Visceral Fat (Imaging-Quantified)

Measurement modalities

• MRI: gold standard; radiation-free; expensive.
• CT: single-slice at L3-L4 is common in research; radiation dose is a limit for repeated measurement.
• DEXA with visceral-fat algorithm: available in modern DEXA scanners; validated against MRI within useful precision.
• Bioimpedance: convenient but poor accuracy for VAT specifically.

Reference ranges

• Population norms: VAT area on CT typically < 100 cm² in low-risk adults; > 150 cm² is elevated risk.
• DEXA VAT mass: > 800 g associated with adverse cardiometabolic risk in women, > 1000 g in men (approximate thresholds).

Why it matters more than BMI

• BMI misclassifies muscular individuals as overweight and normal-BMI individuals with elevated VAT as low-risk.
• "Normal-weight metabolic obesity" is a well-recognised phenotype with elevated cardiometabolic risk.

Interventions

• Weight loss preferentially reduces VAT.
• Aerobic exercise reduces VAT even without weight change.
• GLP-1 agonists and bariatric surgery produce the largest VAT reductions.
• Fructose restriction may specifically reduce hepatic fat (a related outcome).

More on this topic

• Best Preventive Screening and Imaging by Decade — Best-of guide.

Related entries

DEXA scan, Metabolic syndrome, Metaflammation, GLP-1 agonists.