Why Normal-Weight People Get Gout: The Visceral Fat Your BMI Can’t See

Mike is 42, 5’10”, and 168 pounds. By every standard chart, his body mass index (BMI) is normal. His doctor calls him “fit.” So when he woke up at 3 a.m. with his big toe throbbing like someone had driven a nail through it, the diagnosis of gout made no sense to him. “I’m not overweight. I don’t drink beer every night. How is this possible?”

He is far from alone. Roughly one in four people with newly diagnosed gout in the U.S. have a normal BMI, according to data from the National Health and Nutrition Examination Survey. For years, doctors have shrugged and blamed genetics or seafood. But new imaging research presented at EULAR 2026, the annual congress of the European Alliance of Associations for Rheumatology, offers a more specific answer: where your body stores fat matters far more than how much you weigh.

The MRI Study That Changed the Picture

Lyn D. Ferguson and colleagues at the University of Manchester used magnetic resonance imaging (MRI) scans from the UK Biobank to compare body composition across three groups: 281 people with gout, 308 with rheumatoid arthritis, and metabolically healthy controls matched for age, sex, and BMI. The matching was critical. By lining up groups with identical BMI ranges, the researchers stripped away the obvious explanation and looked at what was different underneath.

The findings were striking. People with gout carried significantly more visceral fat, the deep abdominal fat that wraps around your liver, pancreas, and intestines. They also had more fat deposited inside the liver itself and more fat infiltrating their skeletal muscle. This pattern held even when their BMI was identical to healthy controls.

The second arm of the study was perhaps more important. The researchers looked at individuals who did not have gout at the time of their MRI scan and followed them forward. Those storing more fat viscerally, in the liver, and within muscle, while carrying less subcutaneous fat (the pinchable kind under the skin), were significantly more likely to develop gout later. This was not just a snapshot of existing disease; it was a predictor.

Ferguson presented the work as poster POS0803 at EULAR 2026 in London. “Effective weight management and helping people increase activity to aid muscle quality should be integral to management and prevention of gout,” the authors concluded.

Why Visceral Fat Is Different from Other Fat

Not all body fat behaves the same way, and this is where the BMI measure really falls apart.

Subcutaneous fat sits just beneath your skin. You can pinch it around your waist, thighs, and arms. It is relatively passive, storing energy and releasing it gradually. Visceral fat is a different beast. It sits deep in your abdominal cavity, surrounding your organs, and it is metabolically active in all the wrong ways. It pumps out free fatty acids directly into the portal vein, the blood vessel that feeds your liver. It secretes tumor necrosis factor-alpha and interleukin-6, pro-inflammatory cytokines that keep your body in a state of low-grade immune activation. It also reduces production of adiponectin, a hormone that normally helps insulin do its job and supports kidney clearance of uric acid.

Add it all up and visceral fat does two things that directly set the stage for gout: it drives insulin resistance, which causes your kidneys to hold on to uric acid instead of flushing it out, and it raises overall inflammation, which makes your immune system more reactive when urate crystals do form in a joint.

Liver fat compounds the problem. When your liver is packed with fat, a condition called hepatic steatosis, it produces more uric acid through accelerated purine metabolism. At the same time, the inflamed liver becomes less efficient at clearing it. It is a double hit on your serum urate level, and it can happen in people who look perfectly normal in a mirror.

There is even a clinical acronym for this body type: TOFI, thin outside, fat inside. A person can be lean by BMI while carrying the metabolic profile of someone with obesity.

The Kidney Connection: How Insulin Traps Uric Acid

To understand why a normal-weight person develops gout, you have to follow the biology into the kidneys.

When you are insulin resistant, your pancreas compensates by pumping out more insulin. That chronic high-insulin state acts directly on the proximal tubules of your kidneys. It stimulates the URAT1 transporter and the GLUT9 transporter, both of which pull uric acid back into the bloodstream instead of letting it pass into urine. The result is renal urate retention: your kidneys become stingy about excreting the uric acid your body produces every day.

Roughly 90% of people with elevated uric acid are underexcreters rather than overproducers. The problem is not usually that they make too much uric acid. It is that their kidneys do not clear enough of it. And insulin resistance, often driven by visceral fat even in lean people, is one of the most common reasons for that clearance deficit.

This explains the frustrating pattern many people describe: they cut out organ meats, they stop drinking beer, they eat cherries by the bag, and their uric acid barely moves. Because dietary purines are only one piece of the puzzle. If insulin resistance is keeping their kidneys in urate-retention mode, trimming high-purine foods alone will not fix the number.

