Waist-to-height and body fat

Belly fat says more about heart and metabolic risk than weight alone. A simple rule from UK guidance: keep your waist under half your height. Relative fat mass (RFM) turns the same two numbers into a body-fat estimate.

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Source: Ashwell M et al., BMJ Open 2016 (waist-to-height 0.5); Woolcott OO & Bergman RN, Sci Rep 2018 (RFM); NICE NG246 (2025).