives cortisol, which drives fat storage – particularly abdominal fat. Treating sleep disruption is not a peripheral issue when it comes to weight management in perimenopause. It’s central.
Manage blood sugar
Oestrogen helps regulate insulin sensitivity. As it declines, blood sugar regulation can become less efficient. Eating in ways that support stable blood sugar – adequate protein, fibre, reduced refined carbohydrates – is more important in perimenopause than at any earlier stage of life.
What Actually Works?
Eating less and exercising more – the standard advice – is often counterproductive in perimenopause if it means cutting calories significantly and doing more cardio. This approach can accelerate muscle loss and drive cortisol up, making the problem worse. I see this pattern repeatedly.
Frequently Asked Questions
Is perimenopausal weight gain inevitable?
Body composition changes are very common, but significant weight gain is not inevitable. With the right approach – particularly resistance training and adequate protein – many women maintain or improve their body composition through perimenopause.
Will MHT help me lose weight?
MHT isn’t a weight loss treatment, but it can support a more favourable body composition and reduce the visceral fat accumulation driven by oestrogen decline. It works best alongside lifestyle strategies.
Why is the weight only around my middle?
This is the classic pattern of oestrogen-driven fat redistribution. Your body’s instructions for where to store fat have changed because of hormonal shifts – not because of anything you’re doing wrong.
Is visceral fat dangerous?
Yes, more so than subcutaneous fat (fat under the skin). Visceral fat is linked to increased cardiovascular and metabolic risk. This is another reason why addressing perimenopausal body composition changes actively – rather than just accepting them – matters for your long-term health.