What You Can Actually Measure

BMI will not tell you if you are TOFI. A standard scale will not either. But two simple office-based measurements get you much closer.

Waist circumference. Measure around your belly at the level of your navel, not at the narrowest point. For men, a waist above 40 inches (102 cm) signals elevated visceral fat risk. For women, the threshold is 35 inches (88 cm). These are not perfect, and some ethnic groups, including South Asian and East Asian populations, should use lower cutoffs of 35 inches for men and 31 inches for women. But a tape measure beats BMI for spotting abdominal fat.

Waist-to-height ratio. Divide your waist circumference by your height, both in the same units. A ratio above 0.5 is linked to higher cardiometabolic and gout risk regardless of BMI. If you are 5’10” (70 inches) and your waist is 37 inches, your ratio is 0.53, which is above the threshold even though your BMI may read normal.

The gold standard for measuring visceral fat is an MRI or CT scan, but those are expensive and unnecessary for most people. Newer DEXA body composition scans, available at many gyms and clinics for $50 to $100, can estimate visceral fat volume. Some smart scales that use bioelectrical impedance give a rough visceral fat rating, though their accuracy varies widely.

What about blood work? Fasting insulin, triglycerides, and the triglyceride-to-HDL ratio can hint at insulin resistance. A triglyceride-to-HDL ratio above 3.0 (using mg/dL units) is a rough marker of insulin resistance in many populations. If your uric acid is elevated and your ratio is high, the metabolic connection is worth discussing with your doctor.

Moving from Risk to Action

The good news about visceral fat is that it is biologically active and responsive to change. It tends to shrink faster than subcutaneous fat when you create a sustained energy deficit. You do not need to reach a dramatic weight target to see a meaningful difference in uric acid and inflammation.

Losing just 5 to 10 percent of your body weight can improve insulin sensitivity enough to lower serum uric acid, according to multiple weight-loss intervention studies. For a 168-pound person, that is 8 to 17 pounds. Even modest, sustained weight reduction reduces visceral fat volume, lowers inflammatory markers, and improves renal urate clearance.

But how you lose weight matters. Crash dieting and rapid weight loss trigger ketosis, and ketone bodies compete with uric acid for excretion in the kidneys, which can paradoxically raise serum urate and trigger a gout flare. This is why people sometimes report an attack after starting a strict ketogenic diet. Slow, steady weight loss of one to two pounds per week is safer for people with gout.

Exercise is arguably more important than the scale number. The EULAR study specifically highlighted muscle quality as part of the problem. Fat infiltration into muscle, sometimes called “creeping fat,” reduces the muscle’s ability to take up glucose from the bloodstream, worsening insulin resistance. Resistance training two to three times per week builds or preserves muscle mass, and skeletal muscle is one of the largest sites for glucose disposal in the body. Aerobic exercise, even brisk walking for 30 minutes most days, reduces visceral fat specifically, including in people who do not lose weight.

A 10-minute walk after meals deserves special mention. It blunts the post-meal glucose and insulin spike, reducing the repeated insulin surges that tell your kidneys to hold on to uric acid. It is a small habit with outsized metabolic returns.

Sleep and stress belong in the conversation too. Sleep deprivation raises insulin resistance within days. Chronic stress elevates cortisol, which promotes visceral fat accumulation specifically, a pattern researchers have documented in both animal models and human studies. If you are burning the candle at both ends while trying to manage uric acid through diet alone, you are fighting uphill.

Diet: Beyond the Purine List

Standard gout advice tells you to avoid organ meats, certain seafood, and beer. That is still sound. But the visceral fat and insulin resistance angle shifts the emphasis toward foods that drive metabolic dysfunction.

Sugar-sweetened beverages are the single biggest dietary lever for many people. Fructose, whether from high-fructose corn syrup in soda or from large quantities of fruit juice, raises uric acid production directly through ATP degradation in the liver and worsens insulin resistance over time. Cutting sugary drinks is often more impactful than eliminating the occasional serving of shrimp, which we covered in our piece on the uric acid and obesity connection.

Ultra-processed foods, high in refined carbohydrates and industrial seed oils, promote visceral fat accumulation and systemic inflammation. A Mediterranean or DASH-style eating pattern, rich in vegetables, whole grains, legumes, fish, and olive oil, has been associated with lower uric acid levels and reduced gout flare frequency in observational studies.

Protein does not need to be the enemy. The myth that all protein raises uric acid has been thoroughly debunked in plant-based populations. Eggs, dairy, and most plant proteins have minimal impact on uric acid. The bigger dietary culprits for TOFI-pattern gout are fructose, refined carbohydrates, and excess alcohol, not lentils or Greek yogurt.

