Visceral Fat Is the Number BMI Was Never Measuring
Waist-to-height ratio costs nothing, takes ten seconds, and predicts metabolic risk better than body mass index.
Dr. Laila Varma
Contributing Clinician
Sep 5, 2026 • 9 min
What the data says
0.5
Waist-to-height ratio threshold above which cardiometabolic risk rises consistently across populations.
Source: Pooled anthropometric risk analyses
BMI was designed to describe populations, not individuals, and it cannot distinguish muscle from fat or subcutaneous fat from visceral fat. The fat stored around the liver, pancreas, and intestines is the depot most tightly linked to insulin resistance and atherogenic lipid profiles.
Waist circumference divided by height is the most useful free proxy. Keeping the ratio below 0.5 is a reasonable target for most adults, and it performs better than BMI at flagging risk in people of South Asian and East Asian ancestry, where metabolic disease appears at lower body weights.
Visceral fat is also the depot that responds first. Early weight loss draws disproportionately from it, which is why insulin sensitivity and liver-fat markers often improve well before the scale reflects much.
For tracking, measure at the same point each time — the midpoint between the lowest rib and the top of the hip bone, at the end of a normal exhale — and pair it with ApoB and fasting insulin rather than reading the tape alone.
Editorial note: this article summarises published research for general information. It is not medical advice. Discuss any intervention with a qualified clinician.
