When monitoring public health and assessing individual risk for cardiovascular disease (CVD), clinical practitioners measure both Body Mass Index (BMI) and waist-to-hip ratio. Why is the waist-to-hip ratio generally considered a more reliable predictor of CVD risk and mortality than BMI?
The waist-to-hip ratio indicates abdominal (visceral) fat distribution, which is metabolically active and directly linked to CVD risk, whereas BMI cannot distinguish between fat distribution and muscle mass.
BMI only measures subcutaneous fat deposits, whereas the waist-to-hip ratio provides a direct percentage measurement of total essential body fat.
Waist-to-hip ratio is a direct biomarker for inherited hypercholesterolaemia, whereas BMI is purely an indicator of daily caloric surplus.
BMI is highly unreliable because body weight fluctuates significantly due to daily changes in bone density, whereas waist-to-hip ratio is unaffected by changes in body composition.