The number on the scale doesn’t tell the whole story.

A new report from the Australian Institute of Health and Welfare has highlighted something worth paying attention to.

In 2022–24, 55% of Australian adults aged 45–54 were living with abdominal obesity, measured by waist circumference.

That compares with 46% of adults of the same age in 2011–12.

In other words, more than 1 in 2 Australians aged 45–54 now fall within the abdominal obesity range used by the AIHW.

But this conversation should not simply be about appearance.

It is about where body fat is carried, what that may mean for health, and why body weight alone can miss an important part of the picture.

What is abdominal obesity?

Body fat is not stored in exactly the same way throughout the body.

Some fat sits underneath the skin. Some is stored deeper within the abdominal area around internal organs. This deeper fat is often called visceral fat.

Waist circumference does not directly measure visceral fat, but it provides a useful indication of abdominal fat distribution and the level of internal fat deposits around organs. The AIHW notes that higher waist circumference is associated with an increased risk of chronic disease.

For its current reporting, the AIHW defines abdominal obesity as a waist circumference of:

• 102 cm or more for men
• 88 cm or more for women

At these levels, metabolic health risk is considered substantially increased.

These measurements are population level reference points rather than a diagnosis of an individual person.

They are one piece of information.

Why does your waist matter?

Two people can weigh exactly the same amount and have very different body compositions and patterns of fat distribution.

This is why looking only at kilograms can be misleading.

According to the AIHW, waist circumference provides information about body fat distribution, while BMI gives an indication of overall body size. Using both measures can provide a more complete picture than either measure alone.

The Heart Foundation also describes waist measurement as an indicator of internal fat deposits and notes the relationship between excess abdominal fat and cardiovascular risk.

This is why someone can see relatively little movement on the scale while still having changes worth paying attention to elsewhere.

The scale tells us what happened. It doesn’t always tell us why.

Body weight includes much more than body fat.

It is influenced by muscle, body water, food and fluid intake, digestive contents and normal day to day fluctuations.

So when your weight changes, the scale cannot tell you which part of your body changed.

And when your weight barely changes, that does not automatically mean nothing is happening.

This is particularly relevant when we look at movement.

A systematic review published in Obesity Reviews found that regular aerobic exercise was associated with modest reductions in waist circumference and visceral adipose tissue.

A larger meta analysis of randomised clinical trials also found that aerobic exercise was associated with reductions in weight, waist circumference and body fat measures, with greater amounts of exercise generally associated with greater reductions.

You can read the research here:

Effect of aerobic exercise on waist circumference in adults, PubMed

Aerobic exercise and weight loss in adults, PubMed

The important message is not that everyone needs to suddenly become a gym person.

It is that movement matters, even when the scale is not changing dramatically.

Health is bigger than a workout

Australia’s newly updated 24-hour movement guidelines take a broader view of health.

Instead of looking only at structured exercise, the recommendations consider physical activity, strength, sedentary behaviour and sleep across the whole day.

For adults aged 18–64, the Australian Government currently recommends being active most days, muscle strengthening activities on at least two days each week, limiting prolonged sedentary time, breaking up sitting regularly and aiming for 7–9 hours of good quality sleep.

That gives us a much better conversation than simply asking:

“Did you exercise today?”

We can also ask:

• How much are you moving?
• How long are you sitting?
• How are you sleeping?
• Are you maintaining your strength?
• What has changed in your everyday routine?

Why is this particularly interesting after 40?

The AIHW data shows a clear difference in abdominal obesity among adults aged 45–54 over time.

In 2011–12, 46% of adults in this age group met the abdominal obesity definition.

By 2022–24, that had increased to 55%.

This does not mean that increasing waist circumference is simply an unavoidable part of getting older.

It does suggest that midlife is a useful time to start looking beyond body weight.

Instead of asking only:

“How much do I weigh?”

It may be more useful to ask:

“What is changing in my body?”

What should we look at besides kilograms?

At InnoShape, we prefer to look at progress from several angles:

Waist circumference. Is the measurement changing over time?

Body composition. What is happening with body fat, muscle and other body composition measures?

Movement. How much are you actually moving during an ordinary day?

Lifestyle. What is happening with sleep, stress, eating patterns, sitting time and recovery?

Function. Are your clothes fitting differently? Are you moving more comfortably? Do you feel stronger or more energetic?

No single measurement gives us the complete answer.

Together, they give us a much better picture.

Start with understanding

If your weight has barely changed but you are concerned about your waistline, the answer does not automatically have to be eating dramatically less or exercising dramatically harder.

Start by understanding what is happening.

1. Measure your waist.
2. Review your body composition.
3. Look at your movement.
4. Look at your sleep and lifestyle.
5. Look at what has changed.
6. Then decide what actually needs attention.

Because sometimes the scale is telling the truth.

It just isn’t telling you the whole truth.

Want to understand your own numbers?

If you have been thinking:

“My weight hasn’t changed much, but I’d really like to do something about my waistline.”

Let’s have a look at it properly.

At InnoShape, we can measure your waist circumference, review your body composition and talk through practical next steps based on the bigger picture.

Book a Body Composition & Waist Review

Or simply contact InnoShape and say WAIST.

References and further reading

Australian Institute of Health and Welfare: Overweight and obesity

AIHW: How many Australians are living with overweight and obesity?

Heart Foundation: Waist measurement and heart health

Australian Government: 24-hour movement guidelines for adults

PubMed: Effect of aerobic exercise on waist circumference in adults

PubMed: Aerobic exercise and weight loss in adults

This article provides general health and lifestyle information and is not intended to diagnose or treat a medical condition. Waist circumference and body composition measurements are health indicators and should be considered alongside individual health circumstances. If you have a medical condition or concerns about your health, speak with your GP or appropriate healthcare professional.