What This Means for Treatment

Lifestyle changes matter, but they are not a replacement for medication when urate-lowering therapy is indicated. If you have recurrent flares, tophi, or very high serum urate, your doctor may prescribe allopurinol or febuxostat regardless of your weight. The goal is to bring serum urate below 6 mg/dL (below 5 mg/dL if you have tophi or severe disease) and keep it there, as we explain in our guide to managing gout day to day.

What the body composition research adds is a second track: addressing the metabolic environment that may be driving your uric acid retention in the first place. A person with TOFI-pattern gout who only takes allopurinol without addressing visceral fat and insulin resistance may need ever-higher doses to hit target, and they remain at elevated risk for type 2 diabetes and cardiovascular disease. The two approaches work together, not against each other.

This is also worth discussing with your doctor if you are on medications that worsen insulin resistance or raise uric acid, such as certain diuretics or beta-blockers. Sometimes a blood pressure medication switch can make a meaningful difference in urate levels.

The Bottom Line for Mike and Everyone Like Him

Mike started measuring his waist instead of trusting his BMI. At 38 inches, his waist-to-height ratio was 0.54. His fasting insulin came back elevated. His doctor ordered a DEXA scan that showed visceral fat in the 75th percentile for his age despite his normal weight. Six months of resistance training, post-meal walks, cutting soda, and improving sleep dropped his waist to 34 inches and his uric acid from 8.2 to 6.6. He still takes allopurinol, but at a lower dose, and he has not had a flare in over a year. That combination of medication adherence and metabolic improvement is exactly what the research on gout outcomes keeps pointing toward.

If you are a normal-weight person with gout, or if your uric acid stays high no matter how carefully you eat, stop blaming yourself for cheating on a diet you did not actually cheat on. Ask your doctor to check your waist circumference, your fasting insulin, and your triglyceride-to-HDL ratio. The problem may not be what you are eating. It may be where your body is storing fat, and that is something you can actually change.

Frequently Asked Questions

Can you get gout if you are not overweight?

Yes. About 25% of newly diagnosed gout cases occur in people with a normal BMI. The EULAR 2026 UK Biobank MRI study found that people with gout carry more visceral fat, liver fat, and muscle fat even when matched for BMI with healthy controls. This “thin outside, fat inside” pattern, called TOFI, can drive insulin resistance and uric acid retention without showing up on a standard BMI chart.

How do I know if I have too much visceral fat?

Start with a tape measure. A waist circumference above 40 inches for men or 35 inches for women (lower thresholds for Asian populations) suggests elevated visceral fat. A waist-to-height ratio above 0.5 is another warning sign. DEXA scans and MRI can measure visceral fat more precisely. Blood markers like high fasting insulin, high triglycerides, and a triglyceride-to-HDL ratio above 3.0 can indicate insulin resistance, which often accompanies visceral fat accumulation.

Does losing weight help lower uric acid?

Losing 5 to 10% of body weight through gradual calorie reduction and exercise improves insulin sensitivity, reduces visceral fat, and can lower serum uric acid. However, rapid weight loss and crash dieting can trigger ketosis, which competes with uric acid excretion and may cause a gout flare. Aim for slow, steady weight loss of one to two pounds per week, and stay hydrated throughout.

What type of exercise is best for reducing gout risk?

Both aerobic exercise and resistance training help. Brisk walking for 30 minutes most days reduces visceral fat and improves insulin sensitivity. Resistance training two to three times per week improves muscle quality and glucose uptake, which is important because fat infiltration into muscle worsens insulin resistance. A 10-minute walk after meals is a simple, evidence-based way to blunt post-meal insulin spikes that drive kidney urate retention.

Do I still need gout medication if I fix my body composition?

Improving body composition and insulin sensitivity can lower uric acid and reduce flare frequency, but it does not replace urate-lowering therapy when it is medically indicated. If you have recurrent flares, tophi, kidney stones, or serum urate consistently above 6 mg/dL, medication such as allopurinol may still be necessary. Lifestyle changes and medication work best together, and do not stop prescribed treatment without talking to your doctor.

Why does my uric acid stay high even though I barely eat high-purine foods?

About 90% of people with high uric acid are underexcreters, meaning their kidneys do not clear uric acid efficiently rather than overproducing it. Insulin resistance, often driven by visceral fat, stimulates kidney transporters (URAT1 and GLUT9) that pull uric acid back into the bloodstream. Fructose from sugary drinks and ultra-processed carbohydrates can also raise uric acid production independently of purine intake. Fixing metabolic health may move the needle more than further restricting dietary purines.

Reviewed by the GoutSavvy Editorial Team