Get access to Very Peri , Mamamia's exclusive perimenopause series, for just $59. 25 world-leading experts, over 20 on-demand sessions, available now. We've sorted through the noise so you don't have to. Go to veryperi.com.au today. You hot? Same.

When you reach your late 30s and mid-40s, there's a specific kind of panic that sets in. A quiet type of panic that tends to happen in front of a wardrobe mirror or while trying to button a pair of jeans that fit perfectly just six months ago.

The routine hasn't changed. The diet is the same as it has always been. The weekly workouts haven't wavered.

Why then doesn't everything feel and look… different?

It seems that, entirely independent of our daily efforts, the body has decided to do its own thing.

Watch the trailer for Very Peri, Mamamia's on-demand perimenopause series. Post continues below.

If this sounds deeply familiar, you're not alone.

Ahead of Very Peri, Mamamia's on-demand perimenopause series launching, we surveyed over 1,000 women about their experiences with midlife health. The number one, overwhelming concern keeping our community up at night? Weight gain.

And it is backed by a frustrating medical reality: during perimenopause, the average woman gains roughly 1.5 kilograms a year without changing a single thing about her routine.

Coolcoolcool.

For generations, however, the societal response to this shift was predictable: Eat less. Move more. Try harder.

We were told that the maths of our bodies was simple, and if the equation stopped working, it was a moral failing.

You must've become lazy.

You're not eating healthily enough.

Water! Drink more water.

The result? A lost generation of women floating through perimenopause, blinded by the shame of thinking they're the problem. That it's something they're doing wrong.

The fact is, there's a continued stigma that clouds how we think and feel about perimenopause, particularly when it comes to weight gain.

But in 2026, as the medical community undergoes a massive, long-overdue overhaul regarding women's health, a new truth is emerging: the old math didn't fail because women lacked discipline. It failed because the biological rules changed.

So, we want to create a discussion.

To understand how to navigate this shift without falling back into the toxic traps of traditional diet culture, Mamamia spoke to leading experts about what's actually happening beneath the surface and how we need to rewire our approach to health, nutrition, and movement.

Why the body changes in midlife.

As Sydney-based GP and women's health expert Dr Ginni Mansberg told us, the midlife shift isn't a behavioural crisis. In fact, it's far from it.

"Women don't suddenly forget how to eat in their 40s. Their biology changes," she said.

"Falling oestrogen shifts fat to the tummy and may contribute to muscle loss, while poor sleep, stress and comfort eating all stack the odds against them. That's why the strategies that worked at 30 often need a rethink by 50."

Meaning? The shift in where our bodies store fat isn't aesthetic — it's deeply hormonal. And it means traditional calorie-counting completely loses its efficacy.

To break down the exact mechanism behind this shift, Mamamia turned to Dr Georgia Rigas, a specialist medical practitioner in obesity and metabolic health. She explained that this transition is purely structural.

"It is entirely driven by biology, not a lack of willpower," Dr Rigas said. "Before menopause, estrogen directs your body to store fat safely in your hips and thighs. This lower-body fat isn't just benign; it actively secretes protective hormones that help shield a woman's cardiovascular system, which is why pre-menopausal women have a significantly lower risk of heart attack and strokes."

"As estrogen drops, that biological 'storage map' completely changes. Your body stops storing fat in those protective lower-body areas and starts packing visceral fat around your internal organs. Crucially, this organ-wrapping fat acts like an entirely different tissue — it secretes inflammatory hormonal chemicals that are actually harmful to your blood vessels."

"When you couple this harmful shift with the loss of estrogen, the protective shield around a woman's heart begins to crack, fundamentally changing her metabolic and cardiovascular health."

While large-scale longitudinal studies show that the 'average' woman gains about 1 to 2.2 kg during this time, Dr Rigas stressed that tracking numbers on a scale misses the point entirely.

"Averages don't tell the whole story. Every single woman's experience is unique and must be validated," she noted. "When patients come into my clinic and say, 'I have put on 8 to 10 kilos in just a few months, and I haven't changed a single thing — I still eat the same, and I'm exercising, but it's not working anymore,' I believe them."

"Your body has fundamentally rewritten its operational rules. The real shift is a dramatic change in body composition. Your metabolism has changed how it processes energy, meaning you can lose lean, metabolic muscle while rapidly gaining visceral belly fat."

