Why women over 40 are gaining belly fat even when they're eating less

If you're over 40, eating healthier than ever and still noticing extra weight around your tummy, you're certainly not alone.

Perhaps you've cut back on your portions, stopped eating so many treats or started exercising more. Yet your jeans feel tighter, your waistline is changing and the things that worked for weight loss in your 20s and 30s don't seem to work quite the same way anymore.

It's a frustrating experience for many women, particularly during perimenopause and menopause.

But here's something important to understand: your body is changing, and your approach to looking after it may need to change too.

Hormones, muscle mass, sleep, activity levels and nutrition can all influence your weight and where your body stores fat.

The good news? There are practical, evidence-based things you can do to support your metabolism, protect your muscle mass and improve your long-term health.

Let's look at what's really happening.

Why does belly fat increase after 40?

As women move through their 40s and 50s, several changes can occur simultaneously.

One of the biggest is the gradual decline in oestrogen associated with menopause.

Oestrogen influences where fat is stored in the body. Before menopause, women tend to store more fat around their hips and thighs. As oestrogen levels decline, fat storage often shifts towards the abdomen.

This means you might notice your waistline increasing even if your overall weight hasn't changed dramatically.

Ageing also plays an important role. We can gradually lose muscle mass as we get older, particularly if we're not regularly doing strength-based exercise.

Because muscle contributes to the energy your body uses, changes in muscle mass, daily movement and overall energy expenditure can make weight management more challenging.

Importantly, menopause itself isn't the sole cause of midlife weight gain. Ageing, lifestyle and hormonal changes all contribute.

1. You may be losing muscle without realising it

Muscle isn't just important for looking toned or feeling strong.

It's essential for healthy ageing, movement, balance, bone health and metabolic function.

As we get older, we can gradually lose muscle, especially if we aren't doing resistance exercise or eating enough protein.

When muscle mass declines, our daily energy needs may also change.

This means that eating the same amount of food you did ten years ago may no longer have the same effect on your weight.

What can help?

• Include protein-rich foods in your meals.

• Aim for strength training at least twice a week.

• Stay active throughout the day.

• Avoid crash diets that may make it harder to preserve muscle.

You don't need to spend hours lifting heavy weights. Simple resistance exercises using dumbbells, resistance bands or your own body weight can be an excellent place to start.

Try this with Zing Wellbeing: Our app includes guided workouts to help women build strength, improve fitness and stay active at home. You can choose exercises that suit your experience and fitness level.

2. You might not be eating enough protein

This is one of the most important nutritional considerations for women over 40.

In September 2026, Australia's national science agency, CSIRO, highlighted a protein intake gap among women aged 40–55.

Its analysis suggested that women in this age group were consuming approximately 35g less protein per day than a proposed optimal intake of 1.2g per kilogram of body weight.

Why does this matter?

Protein helps your body maintain and repair muscle tissue. It can also help you feel satisfied after eating, which may make it easier to manage hunger.

And during midlife, preserving muscle becomes particularly important.

Simple ways to include more protein:

• Add Greek yoghurt, eggs or cottage cheese to breakfast.

• Include chicken, fish, tofu, lentils or lean meat at lunch and dinner.

• Choose protein-rich snacks when you're hungry.

• Use a protein smoothie when you need a convenient option.

For example, a breakfast of toast and jam might contain relatively little protein, whereas Greek yoghurt with berries and nuts, or eggs on wholegrain toast, can provide a more substantial amount.

Protein requirements vary depending on your body weight, activity levels and medical circumstances. You don't need to force yourself to eat a particular amount, but it is worth checking whether you're getting enough.

Make it easier with Zing Wellbeing: Our Wellness Smoothie provides 32g of protein per serve, making it a convenient option for busy mornings. It also contains added vitamins and minerals.

You can also use the Zing Wellbeing app to explore high-protein recipes and meal plans that make protein easier to include throughout the day.

3. Poor sleep could be making things harder

If you've started waking during the night, struggling to fall asleep or experiencing night sweats, you're not alone.

