Abdominal Fat and Insulin Resistance: Understanding the Connection

Name: About Abdominal Fat and Insulin Resistance: The Link
Creator: Withings

Abdominal fat and insulin resistance fuel each other. High insulin levels drive the body to store fat deep in the abdomen; in turn, this visceral fat secretes inflammatory signals that worsen cellular insulin resistance, locking the body into a self-reinforcing metabolic loop.

The good news is that the loop works both ways. Understanding the connection is the first step, and tracking your visceral fat over time offers a clear look into your changing body composition, precisely what we designed the BodyScan 2 smart scale to do.

What is insulin resistance?

Insulin resistance is when cells in your muscles, fat, and liver stop responding properly to insulin, the hormone that moves glucose out of your blood and into your cells. Your pancreas compensates by making more insulin (Cleveland Clinic).

Think of insulin as a key and your cells as locks. In an insulin-sensitive body, a single turn of the key opens the door, allowing glucose to move in. When cells become insulin-resistant, the lock sticks. The key still works, but it takes far more effort, forcing the pancreas to produce more and more insulin just to get the job done.

For a while, this compensation works, and blood sugar stays in the normal range. Insulin itself is already elevated, and that matters because insulin is also the body's main fat-storage signal. Over time, if the pancreas can no longer keep up, blood glucose starts to rise, which is the path toward prediabetes and type 2 diabetes (Cleveland Clinic).

Insulin sensitivity is the opposite end of the same scale: how efficiently your cells respond to insulin. Higher insulin sensitivity means your cells need less insulin to keep blood glucose levels stable. This is also why insulin resistance is easy to miss. In its early stages, it often produces no symptoms at all.

What is visceral (abdominal) fat?

Visceral fat is the adipose tissue stored deep inside the abdomen, wrapped around the liver, pancreas, and intestines. Unlike subcutaneous fat, which sits just under the skin, it is metabolically active and releases signalling molecules directly into the bloodstream.

Two people can weigh the same, wear the same size, and have very different amounts of visceral fat. This is why location matters more than total weight. A 1996 study in Diabetes measured abdominal fat directly by DEXA scan and insulin sensitivity by euglycemic clamp in 22 women: central abdominal fat alone explained 79% of the variation in whole-body insulin sensitivity, far more than peripheral fat (Carey et al., 1996). The relationship held even in women with a BMI below 25. This is now the mainstream clinical position: a 2025 Lancet Diabetes & Endocrinology Commission on clinical obesity, endorsed by more than 75 medical organisations, states that BMI is not a direct measure of body fat and does not reflect how that fat is distributed, and recommends pairing it with a measure of fat distribution such as waist circumference.

Visceral fat also sits in a particular place in the body's plumbing. Blood draining from visceral fat carries its metabolic output—mainly free fatty acids and inflammatory signals—straight into the portal vein to the liver, before it is diluted in general circulation. Subcutaneous fat drains into systemic circulation instead.

For a fuller explanation of what visceral fat is and how it is measured, see our guide to visceral fat.

Because visceral fat is invisible on a standard bathroom scale and hard to judge in the mirror, tracking it is essential. Body Scan 2 estimates visceral fat as part of its 6-zone body composition analysis, allowing you to follow real trends instead of guessing.

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How are abdominal fat and insulin resistance connected?

They reinforce each other. High insulin promotes fat storage in the abdomen; enlarged visceral fat cells release inflammatory cytokines and free fatty acids; those signals make muscle and liver cells less responsive to insulin, so the body produces even more insulin.

Researchers describe this as a vicious cycle rather than a one-way street, and each turn of the loop makes the next turn easier. Here is what happens at each step.

Insulin rises. Cells respond less well, so the pancreas secretes more insulin to move the same glucose. Insulin is also the body's main fat-storage signal, so more of it means more storage.
Fat is stored abdominally. Excess energy is directed into adipose tissue, including the visceral layers around the organs. Location matters here: visceral fat drains into the portal vein, delivering its output straight to the liver.
Fat cells enlarge. Existing adipocytes swell rather than multiply, and become stressed. Enlarged, stressed fat cells behave differently from healthy ones.
Inflammatory signalling starts. Stressed adipose tissue attracts immune cells and releases adipokines and inflammatory cytokines. These molecules interfere with insulin signalling in muscle and liver cells.
Lipolysis increases. Insulin normally restrains fat breakdown, but resistant fat cells release more free fatty acids. Those fatty acids accumulate in the liver and muscle, where they further blunt insulin action.
Insulin sensitivity falls. Cells now respond even less well than in step 1. The loop closes and restarts, one notch further along.

