What causes visceral fat, and why is it so dangerous? Explore the latest science on diet, insulin resistance, inflammation, cholesterol, genetics and how visceral fat is measured and reduced.
You can be slim and carry too much of it.
You can be overweight and carry surprisingly little.
You can exercise regularly, have a normal BMI and look healthy, yet still develop insulin resistance, fatty liver or cardiovascular disease.
The difference may lie not simply in how much fat you carry, but where your body puts it.
Deep inside the abdomen, surrounding the intestines and other organs, lies visceral adipose tissue. In normal amounts, it is part of healthy anatomy. But when this compartment expands and becomes dysfunctional, fat is no longer simply an energy store.
It begins behaving as an endocrine and immune organ, releasing fatty acids and signalling molecules, communicating with the liver and influencing insulin sensitivity, inflammation and blood lipids.[1–4]
This makes visceral fat an important next chapter in our metabolic story.
Because after metabolic flexibility begins to deteriorate and insulin resistance develops, another question becomes critical:
Where does the body put the excess energy?
Imagine adipose tissue as the body’s warehouse system.
Subcutaneous fat, particularly around the hips, thighs, and buttocks, can provide relatively safe storage. Healthy adipose tissue can enlarge existing fat cells and recruit new ones, storing triglycerides while keeping it away from organs where it can cause trouble.[1–3]
But storage capacity differs between people.
If subcutaneous adipose tissue becomes hypertrophic, inflamed or fibrotic, or simply cannot expand sufficiently, incoming energy increasingly spills into less desirable locations: visceral fat, liver, muscle and pancreas.
The warehouse has reached capacity, and deliveries are being left in the corridors.
This adipose expandability concept helps explain why some people can carry considerable body fat while remaining relatively insulin-sensitive, whereas others develop metabolic disease at a much lower BMI.[2–4]
It also corrects an important misconception: an excess of “healthy food” is not guaranteed to produce harmless subcutaneous fat. Persistent energy surplus can eventually overwhelm an individual’s storage capacity. Food quality matters, but so do genetics, hormones, activity and adipose biology.
What Creates Visceral Fat: Carbohydrate or Fat?
Both can. Carbohydrate can be converted into fatty acids through de novo lipogenesis, particularly during sustained carbohydrate overfeeding. High carbohydrate availability also increases carbohydrate oxidation and suppresses fat oxidation.[5,6]
Dietary fat has a more direct route into triglyceride storage because it already arrives as fatty acids.
So, asking whether carbohydrate or fat “turns into visceral fat” misses the more important question:
What determines where surplus energy is stored?
Controlled overfeeding experiments provide a fascinating answer.
In the Swedish LIPOGAIN study, healthy adults consumed similar excess calories and gained similar amounts of weight. But those overfed saturated fat accumulated substantially more liver fat and roughly twice as much visceral fat as those overfed polyunsaturated fat.[7]
Similar work has shown greater liver-fat accumulation with saturated-fat overfeeding than with unsaturated fat.[8]
So, calories strongly influence whether weight is gained, but nutrient composition can influence where that energy goes.
What Happens When High Carbohydrate Meets High Fat?
Real diets rarely consist of one macronutrient in isolation.
The more problematic modern combination is often refined carbohydrate plus energy-dense fat in highly palatable foods.
This creates an ideal environment for overconsumption while repeatedly supplying glucose, fatty acids and triglyceride-rich lipoproteins. Carbohydrate availability favours carbohydrate oxidation and suppresses fat oxidation, while dietary fat remains readily available for storage.[5,6]
There is another possible pathway.
Long-chain saturated fatty acids can activate inflammatory pathways within the hypothalamus, the brain region involved in appetite and energy regulation and experimental models show disruption of leptin and insulin signalling.[9]
The strongest mechanistic evidence remains animal-based, so claims that saturated fat simply “inflames the human appetite centre and makes us eat more” go beyond what has been established.
But the emerging picture is important: food quality may affect both how much energy we consume and how that energy is partitioned.
Does Dairy Fat Behave Differently?
This is where nutrition becomes more interesting than nutrient labels.
Saturated fat in an experimental oil cannot automatically be equated with yoghurt, milk or cheese.
