Most body fat is visible, like waist fat. Yet, fat hidden deep in the abdomen can affect metabolism without obvious signs.

This is visceral fat. Even though you can't see it, it has a big effect on your long-term health. What makes it different, and why are its risks unique? Let’s look at how visceral fat is different and what dangers it can cause.

What is visceral fat?

Visceral fat wraps around organs like the liver, pancreas, and intestines deep inside your belly. Unlike the fat under your skin, you can’t pinch or see it easily. Still, it plays an active role in your health.

Amazingly, visceral fat behaves like an active endocrine gland, releasing signalling molecules called adipokines that influences inflammation, hormonal regulation, and metabolism. The resulting changes can have broad-reaching implications for blood sugar, blood fats, and appetite. This helps explain why people with the same body weight can have very different metabolic health under the surface.

Visceral fat vs. subcutaneous fat

Not all fat behaves the same way. Subcutaneous fat sits just under the skin, and it’s what we can pinch, see in the mirror, and run on the treadmill to try to burn off. However, despite getting the bulk of attention, subcutaneous fat is far less disruptive to metabolism. It can build up, but it doesn’t have the same risk profile as visceral fat.

Visceral fat sits deeper in the body, is more active, and affects the liver directly through the portal vein. The substances it releases can quickly upset your metabolism.

Central abdominal fat is associated with a higher risk of disease than fat elsewhere. Understanding why highlights the dangers of visceral fat.

Why visceral fat is dangerous

The health risks from visceral fat are real and backed by copious research. One of the strongest links is with insulin resistance, which occurs when the cells in your body don’t respond well to insulin signaling. When this happens, your body can’t manage blood sugar properly. Visceral fat sends fatty acids straight to the liver, which disrupts how your body uses sugar for energy and can lead to type 2 diabetes.

There is also a strong link between visceral fat and heart disease. Higher amounts of visceral fat can raise blood pressure and triglycerides while lowering HDL cholesterol (the 'good' cholesterol transport protein that helps remove cholesterol from your blood). It also increases inflammation. These factors contribute to atherosclerosis (buildup of fats and cholesterol in artery walls) over time. Inflammatory markers, like C-reactive protein, and cytokines such as IL-6 and TNF-alpha (proteins that signal inflammation), often rise in people with higher visceral fat.

Finally, visceral fat can contribute to the development of non-alcoholic fatty liver disease (NAFLD), a condition where fat builds up in the liver- even if a person never drinks alcohol. NAFLD is getting more and more common, and is closely tied to metabolic problems (issues with how the body processes food for energy). Over time, this buildup can lead to serious systemic problems if not managed.

Visceral fat is both harmful and active in the body. Now that you know the risks, it’s important to understand what causes it to build up.

What causes visceral fat buildup?

Visceral fat increases when calorie intake exceeds need, but other factors matter too.

Diet quality is of utmost importance- diets high in saturated fats and refined carbs (especially sweet drinks) as well as regular intake of ultra-processed foods are linked to increased accumulation of visceral fat. On the other hand, diets rich in whole foods, with enough protein and fibre, have been shown to reduce the storage of visceral fat.

Inactivity leads to more fat, especially around your belly. Moving every day, even just walking, can help lower this risk over time.

Chronic sleep deprivation disrupts hormones regulating appetite and metabolism. Prolonged stress increases cortisol, raising abdominal fat. Alcohol also increases central fat. Multiple behavioural and physiological factors are at play.

How to know if visceral fat is a problem for you

Since you can’t see visceral fat, doctors use scans like CT or MRI to measure it directly. These are the best ways to check, but they aren’t practical for everyday use.

Simple measurements can help with a basic estimate. Waist circumference is widely used and quick way to assess visceral fat. Generally, a waist circumference of 102 cm or more in men or 88 cm or more in women indicates an increased risk. Another useful metric is the waist-to-height ratio (waist circumference divided by height). A waist less than half your height is a tried-and-true rule of thumb.

But body weight doesn’t show everything. Some people look thin but still have a lot of visceral fat. This is called “thin outside, fat inside” (TOFI). That’s why tests for metabolic health are important, sometimes even more than how you look. So, if you find out you have too much visceral fat, how can you lower it?

How to reduce visceral fat

The good news is that visceral fat responds well to changes in your daily habits. You don’t need to make extreme changes, but you do need to be consistent. Try to lower your overall body fat, including visceral fat. Eating enough protein helps you feel full and keeps your muscles strong while losing weight. Fibre is also important, especially because it helps your gut and controls blood sugar. Cutting back on refined carbs, added sugars, and alcohol (a major contributor) can also go a long way to help reduce visceral fat and prevent its accumulation.

Exercise is important. Resistance training helps you maintain or build muscle and support your metabolism. Aerobic exercise, such as walking, running, or cycling, can reduce visceral fat. Walking more each day can make a real difference over time. Sleep and stress are often overlooked. Getting 7-9 hours of sleep each night helps keep your hormones balanced. Managing stress helps keep cortisol in check. These may not seem as obvious as diet and exercise, but they affect the same systems. The most effective approach is to consistently combine small, sustainable changes. Now that you know how to reduce visceral fat, let’s explore the typical timeline for seeing changes.

How long does it take to lose visceral fat?

One encouraging fact about visceral fat is that it often decreases faster than subcutaneous fat. Improvements in metabolic markers can happen before you notice visible changes in your body. While waiting for visible results, your health may already be improving inside. Keeping metabolic health in mind can help you appreciate the positive shifts you experience as you lose visceral fat.

The bottom line

Visceral fat is a serious hidden driver of metabolic problems and shouldn’t be taken lightly. However, it can be improved quickly with better habits.

Improve your nutrition, move more in ways you enjoy, work to optimize your sleep, and take stress management seriously. Each change will offer tangible benefits to reducing visceral fat and supporting overall health.

Visceral fat FAQs

What is visceral fat? Visceral fat is a type of fat stored deep in the abdomen around internal organs such as the liver and pancreas. It is different from fat found just under the skin.

Is visceral fat dangerous? Yes. It’s strongly associated with metabolic diseases including type 2 diabetes and cardiovascular disease.

Can you be skinny and have visceral fat? Yes. Some people carry higher levels of visceral fat even when their weight seems normal. This is sometimes called “thin outside, fat inside” (TOFI).

What’s the fastest way to lose visceral fat? A combination of eating a healthier diet, regular exercise, enough good sleep, and stress management methods tends to be the most effective way to lose visceral fat.