What is a "normal" waist circumference for a man over 40?

The clinical thresholds for waist circumference in men are: below 37 inches (94 cm), lower risk (recommended target in some guidelines); 37–40 inches (94–102 cm), intermediate risk (metabolic risk increasing, recommended for intervention); above 40 inches (102 cm), high risk, associated with substantially elevated rates of type 2 diabetes, cardiovascular disease, and all-cause mortality in large cohort studies (WHO Expert Consultation, Lancet, 200415268-3)).

The threshold varies by ethnicity, populations of Asian descent have higher metabolic risk at lower waist circumferences: the equivalent clinical risk thresholds for men of East Asian, South Asian, and East African descent are approximately 90 cm (35 inches), making the "40-inch" cutoff appropriate primarily for men of European and African American descent. Men of South Asian descent (including East African Asian descent) should use the lower threshold for clinical decision-making.

Honesty Scale: Solid (1) for waist circumference thresholds in the established epidemiological literature.

What to do: Measure your waist circumference at the navel level today. Write it down. Remeasure every 4 weeks during any weight management or exercise program. Waist circumference is more clinically informative than scale weight for tracking visceral fat change because weight can be stable while waist reduces (muscle gain + visceral fat loss), which is metabolically positive.

For the full picture, read The Visceral Fat Deep Dive