Randomised and observational research has not shown a convincing increase in visceral adiposity specifically from full-fat dairy. Some observational studies even report inverse associations between dairy intake and abdominal obesity, although these cannot establish causation.[10,11]
That does not mean unlimited butter, cheese or cream is protective.
It means foods are biological packages, not isolated nutrients. Protein, calcium, fermentation, fatty-acid structure, the food matrix and, critically, what a food replaces may alter its metabolic effects.
When Visceral Fat Turns Against Us
As visceral adipocytes enlarge, their biology can change.
Blood supply may become inadequate. Cellular stress, fibrosis and adipocyte dysfunction increase. Macrophages and other immune cells accumulate, and secretion of inflammatory cytokines and adipokines changes.[1–4,12]
Visceral fat is also relatively lipolytically active, releasing fatty acids into circulation.
And its location matters.
Much of the venous drainage from important visceral depots enters the portal circulation, putting the liver directly downstream.
Think of the liver as a processing plant sitting beside a polluted river.
Increasing fatty-acid delivery and inflammatory signalling can promote liver fat, hepatic insulin resistance, increased glucose production and greater secretion of triglyceride-rich VLDL particles.[12,13]
This helps explain why visceral adiposity frequently travels with insulin resistance, fatty liver, elevated triglycerides, lower HDL and increased atherogenic ApoB-containing particles.
These are not unrelated abnormalities.
They are different expressions of a disturbed metabolic system.
Cholesterol, Visceral Fat and Statins
Visceral adiposity often produces atherogenic dyslipidaemia: high triglycerides, low HDL and increased numbers of ApoB-containing lipoproteins. LDL cholesterol itself may not always appear dramatically elevated.[13]
Statins remain highly effective drugs for reducing LDL cholesterol and cardiovascular events when clinically indicated.
But they do not treat the underlying visceral adiposity.
They address an important downstream cardiovascular risk.
Statins are also associated with a small increase in diabetes risk in susceptible individuals. This does not negate their cardiovascular benefit when appropriately prescribed, but it reinforces the distinction between treating circulating atherogenic lipoproteins and restoring metabolic health.
Why Some Bodies Store More Visceral Fat
Two people with identical BMI can have remarkably different internal fat distributions.
Genetics contributes substantially. Large imaging-genetics studies have identified numerous variants associated with visceral, abdominal subcutaneous and gluteofemoral fat distribution.[14]
Sex and hormones matter too. Men generally accumulate visceral fat more readily, while premenopausal women tend towards gluteofemoral storage. After menopause, declining oestrogen is associated with greater central and visceral adiposity.
Age, ethnicity, physical activity, sleep, stress hormones and insulin sensitivity also contribute.[3,14]
Body shape therefore gives clues that an expanding waist deserves attention, but it cannot reveal precisely what is happening internally.
And metabolic rate alone does not determine the destination of surplus energy.
How much energy you burn and where you store excess energy are related but different questions.
Does Low Visceral Fat Give an Athlete the All-Clear?
No. Low visceral fat is reassuring, but no single body-composition measurement proves metabolic health.
Athletes demonstrate this beautifully. Endurance-trained muscle can contain considerable intramuscular lipid while remaining highly insulin-sensitive the famous athlete’s paradox. Rapid lipid turnover and high mitochondrial oxidative capacity appear to make this fat biologically different from dysfunctional ectopic lipid accumulation.[15]
Conversely, a lean person can still develop fatty liver, dyslipidaemia, pancreatic dysfunction or insulin resistance.
Metabolic health is a system, not a visceral-fat score.
Can We Just Remove the Fat?
Liposuction provided an elegant experiment.
Researchers removed roughly 9–10 kg of abdominal subcutaneous fat from women, yet insulin sensitivity and major cardiovascular risk markers did not meaningfully improve.[16]
Why? Because removing subcutaneous fat did not correct the metabolic environment that produced the problem.
The warehouse was removed. The supply problem remained.
Metabolic bariatric surgery is fundamentally different.
