260000-person cohort shows WHR reclassifies 18% of normal-BMI adults to elevated CVD risk

The study added waist circumference and waist-to-hip ratio to BMI categories in nine pooled cohorts. Among normal-weight participants, 5% had high waist circumference and 18% had high WHR; both markers correlated with increased myocardial infarction, stroke, heart failure, atrial fibrillation, and mortality. Obesity with low WHR showed no excess risk versus normal weight with low WHR except lower all-cause mortality.

Visceral fat metrics capture inflammatory and metabolic pathways BMI misses. Prior UK Biobank and Framingham analyses reported similar reclassification rates but lacked the nine-outcome granularity or 20-year span. The single baseline measurement and absence of activity or genetic covariates limit causal inference on change over time.

Primary-care panels that retain BMI-only thresholds will continue to under-identify risk in normal and overweight strata while over-treating some obese patients with low central adiposity. Operational shift requires integrating tape-measure WHR into intake protocols and updating risk calculators within two years.

Guideline committees will test WHR thresholds against existing pooled-cohort equations; adoption above 20% of US practices by 2028 would trigger electronic health record default changes.