Why Abdominal Fat Matters Most
Fat stored around the organs — visceral fat — is metabolically active, releasing inflammatory signals and fatty acids directly toward the liver. That is the fat most strongly linked to heart disease, stroke, and type 2 diabetes.
BMI counts total weight, so it cannot tell whether your weight sits as visceral fat around your waist or as relatively benign fat on hips and thighs. WHtR measures the abdomen directly, which is why it correlates better with cardiometabolic outcomes.
The Evidence for 0.50
Large meta-analyses pooling hundreds of thousands of participants find waist-to-height ratio a stronger predictor of cardiovascular events and diabetes than BMI — and unlike BMI, one cut-off works for men and women of any height.
UK guidance (NICE) now recommends using waist-to-height alongside BMI in routine screening, with 0.50 as the action threshold for adults.
How to Measure and Use It
Wrap a tape midway between your lowest rib and the top of your hip bone, after a normal exhale. Divide by your height in the same units: a 175 cm adult should keep the waist under about 87.5 cm.
Use WHtR together with BMI, not instead of it: they answer different questions, and agreement between the two is the most informative outcome of all.
Sources
FAQ
What is a healthy waist-to-height ratio?
0.50 or less — your waist should measure less than half your height, in the same units.
Is waist-to-height better than BMI?
For predicting cardiovascular and diabetes risk, yes — meta-analyses consistently show WHtR outperforms BMI, and it stays valid for muscular people.
How do I measure my waist correctly?
Tape horizontal, midway between the lowest rib and hip bone, relaxed, at the end of a normal exhale — not over clothing.
Important disclaimer: This guide is educational information, not a substitute for professional medical advice. Discuss your individual situation with a qualified professional.