Procedures such as gastric bypass and sleeve gastrectomy alter food intake, body weight, gut-hormone signalling, insulin sensitivity and nutrient flux. Visceral and liver fat fall substantially, often accompanied by major metabolic improvements.[17,18]
Importantly, visceral fat can respond disproportionately well to meaningful weight loss.
The mirror may show a modest change while the metabolic landscape inside has changed dramatically.
How Accurately Can We Measure Visceral Fat?
Consumer devices can create an illusion of precision.
Bioelectrical impedance (BIA) does not see visceral fat. It measures electrical properties and uses prediction equations based on variables including weight, height, age and sex. It may help track broad trends, but its “visceral fat score” is an estimate, not an anatomical measurement.[19]
DXA is considerably more sophisticated. Modern systems estimate visceral fat within the abdominal region and correlate reasonably strongly with imaging. However, recent 2026 comparisons with MRI show that DXA can systematically overestimate absolute visceral-fat volume despite good correlation.[20,21]
Correlation therefore does not mean interchangeability.
CT and MRI remain reference methods. CT provides excellent anatomical quantification but involves ionising radiation. MRI avoids radiation and can quantify visceral, subcutaneous, hepatic and other ectopic fat compartments in three dimensions.[19–22]
Most people, however, do not need repeated advanced imaging.
Waist circumference, alongside blood pressure, triglycerides, HDL, glucose regulation, liver markers, fitness, and longitudinal body composition, can provide highly useful metabolic information.
The Bigger Picture
Visceral fat is best understood not simply as “bad belly fat”, but as a warning light on the body’s nutrient-partitioning dashboard.
Healthy adipose tissue protects us by buffering incoming energy.
When that storage system becomes dysfunctional, lipids begin accumulating where they increasingly interfere with normal biology.
Visceral fat expands. Liver fat rises. Inflammatory signalling increases. Insulin resistance worsens. Triglyceride-rich lipoprotein production increases.
The metabolic flexibility discussed earlier in this series becomes progressively harder to maintain.
Visceral fat can therefore be both a marker of metabolic dysfunction and an active participant in its progression.
If you found this discussion useful, you may be interested in my recently published book, “Your Metabolic Shift”, which explores these concepts in greater depth.
Frequently Asked Questions (FAQ)
Is visceral fat mainly caused by carbohydrates?
No. Both excess carbohydrate and dietary fat can contribute. Carbohydrate can stimulate de novo lipogenesis and suppress fat oxidation; dietary fat can be stored more directly. Total energy surplus, diet quality and individual fat-storage biology all matter.
Is saturated fat worse for visceral fat?
Controlled overfeeding studies suggest excess saturated fat can promote more visceral and liver-fat accumulation than equivalent polyunsaturated fat despite similar weight gain.[7,8]
Is dairy fat equally harmful?
Current evidence does not justify treating all saturated-fat-containing foods identically. Dairy foods, particularly fermented products, exist within a complex food matrix and have not consistently been associated with increased visceral adiposity.[10,11]
Can exercise reduce visceral fat without major weight loss?
Yes. Exercise can reduce visceral fat and improve insulin sensitivity even when body-weight changes are modest.[23]
Can thin people have too much visceral fat?
Yes. BMI cannot determine internal fat distribution or metabolic health.
Do statins reduce visceral fat?
No. Statins primarily reduce LDL and ApoB-containing lipoproteins and cardiovascular risk; they are not a treatment for visceral adiposity.
What is the best way to measure visceral fat?
CT and MRI provide the most direct assessment. DXA offers a useful clinical estimate. BIA provides an indirect prediction and should not be interpreted as equivalent to imaging.
The Take-Home Message
The important question is no longer simply: How much fat do I have?
It is: Where is that fat, how is the tissue behaving, and what does it tell us about the body’s ability to manage energy?
Visceral fat is dynamic. Exercise, better diet quality, restoring energy balance, and meaningful fat loss can reduce it.
And that gives us perhaps the most useful mental picture of all.
The body needs somewhere safe to put tomorrow’s excess energy.
When healthy storage capacity begins to fail, fat stops being merely stored fuel.
It becomes part of the metabolic disease process.
This article is intended for educational purposes only and should not replace personalised medical advice. Readers with existing medical conditions should consult their healthcare professional before making significant dietary or lifestyle changes.