The role of fat distribution, rather than fat quantity alone, is a central theme of this research. A review in Endocrine Reviews examining different tissue and cellular lipid depots in humans concluded that where lipid is stored, and how much of it spills into the liver and muscle, is what best explains differences in insulin sensitivity between people (Hocking et al., 2013). A broader review of the mechanisms behind obesity-related insulin resistance reaches a similar conclusion about the role of adipose tissue inflammation (Hardy et al., 2012).

The liver is not a passive bystander. Researchers at Columbia University Irving Medical Center found that the liver releases an enzyme, DPP4, that travels through the bloodstream to abdominal fat and helps activate inflammatory cells there, worsening insulin resistance (Columbia University Irving Medical Center, published in Nature, 2018). In other words, the conversation between belly fat and the liver runs in both directions.

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What are the signs and risks?

Early insulin resistance often has no symptoms. When signs do appear, they tend to be non-specific: weight that settles around the middle, energy dips after meals, and skin changes such as darkened patches or skin tags (Cleveland Clinic).

Signs people notice:

Weight that concentrates around the waist

Because insulin drives abdominal storage, a waistline that grows while overall weight is stable is worth paying attention to.

Energy dips after meals

A heavy, sleepy feeling an hour or two after eating, particularly after a carbohydrate-rich meal.

Hunger and sugar cravings

that return quickly even after a full meal.

Skin changes

Acanthosis nigricans, velvety dark patches in the folds of the neck, armpits, or groin, and skin tags are both recognised signs associated with insulin resistance and prediabetes (Cleveland Clinic).

None of these is diagnostic on its own. Only a healthcare professional can assess insulin resistance, typically through blood tests such as fasting glucose or HbA1c.

Factors that increase the risk

Cleveland Clinic lists excess body fat (particularly around the abdomen), physical inactivity, being 45 or older, a family history of diabetes, a history of gestational diabetes, and certain ethnic backgrounds among the main risk factors for insulin resistance.

Why it matters over time

Left unaddressed, sustained insulin resistance is associated with a higher risk of prediabetes and type 2 diabetes, as the pancreas gradually loses the ability to compensate. It is also associated with cardiovascular risk factors including high blood pressure and abnormal blood lipids, which is why it is often discussed alongside metabolic syndrome (Cleveland Clinic).

The reassuring part: insulin sensitivity is responsive. It is one of the metabolic markers that tends to respond quickest to changes in daily habits.

How to improve insulin sensitivity

The evidence points consistently to five levers: building muscle, moving after meals, eating more fibre, protecting sleep, and reducing visceral fat specifically. They work together, and several show measurable effects within weeks, not months.

1. Build and keep muscle

Skeletal muscle is where most meal glucose ends up. More muscle means more storage capacity, and resistance training improves how well muscle takes up glucose independently of any weight loss. Two or three sessions a week is the usual starting point, and it does not require a gym.

2. Walk after meals

This is the highest-return, lowest-effort item on the list. A systematic review with meta-analysis in Sports Medicine found that light walking after a meal produced a meaningful improvement in the post-meal glucose response, and that even short bouts of a few minutes were enough to shift it (Buffey et al., 2022). Timing matters more than duration: a two- to five-minute walk shortly after eating beats a longer walk hours later.

3. Eat more fibre, and change the order

Fibre slows the rate at which glucose enters the bloodstream, which flattens the insulin response. Vegetables, pulses, whole grains and nuts all contribute. Eating vegetables and protein before the starch in a meal is a simple, no-restriction version of the same idea.

4. Protect your sleep

Sleep is not a soft factor here. In a randomised crossover study published in the Annals of Internal Medicine, four nights of sleep restriction measurably impaired insulin signalling in human fat cells in healthy young adults (Broussard et al., 2012). Consistent sleep timing and duration is one of the few levers that works while you do nothing at all.

To finish, always try to target visceral fat, not just your weight.

Because visceral fat is so closely linked to insulin sensitivity, it is far more informative than scale weight alone. It also responds earlier to diet and exercise, which means meaningful progress can happen internally even when the scale doesn't budge. That trend is worth following over months rather than days: BodyScan 2 tracks your visceral fat estimate over time alongside the rest of your body composition so that you can see the direction of travel.

A note on medication. If you are taking a GLP-1 medication or considering one, body composition tracking is particularly relevant, since preserving muscle while losing fat is one of the main challenges. See our guide to body composition and weight goals.