Sleep disruption is particularly common during perimenopause and menopause.

And unfortunately, consistently poor sleep can make weight management more difficult.

Not getting enough quality sleep can affect hunger, appetite, energy levels and the motivation to exercise.

It may also leave you reaching for convenient, energy-dense foods when you're exhausted.

What can help?

• Keep a consistent bedtime and wake-up time.

• Make your bedroom cool, dark and comfortable.

• Limit alcohol, particularly close to bedtime.

• Avoid caffeine late in the day if it affects your sleep.

• Build a relaxing evening routine.

If night sweats or ongoing insomnia are disrupting your life, speak with your GP about treatment options.

Zing Wellbeing tip: Try one of the guided meditations or relaxation sessions in the app as part of your evening wind-down routine.

4. Eating less isn't always the best strategy

When the scales start creeping up, it's natural to think the answer is simply to eat less.

And while overall energy intake does matter for weight management, cutting food too aggressively can create other problems.

Very restrictive diets may leave you hungry, tired and struggling to get enough protein, fibre and essential nutrients.

They can also make it harder to maintain muscle, particularly when combined with inadequate protein and no strength training.

Instead of focusing only on reducing portions, consider the nutritional quality of your meals.

Try building meals around:

• A good source of protein

• Plenty of vegetables

• Fibre-rich carbohydrates such as oats, legumes or wholegrains

• Healthy fats such as olive oil, nuts and avocado

This approach can help you feel more satisfied while supporting your overall health.

And remember, you don't need to eliminate carbohydrates or follow an extreme diet to make progress.

Try this with Zing Wellbeing: Our app includes more than 100 nutritionist-developed meal plans, including high-protein and lower-carbohydrate options. You can customise your meals to suit your preferences and lifestyle.

5. Your stress levels may be affecting your habits

Life in your 40s and 50s can be incredibly busy.

Work, family responsibilities, ageing parents, relationships and hormonal changes can all contribute to feeling overwhelmed.

Stress can influence sleep, appetite, emotional eating and your motivation to exercise.

Cortisol, a hormone involved in the body's stress response, also plays a role in metabolism. However, it's important not to assume that ordinary stress or elevated cortisol is the direct cause of belly fat.

Rather than trying to eliminate stress completely, focus on small ways to manage it.

A few things that may help:

• Take a short walk outside each day.

• Practise deep breathing or mindfulness.

• Schedule time for activities you enjoy.

• Aim for consistent sleep.

• Ask for support when life feels overwhelming.

Even ten minutes of quiet time can be a valuable part of your daily wellbeing routine.

6. Walking is fantastic, but strength training matters too

Walking is one of the simplest ways to support your health.

It's accessible, inexpensive and beneficial for your cardiovascular fitness, mood and general wellbeing.

But if you're only walking and never doing strength-based exercise, you may be missing an important opportunity to protect your muscles as you age.

Australian physical activity guidelines recommend adults aim for at least 150 minutes of moderate-intensity activity each week, along with muscle-strengthening activities on at least two days.

That doesn't mean you need an expensive gym membership.

You could start with simple movements such as:

• Squats to a chair

• Wall push-ups

• Resistance-band rows

• Light dumbbell exercises

• Step-ups

Start at a level that feels manageable and gradually build your strength.

Consistency is far more important than trying to do everything perfectly.

7. Alcohol may be contributing more than you realise

A glass of wine at the end of a busy day can feel like a well-earned reward.

But alcohol can influence weight management in several ways.

It provides additional energy, may affect food choices and can disrupt sleep quality.

For women already struggling with night sweats or poor sleep, alcohol may also make some menopausal symptoms worse.

You don't necessarily need to change everything overnight.

Consider experimenting with more alcohol-free evenings, smaller serves or different ways to unwind.

You might be surprised by the difference this makes to your sleep, energy and general wellbeing.

Can you actually lose menopause belly fat?

Yes, it is possible to reduce overall body fat during and after menopause.