References
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- Lecoutre S, Rebière C, Maqdasy S, et al. Enhancing adipose tissue plasticity: progenitor cell roles in metabolic health. Nat Rev Endocrinol. 2025;21:272–288.
- Maeyens LT, Nelson JF, Zhao S. Visceral adiposity, metabolic health and aging. Nat Aging. 2026;6:506–519.
- Luo J, Wang Y, Mao J, et al. Features, functions, and associated diseases of visceral and ectopic fat: a comprehensive review. Obesity (Silver Spring). 2025;33:825–838. doi:10.1002/oby.24239.
- Minehira K, Bettschart V, Vidal H, et al. Effect of carbohydrate overfeeding on whole body and adipose tissue metabolism in humans. Obes Res. 2003;11:1096–1103.
- Acheson KJ, Schutz Y, Bessard T, et al. Glycogen storage capacity and de novo lipogenesis during massive carbohydrate overfeeding in man. Am J Clin Nutr. 1988;48:240–247.
- Rosqvist F, Iggman D, Kullberg J, et al. Overfeeding polyunsaturated and saturated fat causes distinct effects on liver and visceral fat accumulation in humans. Diabetes. 2014;63:2356–2368. doi:10.2337/db13-1622.
- Rosqvist F, Kullberg J, Ståhlman M, et al. Overeating saturated fat promotes fatty liver and ceramides compared with polyunsaturated fat: a randomised trial. J Clin Endocrinol Metab. 2019;104:6207–6219.
- Velloso LA, Schwartz MW. Altered hypothalamic function in diet-induced obesity. Int J Obes. 2011;35:1455–1465.
- Schmidt KA, Cromer G, Burhans MS, et al. The impact of diets rich in low-fat or full-fat dairy on glucose tolerance and its determinants: a randomised controlled trial. Am J Clin Nutr. 2021;113:534–547.
- Rouhani P, Mokhtari E, Soltani S, Saneei P. Consumption of dairy products and abdominal obesity in adults: a systematic review and dose-response meta-analysis of epidemiologic studies with GRADE assessment. Nutr Rev. 2026;84:1628–1647.
- Chait A, den Hartigh LJ. Adipose tissue distribution, inflammation and its metabolic consequences, including diabetes and cardiovascular disease. Front Cardiovasc Med. 2020;7:22.
- Chan DC, Barrett PHR, Watts GF. Dyslipidemia in visceral obesity: mechanisms, implications, and therapy. Am J Cardiovasc Drugs. 2004;4:227–246.
- Agrawal S, Wang M, Klarqvist MDR, et al. Inherited basis of visceral, abdominal subcutaneous and gluteofemoral fat depots. Nat Commun. 2022;13:3771.
- Goodpaster BH, He J, Watkins S, Kelley DE. Skeletal muscle lipid content and insulin resistance: evidence for a paradox in endurance-trained athletes. J Clin Endocrinol Metab. 2001;86:5755–5761.
- Klein S, Fontana L, Young VL, et al. Absence of an effect of liposuction on insulin action and risk factors for coronary heart disease. N Engl J Med. 2004;350:2549–2557. doi:10.1056/NEJMoa033179.
- Chaston TB, Dixon JB. Factors associated with percent change in visceral versus subcutaneous abdominal fat during weight loss: a systematic review. Int J Obes. 2008;32:619–628.
- Merlotti C, Ceriani V, Morabito A, Pontiroli AE. Subcutaneous fat loss is greater than visceral fat loss with diet and exercise, weight-loss promoting drugs and bariatric surgery: a critical review and meta-analysis. Int J Obes. 2017;41:672–682.
- Chan SL, Yu AM, Huang J, Vardhanabhuti V. Towards visceral fat estimation at population scale: correlation of visceral adipose tissue assessment using three-dimensional cross-sectional imaging with BIA, DXA, and single-slice CT. Br J Radiol. 2023;96.
- de Paula e Mancilha T, Bolan PJ, Dengel DR, et al. Visceral adipose tissue in obesity: a comparison between DXA and MRI measures. J Clin Densitom. 2026;29(2):101679. doi:10.1016/j.jocd.2026.101679.
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