"Your clothes fit completely differently because the underlying biology has shifted, even if you are doing everything right. With this comes a series of potential health issues if not nipped in the bud early on."

The nutritional side of it.

If the medical reality is that our biology has shifted, the next rulebook to be thrown out is the one dictating restriction.

Goodness, it's useless.

For decades, diet culture taught women that the only response to a changing body was subtraction—from cutting calories to skipping meals and eliminating entire food groups. (Looking at you, carbs).

However, during menopause, chronic dieting can actively work against you.

It's literally science.

According to menopause dietitian Nigel Denby, CEO of Harley Street at Home, the biggest shift women need to make is moving away from eating less and toward eating smarter.

"Many women tell me they feel as though their metabolism has suddenly 'broken' during perimenopause," Denby said.

"In reality, several things are happening at once. Hormonal changes alter where we store fat; we naturally begin to lose muscle mass, and sleep disruption and stress make healthy choices harder. The answer isn't to eat as little as possible. Chronic dieting makes it harder to preserve muscle, increases hunger, and creates an unhealthy relationship with food."

Now, read that last line again.

Instead of restriction, Denby advises building a strong nutritional foundation focusing on abundance.

"Include a good source of protein at every meal to help preserve muscle mass, support strength, and improve satiety. Pair it with complex carbohydrates like oats, wholegrains, beans, and lentils for slow-release energy, and calcium-rich foods to protect bones as declining oestrogen accelerates bone loss."

Importantly, Denby urged women to stop looking at food through the single, punishing lens of weight loss.

"Nutrition in menopause should be about supporting energy, mood, bone health, heart health, and digestive health. Weight may improve as a consequence, but it shouldn't be the only measure of success."

This shift requires stepping away from self-blame, especially when stress and fatigue trigger emotional eating.

"When you're sleeping badly because of night sweats, or juggling work and family, your brain naturally seeks quick sources of energy and comfort," Denby said.

"That's biology, not a lack of willpower. Banning foods usually makes things worse, fuelling an unhelpful cycle of 'being good' followed by 'falling off the wagon.' Become curious rather than critical. Healthy eating isn't about perfection; it's about consistency over time."

And look, it turns out the wagon was a terrible place to sit anyway.

How movement matters.

The final rule that breaks in our 40s is how we exercise.

The knee-jerk reaction to a changing midsection is often to punish the body into submission.

You know the drill.

Whether that might be stepping up the high-intensity cardio, running further, or performing endless, gruelling core circuits in a desperate bid to 'spot reduce' abdominal fat.

But according to women's fitness and mindset coach Carly Stuart, this 30-something playbook actively works against a midlife body.

"I talk to so many women each day who spend hours doing hard-core HIIT sessions, smashing themselves on the treadmill, and doing endless amounts of ab exercises, who are so incredibly frustrated because the results are not reflecting their efforts," Stuart said.

"They end up completely burnt out, feel like an absolute failure, and wholeheartedly believe that their body and metabolism are broken, which is not accurate."

Instead of punishing the body with cardio, Stuart noted that the drop in oestrogen and the subsequent risk of accelerated muscle loss actually means the goal of movement must pivot from burning calories to preserving and building muscle.

"Resistance training will help slow or even reverse that decline," Stuart explained.

"Having a decent amount of lean muscle on a woman's body is going to be the best long-term weight management strategy there ever is, because muscle is what supports the metabolism. Aside from the metabolic benefits, strength training improves bone density, joint health, and reduces the risk of falls and fractures later in life."

As Stuart told us, building muscle in your 40s and beyond takes more than strength training alone. And it requires a massive mental shift away from aesthetics and toward long-term longevity.

"We need to stop focusing on just aesthetics and training for the body we want today, and start training for the woman we want to be in our 70s and 80s so we can stay independent for as long as possible," Stuart said.

"Let's reframe 'I have to work out' to 'I get to work out.' Many women have spent decades chasing a smaller body, which usually means a weaker and faster-declining body. Let's focus on building a healthier, more capable body."

"Stop obsessing over 'burned calories' or a 'scale number' and instead ask yourself: Am I getting stronger? Am I sleeping better? Has my energy improved? Do I feel more confident? If you show up consistently and messy each day, the results won't have a choice."