However, there is no special food, supplement or exercise that specifically targets belly fat.

Crunches and abdominal exercises can strengthen your core, but they won't selectively remove fat from your tummy.

The most effective approach is generally to combine sustainable nutrition habits, regular movement, strength training and adequate sleep.

For some women, a modest, sustainable energy deficit may also be appropriate if weight loss is their goal.

It's equally important to remember that changes in your body during midlife are normal. Your health is about much more than the number on the scales.

You can access 70+ tummy recipes in our book too

A simple 7-day plan to get started

If you're feeling overwhelmed, don't try to change everything at once.

Here are seven simple actions you can try over the next week.

Day 1: Look at your protein intake. Check whether you're including a protein source at breakfast, lunch and dinner.

Day 2: Take a 30-minute walk. Break it into shorter walks if that's easier.

Day 3: Try a beginner strength workout. Start with 15–20 minutes of manageable exercises.

Day 4: Improve one meal. Add extra vegetables, protein or fibre to a meal you already enjoy.

Day 5: Prioritise sleep. Set aside time for a relaxing evening routine.

Day 6: Try an alcohol-free evening. Replace your usual drink with sparkling water, herbal tea or another favourite option.

Day 7: Reflect on your progress. Notice your energy, sleep, strength and how you feel, rather than focusing only on your weight.

You don't need to complete these perfectly. The aim is to build small, realistic habits that you can maintain.

Rhian also lost her tummy fat whilst using the Zing Wellbeing plans and being in menopause

How Zing Wellbeing can help you feel healthier and stronger after 40

At Zing Wellbeing, we believe women's health should be about so much more than weight loss.

Our approach brings together nutrition, fitness, mental wellbeing and practical support to help you build healthier habits that work with your lifestyle.

Inside the Zing Wellbeing app, you'll find:

• More than 2,000 healthy recipes, including high-protein meals, family-friendly dinners and nutritious snacks.

• More than 100 nutritionist-developed meal plans that you can customise.

• Guided workouts to help support strength and fitness.

• Meditation and wellbeing resources.

• Progress trackers to help you monitor your journey.

• Expert coaching, education and support.

Whether your goal is to improve your nutrition, feel stronger, manage your weight or simply have more energy, we're here to help you take the next step.

Explore the Zing Wellbeing app and discover a healthier approach to feeling your best after 40.

Frequently asked questions

Why am I suddenly gaining belly fat at 45?

Changes in oestrogen, ageing, muscle mass, sleep and lifestyle can all contribute to increased abdominal fat during your 40s. Menopause can change where your body stores fat, even if your overall weight doesn't change significantly.

Does menopause cause belly fat?

Menopause-related hormonal changes can encourage a shift towards abdominal fat storage. However, overall weight gain in midlife is also influenced by ageing, activity levels, nutrition and other factors.

Can walking reduce belly fat after 40?

Walking can support overall fat loss when combined with appropriate nutrition and other healthy habits. Adding strength training can also help preserve muscle and improve physical health.

What foods help with belly fat after 40?

No individual food burns belly fat. A balanced eating pattern that includes adequate protein, vegetables, fruit, wholegrains, legumes and healthy fats can support weight management and long-term health.

How much protein should a woman over 40 eat?

Protein needs depend on factors including body weight, health and activity. CSIRO has highlighted 1.2g per kilogram of body weight per day as a useful target for many women aged 40–55, although individual requirements differ. Women with kidney disease or other relevant medical conditions should seek personalised advice.

Does hormone replacement therapy help with belly fat?

Menopausal hormone therapy may help limit some changes in abdominal fat distribution, but it isn't prescribed as a weight-loss treatment. Its main role is managing menopause symptoms, and treatment decisions should be discussed with a healthcare professional.

Important: This article provides general health information and isn't a substitute for personalised medical advice. If you experience rapid or unexplained weight gain, persistent abdominal swelling, or other concerning symptoms, speak with your GP

Article sources.

CSIRO – The protein gap during menopause
Jean Hailes – Menopause and weight