Why fat distribution matters
Visceral fat — the kind that accumulates around abdominal organs and inflates the waist — is metabolically active in ways that subcutaneous fat (under the skin, around hips and thighs) is not. It releases inflammatory cytokines, drives insulin resistance, and is the strongest single anthropometric predictor of type 2 diabetes and coronary heart disease in WHO meta-analyses.
Apple vs pear
The colloquial “apple-shaped” (high WHR, fat around the middle) vs “pear-shaped” (low WHR, fat around hips and thighs) is the public-health version of this finding. Pear-shaped people with the same BMI as apple-shaped people have lower rates of metabolic syndrome on average. Genetics, sex hormones, and post-menopausal status all influence the pattern.
What WHR doesn’t capture
Like BMI and WHtR, this is a population-level screening signal — not a diagnosis. Athletes with very narrow waists relative to muscular hips can register an artificially low WHR; some genetically thin people can register an artificially high one. Use this as one input among many.