The midlife myth.

With so much conflicting information on social media, particularly when it comes to women's health (it's the Wild West out there), it can be easy to feel entirely defeated by your own biology. Like it's a problem you've created yourself.

But as our experts all agree, while the rules have changed, your body isn't actually working against you. It's just entering a new season.

Both Denby and Stuart told us that the single biggest midlife fitness myth is the belief that your metabolism is permanently broken, or that a changing body is a sign of personal laziness.

And it couldn't be further from the truth.

"The biggest myth is that 'perimenopause belly' happens because women have become lazy or lost their self-control," Denby said.

Predictably, this is not just inaccurate — it's a myth that keeps us trapped in a cycle of shame.

Dr Rigas agreed, noting that the old health paradigms are decades out of date. "The old 'eat less, move more' rulebook was completely thrown out more than 25 years ago, and this is absolutely not something you just have to tolerate," she said.

"This transition is so much more than brain fog, hot flashes and changes in our appearance. The hormonal shift is the catalyst for a significant shift in your underlying cardiovascular risk, your metabolic health, and your everyday quality of life."

"Changes in abdominal fat distribution are a recognised consequence of declining oestrogen," Denby added.

"What concerns me more is the flood of social media influencers promising to 'melt perimenopause belly' with detoxes, supplements, or miracle diets. There is no evidence that any specific food, supplement, or exercise can selectively burn fat from one part of the body."

Stuart backed this sentiment, noting that while the physiological shifts are very real, fat loss isn't impossible. It just requires a strategy that evolves with you.

"Hormones influence where fat is stored, your sleep routines, your appetite, and how you feel each day," she said.

"But honestly, it's usually the behaviours associated with perimenopause that stack the odds. You have disrupted sleep, so you feel more tired. Because you're tired, you tend to move less and have less willpower. You're just in a different season of life."

To navigate this season, Stuart said your framework should prioritise strength training, eating more protein, staying active, managing stress, and protecting your sleep where possible.

"I have worked with thousands of women in their 40s, 50s, and beyond who are building muscle, losing body fat, and feeling stronger and more confident than they have in years."

The new approach.

The takeaway here is simple: the midlife shift isn't a design flaw or a biological failure. It's just a clear signal that it's time to change how you look after yourself.

The rules of our 30s, built largely on the shaky foundations of aesthetics, restriction, and high-stress energy deficits, stop working because they are no longer sustainable for a body that requires nourishment, muscle protection, and metabolic care.

Dr Rigas emphasised that this realignment is a vital clinical window for long-term survival.

"We have to talk about the heart: when women experience a cardiovascular event, they often present with completely different symptoms than men," she warned.

"Because of this, women are historically under-diagnosed, under-treated, and suffer poorer medical outcomes. This dangerous narrative needs to change, and raising awareness during menopause is the vital first step."

"Because the heart's protective shield alters during this transition, midsection weight gain is an important marker for an increased risk of insulin resistance, high blood pressure, and cardiovascular disease. But here is the positive news: menopause is not a time of defeat. It is a vital health pivot and a powerful opportunity to practice proactive healthy ageing."

"By seeking expert, evidence-based care to protect your heart and change your metabolic strategy, you aren't just managing weight—you are actively retaining your physical independence, protecting your vitality, and ensuring you get to fully enjoy the vibrant retirement you have worked so hard for and truly deserve."

"Perimenopause is not a signal that your body has failed," Denby reminded us. "It's a new life stage that asks us to care for our bodies differently. Nutrition shouldn't be about fighting your body; it should be about giving it the support it needs to thrive."

When we stop viewing 'perimenopause belly' as a failure, we can finally stop feeling guilty and actually give our bodies the strength, fuel, and grace they need to thrive.

Get access to Very Peri, Mamamia's exclusive perimenopause series, for just $59. 25 world-leading experts, over 20 on-demand sessions, available now. We've sorted through the noise so you don't have to. Go to veryperi.com.au and join me today. You hot? Same.

Disclaimer: This article provides general educational information and expert commentary. Perimenopause transitions affect every individual differently; please consult your trusted healthcare professional or GP for personalised medical and metabolic advice.

Feature image: Getty.