Track your metabolic health with Withings

BodyScan 2 estimates your visceral fat as part of a 6-zone body composition analysis, and combines it with a Nerve Response Score to produce your Glucose Resilience score, a long-term wellness indicator available with Withings+.

Insulin resistance itself can only be assessed by a healthcare professional. At home, the best approach is to track measurable metrics consistently over time.

Visceral fat

BodyScan 2 estimates the visceral fat depot specifically, not just total body fat, as part of its 6-zone body composition analysis. Because it measures the same way each time, the trend over weeks and months is what makes it useful.

The Glucose Resilience score

Available with Withings+, this score brings together two things BodyScan 2 measures: your visceral fat and your Nerve Response Score, derived from a sudomotor measurement. It is presented on a four-level scale, from Altered through Moderate and Balanced to Optimal, and is designed to be read as a long-term trend rather than a daily number.

The Glucose Resilience score is a long-term wellness indicator, not a medical diagnosis. It does not detect or diagnose any disease. It does not measure blood glucose, HbA1c, or insulin resistance.

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Does belly fat cause insulin resistance?

They influence each other rather than one simply causing the other. Visceral fat releases inflammatory signals associated with reduced insulin sensitivity, while high insulin promotes abdominal fat storage, which is why researchers describe it as a loop.

Can you reverse insulin resistance by losing abdominal fat?

Research consistently connects reductions in visceral fat to improved insulin sensitivity. However, individual outcomes vary, and any medical or treatment decisions should be made in consultation with a healthcare professional.

What are the early signs of insulin resistance?

Often none. When signs appear, they may include weight concentrating around the waist, energy dips after meals, persistent sugar cravings, and skin changes such as darkened patches or skin tags (Cleveland Clinic).

Is visceral fat worse than subcutaneous fat for blood sugar?

Visceral fat is more strongly associated with reduced insulin sensitivity. It is metabolically active and drains directly to the liver, whereas subcutaneous fat is less strongly linked (Carey et al., 1996).

How is insulin resistance different from diabetes?

Insulin resistance means cells respond poorly to insulin while blood glucose may still be normal, because the pancreas compensates. Type 2 diabetes is diagnosed when that compensation fails, and blood glucose stays elevated.

What is the fastest way to improve insulin sensitivity?

Short walks after meals show effects quickly, alongside resistance training, more dietary fiber, and consistent sleep. Research indicates even a few minutes of light walking after eating improves the post-meal glucose response (Buffey et al., 2022).

Does BodyScan 2 measure insulin resistance?

No. BodyScan 2 estimates visceral fat and provides a Glucose Resilience wellness score. It does not measure blood glucose, HbA1c, or insulin resistance, and it does not detect or diagnose any disease.

Sources used on this page

Cleveland Clinic. Insulin Resistance. my.clevelandclinic.org/health/diseases/22206-insulin-resistance
Carey DG, Jenkins AB, Campbell LV, Freund J, Chisholm DJ. Abdominal Fat and Insulin Resistance in Normal and Overweight Women: Direct Measurements Reveal a Strong Relationship in Subjects at Both Low and High Risk of NIDDM. Diabetes, 1996;45(5):633-638. diabetesjournals.org
Hardy OT, Czech MP, Corvera S. What causes the insulin resistance underlying obesity? Current Opinion in Endocrinology, Diabetes and Obesity, 2012;19(2):81-87. pubmed.ncbi.nlm.nih.gov/22327367/
Hocking S, Samocha-Bonet D, Milner KL, Greenfield JR, Chisholm DJ. Adiposity and Insulin Resistance in Humans: The Role of the Different Tissue and Cellular Lipid Depots. Endocrine Reviews, 2013;34(4):463-500. academic.oup.com/edrv/article/34/4/463
Columbia University Irving Medical Center. Belly Fat Promotes Diabetes Under Orders From Liver (Ghorpade et al., Nature, 2018). cuimc.columbia.edu/news/belly-fat-promotes-diabetes-under-orders-liver
Buffey AJ, Herring MP, Langley CK, Donnelly AE, Carson BP. Sports Medicine, 2022. link.springer.com/article/10.1007/s40279-022-01808-7
Broussard JL, Ehrmann DA, Van Cauter E, Tasali E, Brady MJ. Impaired Insulin Signaling in Human Adipocytes After Experimental Sleep Restriction: A Randomized, Crossover Study. Annals of Internal Medicine, 2012;157(8):549-557. doi.org/10.7326/0003-4819-157-8-201210160-00005
The Lancet Diabetes & Endocrinology Commission Definition and diagnostic criteria of clinical obesity sciencedirect.com/science/article/pii/S2213858724003164?via%3Dihub