- Body builders
- Some high performance athletes
- Pregnant women.
BMI calculations will underestimate the amount of body fat for:
- The elderly
- People with a physical disability who are unable to walk and may have muscle wasting.BMI is also not an accurate indicator for people with eating disorders like anorexia nervosa or people with extreme obesity.
BMI is not the best measure of weight and health risk. A person’s waist circumference is a better predictor of health risk than BMI.