If you've been trying to lose weight, you've probably heard the term "visceral fat" thrown around — maybe from your doctor, maybe from a wellness influencer, maybe from the news. It's often used interchangeably with "belly fat", but that's not quite right, and the difference actually matters a lot for your health.
You may have also seen recent headlines about Calocurb, a plant-based supplement that showed meaningful weight loss results in a clinical trial. What didn't make as many headlines is this: the same study found that Calocurb produced a substantial reduction in visceral fat specifically — the type of fat doctors care about most.1 We'll get into exactly what that means below, but first, let's break down what visceral fat actually is.
What Is Visceral Fat, and How Is It Different From Subcutaneous (Belly) Fat?
Your body stores fat in two main places. The fat you can pinch just under your skin — on your belly, arms, or thighs — is called subcutaneous fat. It's the fat most of us think of when we picture "body fat," and while too much of it isn't ideal, it's relatively low-risk compared to its counterpart.
The other type, visceral fat (sometimes called VAT, short for visceral adipose tissue), is stored much deeper — wrapped around your internal organs like your liver, intestines, and pancreas.2 You can't see it or pinch it, and even people who look slim can carry a surprising amount of it. Visceral fat isn't just inert padding, either: it behaves almost like an organ itself, producing hundreds of different hormones and chemical messengers ("adipokines") that influence inflammation, blood sugar, and metabolism throughout your body.3
So is visceral fat the same as belly fat? Not exactly. "Belly fat" is really a mix of both types layered on top of each other — subcutaneous fat sitting above the deeper visceral fat around your organs. When people say they want to lose belly fat, what actually moves the needle on their health the most is the visceral portion underneath, not just the layer you can pinch.
How Does Visceral Fat Affect Your Health?
This is the part that makes visceral fat worth paying attention to. Visceral fat behaves differently from subcutaneous fat. Its fat cells are bigger and produce inflammatory adipokines.4 Visceral fat cells are more metabolically active, but less sensitive to insulin's role in preserving them, so they break down more readily, releasing their fatty contents, which then travel to other organs such as the liver and muscles.56 It's not surprising that excess visceral fat is linked to a wide range of health problems, and research suggests it's often a better predictor of disease risk than body weight or BMI alone.789 Conditions associated with high visceral fat levels include:10
- Type 2 diabetes and insulin resistance
- Metabolic syndrome and fatty liver disease
- Polycystic ovarian syndrome (PCOS)
- Heart disease, hardening of the arteries, atrial fibrillation, and heart failure
- Stroke, including greater risk at a younger age
- Kidney disease, including diabetes-related kidney damage
Figure 1: Visceral fat and its body-wide health consequences.11
Figure 1: Visceral fat and its body-wide health consequences.11
Even aging itself seems to make things worse: as we get older, hormonal shifts and low-grade inflammation make it easier to accumulate visceral fat, and higher visceral fat levels have in turn been linked to faster biological aging.12
How Do Doctors Measure It?
Your bathroom scale and even BMI can't tell you how much visceral fat you're carrying — they don't distinguish fat from muscle or show where fat is stored.13 The most accurate ways to measure visceral fat are MRI, CT scans, or specialized DEXA scans, though these aren't part of routine checkups. More accessible (if less precise) estimates come from waist circumference, waist-to-hip ratio, or the bioelectrical impedance "smart scales" some clinics and gyms use. Researchers are starting to use something called the Visceral Adipose Index (VAI) that combines BMI, waist circumference, and high-density lipoprotein (HDL) cholesterol and triglyceride levels.14 VAI scores have been shown to correlate with the conditions listed above in multiple studies and meta-analyses.15
Where Visceral Fat Builds Up — and What It Does
Visceral fat doesn't just sit in one place; it can build up around several different organs, and each location tends to cause its own set of problems:16
| Where It Builds Up | What It Can Do | Health Conditions It's Linked To |
|---|---|---|
| Around the gut and intestines | Disrupts gut function and triggers inflammation | Inflammatory bowel disease, diabetes, heart disease, sleep apnea |
| Around the kidneys | Affects kidney filtering and blood flow; can compress nearby vessels | Kidney disease, diabetic kidney damage, heart disease |
| Around and within the pancreas | Disrupts hormones that control blood sugar | Type 2 diabetes, fatty pancreas disease |
| Inside the liver | Drives insulin resistance and body-wide inflammation | Fatty liver disease, hardening of the arteries |
| Around the heart | Promotes scarring and impairs blood vessel function | Heart disease and related conditions |
| Within and around muscle | Interferes with how muscle responds to insulin | Age-related muscle loss, type 2 diabetes, multiple sclerosis |
How Can You Reduce Visceral Fat?
