Visceral fat: what it is, why it matters and how far you can check it at home

What is visceral fat?

The BHF separates body fat into two kinds. Subcutaneous fat sits under the skin, and you can feel it. Visceral fat builds up around your organs.¹

The BHF says visceral fat is linked to high cholesterol, high blood pressure and type 2 diabetes.¹ It explains that excess fat in the liver can pump out too much fat and sugar into the blood, which raises the risk of coronary heart disease and type 2 diabetes.¹ Diabetes UK describes the same idea from the diabetes side: carrying extra weight around the middle means fat can build up around organs such as the liver and pancreas, which can cause insulin resistance.⁶

NICE lists type 2 diabetes, hypertension and cardiovascular disease as the risks linked to higher central adiposity.⁵ The International Atherosclerosis Society goes further and calls visceral fat, when accurately measured by CT or MRI, an independent risk marker for cardiovascular and metabolic disease.⁷

A healthy BMI does not rule it out. The BHF says you can have a healthy BMI and still carry excess fat around the belly, with a risk of heart and circulatory disease and type 2 diabetes.² Diabetes UK makes the same point: even with a healthy BMI, a large waist measurement can still mean a risk of type 2 diabetes.⁶

How can you tell how much you have?

The accurate answer is a scan. The International Atherosclerosis Society statement says visceral fat is accurately measured by CT or MRI, and it also says there is a need for simple tools that can monitor changes in visceral and ectopic fat over time.⁷ In other words, researchers want something simpler too. The table sets out what exists.

The practical conclusion is straightforward. At home, the tape measure is the tool the BHF, NICE and Diabetes UK actually talk about. The scale’s visceral number is a different thing, covered below.

What thresholds do the sources use for waist and height?

NICE guideline NG246 sorts waist-to-height ratio into three bands for adults with a BMI under 35, of both sexes and all ethnicities: 0.4 to 0.49 healthy, 0.5 to 0.59 increased central adiposity and 0.6 or more high.⁵ The BHF uses the same bands.¹ NICE also says to tell people to try to keep their waist to less than half their height,⁵ and the NHS gives the same advice.⁴

Diabetes UK uses a different yardstick, an absolute waist size: under 80 cm (31.5 in) for all women, under 94 cm (37 in) for most men and under 90 cm (35 in) for South Asian men.⁶ These do not translate into the ratio bands, so keep the two systems apart. Diabetes UK also says to measure midway between the top of the hip bone and the bottom of the ribcage, and that waist size is not usually the same as jean size.⁶ The full routine is in the guide to waist measurement.

The ratio has limits. The NHS says not to use the calculator if you are pregnant, have been diagnosed with an eating disorder, have a BMI over 35 (adults aged 18 and over) or are under 5.³ For those cases, speak to a health professional.

A worked example in inches and centimetres

These numbers are invented to show the arithmetic. Someone is 5 ft 9 in tall, which is 69 in or about 175 cm. Half their height is 34.5 in, or 87.5 cm at 175 cm. Their waist is 36 in, which is 91.4 cm.

1. Ratio in inches: 36 divided by 69 is 0.52.
2. Ratio in centimetres: 91.4 divided by 175 is also 0.52.
3. NICE band: 0.5 to 0.59, increased.
4. Gap to half height: 36 minus 34.5 is 1.5 in, or about 3.8 cm.

Notice that the same 36 in waist is under Diabetes UK’s 94 cm target for most men, yet the ratio sits in NICE’s increased band. Neither is wrong. They are different tests, and the BHF and NICE favour the ratio because it allows for height.¹⁵

What does a scale’s visceral fat level mean?

Many body composition scales show a visceral fat number. It is not a scan. It is an index calculated by the maker from bio-impedance and the details you enter. Chutex says on the Vita page that the scale gives a “visceral fat (deep abdominal index)” at each weigh-in, that it treats visceral fat as a metabolic risk marker, and that it provides no medical diagnosis.¹⁴

Two cautions apply. First, no independent validation of any scale’s visceral fat index was found in the sources checked for this guide, so the number cannot be compared with a scan. Second, NICE says not to use bioimpedance as a substitute for BMI as a measure of general adiposity in adults.⁵ For how far scale estimates can drift on body fat, see smart scale accuracy.

If you do use the number, use it as a trend in the same conditions each time, and set it beside your waist-to-height ratio. If the two move together, that is mildly reassuring. If they disagree, trust the tape measure. And if you have a pacemaker, the BHF advises avoiding electronic body fat scales completely.¹⁵

What does research say changes visceral fat?

The plain answer from the BHF is that you cannot target fat round your middle with exercise. Sit-ups and crunches strengthen the abdominal muscles but will not significantly reduce the fat on top of them.¹¹ The only way to lose fat around the middle is to lose overall body fat, and aerobic exercise is the most effective type.¹¹

The UK guidelines the BHF cites are at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous activity a week.¹¹ The NHS adds strengthening activities that work all the major muscle groups on at least 2 days a week.¹² Diabetes UK says there are no quick fixes for reducing waist size and that it comes down to eating well and moving more.⁶

What the studies add

• A meta-analysis of 117 studies with 4,815 people found that both exercise and diet reduce visceral fat. Without weight loss, exercise was linked to a 6.1% fall in visceral fat and diet to 1.1%. Total weight loss did not necessarily reflect changes in visceral fat.⁸ These are group averages.
• In a 2026 Circulation analysis of two trials (366 people, MRI at 5 and 10 years), a 10% loss of visceral fat was linked to a 28% lower risk of developing type 2 diabetes, even after weight regain.⁹ This is an association, not proof of cause.
• In a 21-day inpatient crossover trial of 12 healthy, non-obese adults, a 14-day period with a 4-hour sleep opportunity increased abdominal fat, including visceral fat, compared with a 9-hour opportunity, with free access to food.¹⁰ The sample is tiny, so it is a prompt for more research, not advice.

None of these amounts to a promise that a particular plan will shrink your own visceral fat. They show that activity and overall fat loss are the routes the evidence points to, and that your waist-to-height ratio is the practical thing to watch.

Frequently asked questions