BMI does not tell muscle from fat, does not apply to children, pregnancy or athletes, and its thresholds come from a narrow population. It is one number among several, not a conclusion about your health.

The waist-to-hip ratio is marked differently for each: 0.85 for women and 0.90 for men (WHO report, 2008). It is a mark on a scale, not a diagnostic threshold.

Body shape is a convention from sewing practice, not a standard or a judgment. It suggests where a garment is likely to pull or hang loose, and says nothing about what your shape should be.