Because visceral fat is so strongly tied to health outcomes, reducing it — not just losing weight in general — is often the real goal. Historically, that's come down to a few main approaches.
Lifestyle Changes
Calorie-controlled eating, Mediterranean-style diets, and intermittent fasting have all been shown to reduce waist size and improve body composition.17 Exercise matters too: moderate-to-high intensity aerobic exercise (like brisk walking, cycling, or jogging) is particularly effective at reducing visceral fat, with strength training offering some benefit as well.18 The catch is that lifestyle changes don't specifically target visceral fat, and they can be genuinely hard to stick with long-term.
Surgery
For some people with more significant obesity, bariatric surgery can produce a bigger drop in visceral fat than lifestyle or medication alone, along with major health improvements like diabetes remission.19 A procedure called Roux-en-Y gastric bypass has been shown to produce around twice as much reduction in visceral fat compared to gastric banding.20 It's an effective option, but it's also a major medical procedure with its own risks and isn't the right choice for everyone.
GLP-1 Medications
You've likely heard of GLP-1 receptor agonists — medications like semaglutide (Wegovy®/Ozempic®) or tirzepatide (Zepbound®/Mounjaro®) — which have become well known for weight loss. Research shows they also reduce both visceral and subcutaneous fat and improve related health markers. However, a large proportion of people stop taking them over time, often due to side effects, high cost, insurance coverage issues, or discomfort with injections.
Calocurb: A Natural Option That Targets Visceral Fat
This is where Calocurb comes in. Its active ingredient, Amarasate®, is a natural extract made from hop flowers (yes, the same plant used in beer) — but the mechanism is what makes it interesting. Amarasate works upstream of GLP-1 medications, using your body's own biology instead of injecting a synthetic hormone.
When you take it before a meal, Amarasate stimulates bitter-taste receptors found on cells lining your gut. In response, those cells release three natural hormones that signal fullness to your brain: GLP-1 (the same hormone targeted by drugs like Ozempic), cholecystokinin (CCK), and peptide tyrosine tyrosine (PYY).21 In an earlier clinical study, this boosted GLP-1 by over 6 times, CCK by 6 times, and PYY by nearly double, which led to an 18% drop in how much food people ate at their next meal.22
Natural GLP-1 Support
Target the fat that matters most
Calocurb's clinically studied Amarasate activates your body's own fullness hormones — GLP-1, CCK, and PYY — to support fat loss, including visceral fat, naturally.
What the Recent Clinical Trial With Calocurb Actually Found
A 24-week clinical trial compared Amarasate (the active ingredient in Calocurb) to a placebo in adults with overweight or obesity. Everyone in the study also received general diet and exercise advice in group sessions at their weigh-ins, and their weight and body composition were carefully measured every four weeks.
The people taking Amarasate lost 4.3% of their body weight — significantly more than the placebo group — while holding onto their muscle mass.23 In fact, their total fat loss was even greater than their total weight loss, meaning the weight they lost was almost entirely fat, not muscle.
The visceral fat loss in the Amarasate group was more than three and a half times greater than in the placebo group.24 This was a statistically significant difference (meaning it wasn't just due to chance) compared to the placebo group and also to the starting value in the Amarasate group.25 The placebo group's visceral fat loss actually stalled and started reversing around week 12. The Amarasate group's visceral fat, by contrast, kept dropping steadily all the way through the full 24 weeks. Figure 2 shows this continued visceral fat loss in the Amarasate group, compared to that of the placebo group.
Figure 2: Reduction in visceral fat area, Amarasate vs. placebo in overweight and obese people over 24 weeks.26
In practical terms, that makes Calocurb a genuine option for people looking to reduce the type of fat that matters most for long-term health — not just the number on the scale. It can be used on its own alongside diet and exercise, as an alternative for people who can't or don't want to use GLP-1 medications, as a step-down option for people finishing a course of GLP-1 treatment, or even alongside a GLP-1 medication to help maintain results on a lower dose.
The Bottom Line
Visceral fat plays an outsized role in your long-term health — often more than your weight alone. The good news is that it responds to a combination of strategies: eating well, staying active, and, for the right candidates, medical options like GLP-1 medications or bariatric surgery. Calocurb adds a new, natural option to that toolkit, with recent clinical trial data showing it doesn't just help you lose weight — it specifically targets the visceral fat that drives so many of the health risks tied to carrying extra weight.
