Full Breakdown
Belly Fat Outperforms BMI in Predicting Cardiovascular Risk, Large Cohort Study Finds
8/15/2026, 2:51:46 AM
Core Findings
A cross-cohort analysis of ?260,000 adults without prior coronary heart disease tracked participants for an average of ?20 years. Researchers measured body-mass index (BMI), waist circumference (WC) and waist-to-hip ratio (WHR) and evaluated nine cardiovascular outcomes, including heart attack, stroke, heart failure, atrial fibrillation, coronary heart disease, cardiovascular death and all-cause mortality. Within every BMI category, higher WC or WHR was linked to substantially higher adjusted incidence rates for each outcome. Among normal-weight individuals, 5 % had a high WC and 18 % a high WHR; among the overweight, 39 % had a high WC and 40 % a high WHR; among those with obesity, 9 % had a low WC while 45 % had a low WHR.
Background & Context
BMI—weight (kg) divided by height (m²)—has long been the standard clinical tool for categorising weight status, but it does not indicate where fat is stored. Abdominal (visceral) fat surrounds internal organs and is metabolically active, contributing to diabetes, hypertension, dyslipidaemia and atherosclerosis. Clinicians therefore use simple measures of central adiposity, such as WC and WHR, to capture risk that BMI alone may miss.
Data & Statistics
- Study population: 259,351 with WC data; 218,984 with WHR data.
- Clinical cut-offs for high WC: > 88 cm (women), > 102 cm (men); high WHR: > 0.85 (women), > 0.90 (men).
- Relative risk increase for normal- or overweight-BMI individuals with high WC or WHR ranged from 15 % to 50 % across the nine outcomes.
- Population-attributable fractions for high WC among people with obesity: 48.9 % of heart-failure events, 46.2 % of atrial-fibrillation events, 35.4 % of coronary-heart-disease events, 36.3 % of coronary-heart-disease mortality.
- Among the overweight, high WHR accounted for the largest PAFs for heart failure (23.7 %) and heart attack (22.2 %).
- WHR showed the strongest and most consistent association with all-cause mortality across all BMI categories.
Official Statements & Responses
The study, published in the *Journal of the American College of Cardiology* (JACC) and led by the Cross Cohort Collaboration, concludes that reliance on BMI alone may misclassify cardiovascular risk. The authors recommend that clinicians incorporate WC and WHR measurements into primary-prevention risk assessments, even when BMI appears reassuring. They note that the observational design precludes causal inference and that the analysis lacked data on physical activity, diet, genetic obesity risk, and longitudinal changes in abdominal fat.
Why It Matters
Because WC and WHR are inexpensive, quick bedside measurements, their integration into routine examinations could identify high-risk individuals who would otherwise be overlooked by BMI screening. This may prompt earlier lifestyle interventions or targeted therapies, potentially reducing the burden of heart failure, atrial fibrillation, coronary disease and mortality linked to central adiposity.
Verbatim Quotes
- “Indeed, it appears that WC and WHR reclassify risk defined by traditional BMI thresholds,” — Michael J. Blaha
- “Our findings emphasize the critical role of identifying elevated central adiposity, even in individuals with a normal BMI or with a BMI in the overweight range. Relying solely on BMI may result in misclassification of cardiovascular risk across a wide range of cardiovascular outcomes,” — Zeina A. Dardari, PhD, MS, lead author of the study
