The distinction between visceral and subcutaneous fat is clinically important and widely misunderstood. Subcutaneous fat, the fat you can pinch beneath the skin, carries relatively modest health risks. Visceral fat, the fat surrounding the abdominal organs including the liver, pancreas, and intestines, is hormonally active, chronically inflammatory, and strongly associated with cardiovascular disease, type 2 diabetes, and all-cause mortality independent of total body weight.
Why Visceral Fat Is Different
Visceral fat cells express high levels of glucocorticoid receptors and are therefore particularly responsive to cortisol. They also produce significantly higher levels of pro-inflammatory cytokines including interleukin-6, tumour necrosis factor alpha, and resistin than subcutaneous adipocytes. These compounds enter the portal circulation and reach the liver directly, driving hepatic insulin resistance and systemic inflammation independent of the circulating levels from the bloodstream.
How to Measure Visceral Fat
- Waist circumference: men above 94cm and women above 80cm are at increased risk; men above 102cm and women above 88cm are at high risk. These are European populations with appropriate Isle of Man application
- Waist-to-height ratio: a ratio above 0.5 is associated with significantly elevated metabolic risk regardless of BMI
- DEXA scanning: provides precise visceral adipose tissue measurement alongside lean mass and bone density
- MRI or CT: most accurate but rarely justified outside clinical research
The Most Effective Interventions for Visceral Fat Specifically
Aerobic exercise reduces visceral fat preferentially compared to subcutaneous fat, even in the absence of significant weight loss. Resistance training combined with aerobic exercise produces greater total visceral fat reduction than either alone. Dietary changes that reduce insulin levels, including reduced refined carbohydrate intake, accelerate visceral fat mobilisation. Addressing sleep and chronic stress reduces the cortisol-mediated accumulation of visceral fat.