What waist measurement indicates metabolic risk for women?

Australian clinical guidelines, including those from the Heart Foundation and RACGP, use a waist circumference of 80cm or above in women as the threshold for increased cardiometabolic risk, and 88cm or above for substantially increased risk. These thresholds apply regardless of BMI — you can have a normal BMI and still carry significant visceral fat if your waist circumference is elevated. Waist measurement is straightforward to do at home with a tape measure: measure at the midpoint between your lowest rib and the top of your hip bone, at the end of a normal exhale. This is a more direct marker of metabolic risk than weight alone and is worth asking your GP to record at your next visit.

Why is abdominal fat more dangerous than fat elsewhere in the body?

Visceral fat — the fat stored around and between the abdominal organs — is metabolically active in a way that subcutaneous fat (fat stored beneath the skin) is not. Visceral fat sits close to the portal circulation and releases inflammatory cytokines and free fatty acids directly into the liver, driving insulin resistance, elevated triglycerides, low HDL cholesterol, and raised blood pressure. This cluster is what defines metabolic syndrome. Subcutaneous fat, particularly in the hips and thighs, does not carry the same metabolic risk and in some research appears to be metabolically protective. The location of fat storage — not just the total amount — determines much of the cardiovascular risk. This is why waist circumference is a more useful risk marker than weight or BMI in clinical practice.

Abdominal fat is now Australia's leading killer — the AIHW data explained

What just happened

A new report from the Australian Institute of Health and Welfare, released this week, has updated Australia’s picture of the obesity epidemic — and the headline figure is striking: adult abdominal obesity has nearly doubled over the past 30 years, rising from 25 per cent of the population in 1995 to 48 per cent in 2022–24.

RACGP newsGP reported on 24 June 2026 that overweight and obesity became Australia’s leading risk factor for death in 2024, accounting for approximately 19,000 deaths — one in every ten deaths recorded that year. The AIHW’s data release is what drove this framing: not a survey, not modelling, but an updated national burden of disease analysis.

The broader number — overall overweight and obesity prevalence — has held steady at around 67 per cent of Australian adults over the past six years. That might read as a plateau. It is not a reassuring one. What the AIHW data shows is that inside that stable headline rate, something is shifting: abdominal fat is rising even as total obesity rates hold. The distribution of fat is moving toward the more dangerous pattern, not away from it.

Dr Terri-Lynne South, Chair of the RACGP’s Specific Interests Obesity Management group, described the childhood trajectory as deeply concerning: young people are now developing type 2 diabetes and cardiovascular disease at ages that previous generations did not see these conditions. That is not a marginal shift — it is a structural change in disease chronology.

The both-and

Why abdominal fat is a different conversation from BMI

The distinction the AIHW report draws attention to is not semantic. Total body weight — and the BMI calculated from it — does not distinguish between where fat is stored. Abdominal obesity specifically refers to visceral adiposity: fat deposited around and between the abdominal organs, not subcutaneously beneath the skin.

Visceral fat is metabolically active in a different way from subcutaneous fat. It is closer to the portal circulation, releases inflammatory cytokines directly into the liver, and is associated with insulin resistance, elevated triglycerides, low HDL cholesterol, and raised blood pressure — the cluster that defines metabolic syndrome. This is why waist circumference is a more direct predictor of cardiometabolic risk than BMI in many adult populations, particularly in people who are of normal weight but carry central adiposity.

Australian clinical guidelines use a waist circumference above 80cm in women, or 94cm in men, as the threshold for increased risk. This is a vascular risk measure that your GP can record in three seconds with a tape measure. Many people have not had it recorded at a consultation in years — or ever.

The near-doubling of abdominal obesity from 25 to 48 per cent since 1995 is a signal that something has changed in the environment — not in individual willpower. The dietary, activity, sleep, and stress-load environment for Australian adults in 2024 is not the same environment that existed in 1995. Cortisol-driven central fat deposition is a real and measurable physiological process. Treating the rise in abdominal obesity as a personal failing misreads both the data and the biology.

What the plateau in overall obesity rates actually means

The fact that overall overweight and obesity prevalence has not increased dramatically in six years is sometimes cited as evidence that public health messaging is working, or that rates have stabilised. The AIHW data complicates that reading.

If abdominal obesity is rising while overall rates plateau, the distribution of fat within people who are already overweight or obese is shifting toward the more dangerous pattern. Weight is redistributing toward the viscera — the tissue that most directly affects cardiometabolic risk. That is a compositional change story within the same aggregate number, not a stabilisation story.

The childhood trajectory

The AIHW report also updated childhood figures: overweight and obesity in Australian children rose from 20 per cent in 1995 to 27 per cent in 2022–24. Children are entering adult life at higher baseline adiposity than previous generations, which compresses the timeline for cardiometabolic consequences. Dr South’s point about early-onset diabetes and cardiovascular disease is not hypothetical — it is showing up in paediatric endocrinology clinics.

For parents: this is documentation of what the modern food environment does to metabolic trajectories when not actively countered. The RACGP’s guidance is that annual healthy child checks — monitoring nutrition, physical activity, sleep, and growth patterns — should continue beyond age four, particularly in households with a family history of cardiometabolic disease. The counter is not perfection; it is awareness and early identification of the individuals who are already tracking toward risk.

2 cents

If you are 45 and have not had a waist circumference measurement recorded at a GP visit recently: ask for one at your next appointment. It takes a moment and gives you a more meaningful metabolic risk number than your weight alone.

The cardiometabolic conversation that makes sense at midlife is not one that should wait for a diabetes diagnosis or a cardiovascular event. A fasting glucose, a fasting lipid panel, and a waist circumference measurement, reviewed by a GP who understands how these numbers interact, is the minimum picture worth having. If abdominal fat has been shifting upward — even with a stable overall weight — that is a conversation worth having now, not later.

The AIHW data is telling us the risk landscape shifted, and shifted earlier than previous generations experienced. That is not a reason for alarm — it is a reason to know where you sit.

Verdict: yes — worth knowing about.

Sources cited

RACGP newsGP — Obesity rates ‘a worry for our health future’. 24 June 2026. https://www1.racgp.org.au/newsgp/clinical/obesity-rates-a-worry-for-our-health-future
Australian Institute of Health and Welfare — Overweight and obesity: an overview. https://www.aihw.gov.au/reports/overweight-obesity/overweight-and-obesity-an-overview/contents/overweight-and-obesity
Heart Foundation Australia — Waist measurement. https://www.heartfoundation.org.au/heart-health-education/waist-measurement