The answer so far
Subcutaneous fat sits under the skin; visceral fat is deeper inside the abdomen, around internal organs. Both are types of fat tissue, which has normal roles in the body. A waist measurement or a scale cannot tell exactly how much visceral fat someone has. Scans can estimate it, but a number alone does not diagnose a person’s health.12
On this page
Visceral fat and fat under the skin: what is the difference? Choose a step to explore this subject in more detail.
Why does location matter?
Picture two stores in the same neighbourhood: one is just beneath the skin, the other is deeper inside the abdomen. Fat can be stored in both places. Fat tissue stores energy and also participates in signalling; it is not simply unwanted material. Differences in distribution are studied because they are associated with different patterns of metabolic health. A population association does not determine an individual’s future. Explore tesamorelin’s separate liver-fat and biopsy study. A local injection under the skin is a different question from visceral fat; compare fat-dissolving and weight-loss claims.12
Can I tell which kind I have by looking?
Not reliably. A belly contains more than one tissue, and neither appearance nor the amount that can be pinched tells you the exact amount around internal organs. Two people with similar weight or waist size can have different distributions. The Framingham study used CT scans and found variation in abdominal fat distribution across its participants.1
What can a waist measurement or BMI tell me?
Waist circumference can provide useful information about abdominal size alongside other health measures, but it does not separately measure visceral and subcutaneous fat. Body mass index (BMI) relates weight to height; it does not measure body fat directly or distinguish fat from muscle and water. These measures are pieces of context, not complete diagnoses. A clinician can explain which assessments are useful for a particular person.12
What does a CT or MRI scan measure?
Imaging can distinguish abdominal fat compartments and researchers may report an area from a slice or an estimated volume. Different protocols and slice positions can affect results, so ask what was actually measured. A scan used in a trial is not a recommendation that a healthy reader seek a CT scan; scans have costs and CT uses radiation. See how the tesamorelin trial used CT for an example.34
Does less visceral fat automatically mean better health?
Higher visceral-fat accumulation is associated with metabolic risks in many populations, but an association is not a personal diagnosis and a changed scan alone does not prove fewer future heart attacks. Health also depends on factors such as blood pressure, blood glucose, activity, sleep and individual history. For the difference between fat used for fuel, stored body fat and scale weight, continue with fat burning and fat loss.12
Sources, kept close.
Selected supporting sources; this is not a complete literature review.
- Patterns of Abdominal Fat Distribution: The Framingham Heart StudyDiabetes Care / PubMed Central · Observational population study using CT
- Overweight and obesity in adultsNational Institutes of Health · Public health overview
- Regional intra-subject variability in abdominal adiposity limits usefulness of computed tomographyInternational Journal of Obesity / PubMed · Human imaging methodology study
- Metabolic Effects of a Growth Hormone–Releasing Factor in Patients with HIVNew England Journal of Medicine · Randomised placebo-controlled trial; United States and Canada; 2007; manufacturer funded