Belly fat has two medical names because it comes in two distinct types. The fat you can pinch sits just beneath your skin and is called subcutaneous fat. The fat packed deeper inside your abdomen, wrapped around your organs, is called visceral fat. Both contribute to your waistline, but they behave very differently inside your body.
Subcutaneous Fat: The Layer You Can Feel
Subcutaneous fat is the soft, pinchable layer between your skin and your abdominal wall. The word “subcutaneous” literally means “under the skin,” and this type of fat exists all over your body, not just your belly. On the abdomen, it tends to feel squishy and shifts when you move.
This layer serves real biological purposes. It insulates your body, cushions it against impact, and stores energy. In moderate amounts, subcutaneous fat is relatively harmless. It can be stubborn to lose, but it doesn’t carry nearly the same metabolic risks as its deeper counterpart.
Visceral Fat: The Hidden, Riskier Type
Visceral fat lives deep in your belly, surrounding your liver, intestines, and other organs. You can’t pinch it or see it directly. A person with a firm, protruding belly that doesn’t feel soft to the touch likely has a significant amount of visceral fat pushing outward against the abdominal wall, rather than a thick layer of subcutaneous fat sitting on top.
What makes visceral fat particularly concerning is that it doesn’t just sit there. Fat tissue throughout your body functions as an active organ in your endocrine system, secreting hormones and communicating with your brain and other organs to regulate metabolism, hunger, and energy storage. Visceral fat takes this a step further. When it accumulates in excess, it becomes dysfunctional, pumping out inflammatory signals while reducing production of protective hormones. This creates a pro-inflammatory environment throughout the body.
That chronic inflammation is what links visceral fat to serious health conditions. Excess visceral fat promotes insulin resistance, where your cells stop responding properly to insulin and blood sugar stays elevated. Insulin resistance is a core feature of metabolic syndrome, a cluster of cardiovascular risk factors that often travel together: high blood pressure, high blood sugar, abnormal cholesterol, and a large waist circumference. Over time, these conditions raise the risk of type 2 diabetes and cardiovascular disease.
Why Fat Accumulates Deep in the Abdomen
Several factors determine whether your body stores fat subcutaneously or viscerally, and hormones play a central role. Cortisol, the body’s primary stress hormone, has a strong association with trunk fat accumulation. Persistently elevated cortisol levels have antilipolytic effects, meaning they slow the breakdown of fat in the abdominal area, encouraging it to stay put and grow. Research published in the American Journal of Physiology found that higher cortisol levels in overweight adolescents contributed to increased trunk fat and unfavorable lipid profiles. Growth hormone deficiency produces a similar pattern, and restoring growth hormone in deficient individuals can reverse trunk fat accumulation due to its fat-breaking effects.
Beyond hormones, the usual suspects matter too. Diets high in refined carbohydrates and sugar drive insulin spikes that favor fat storage. Sedentary behavior, poor sleep, and alcohol consumption all tend to increase visceral fat specifically. Genetics also influence where your body prefers to deposit fat, which is why some people carry weight in their midsection while others store it in their hips and thighs.
How to Tell How Much Visceral Fat You Have
The simplest screening tool is a tape measure. The World Health Organization considers a waist circumference above 88 cm (about 35 inches) for women and above 102 cm (about 40 inches) for men to be a high-risk threshold. You measure at the level of your navel, standing up, breathing normally. This doesn’t distinguish between subcutaneous and visceral fat, but a large waist circumference reliably predicts higher visceral fat levels.
For a more precise breakdown, a DXA scan (dual X-ray absorptiometry) can differentiate between bone mineral, lean mass, and fat mass throughout your body. DXA specifically measures visceral adipose tissue, giving you an actual number for the internal abdominal fat around your organs. The scan is quick, painless, and uses very low-dose X-rays. CT scans and MRIs can also quantify visceral fat with high accuracy, though they’re typically reserved for research settings rather than routine checkups.
Visceral Fat Responds Well to Lifestyle Changes
The good news is that visceral fat is more metabolically active than subcutaneous fat, which means it responds faster to changes in diet and exercise. Many people notice that the first fat they lose when they start moving more or eating better is from their midsection, even if subcutaneous fat on their arms or thighs seems to hang on longer.
Aerobic exercise is consistently the most effective tool for reducing visceral fat. Walking, cycling, swimming, or any activity that raises your heart rate for sustained periods targets deep abdominal fat preferentially. Strength training helps too, largely by improving insulin sensitivity and increasing the amount of energy your muscles burn at rest. Reducing refined sugar and processed carbohydrates lowers the insulin spikes that drive visceral fat storage. Managing stress and improving sleep quality both help keep cortisol levels in check, removing one of the hormonal drivers that encourage fat to settle deep in the abdomen.
Spot-reducing belly fat through targeted ab exercises is a persistent myth. Crunches strengthen the muscles beneath the fat, but they don’t selectively burn the fat on top of them. Visceral fat shrinks in response to overall energy balance and hormonal shifts, not localized muscle work.