Which is not a common method to measure body composition?

• A. Body Mass Index (BMI)
• B. Skinfold measurements
• C. Bioelectrical impedance
• D. DEXA

Answer: (A)

Measuring body composition involves estimating how much of the body is fat, muscle, and other tissues. BMI isn’t a direct measure of body composition; it’s simply weight relative to height and doesn’t distinguish fat from lean tissue. Because of that, it can misclassify individuals (for example, a muscular person might have a high BMI but low body fat). The other methods provide more direct information about fat and lean mass: skinfold measurements use calipers at specific sites to estimate subcutaneous fat; bioelectrical impedance analyzes how body tissues conduct electricity to infer body fat and lean mass; and DEXA scans separate bone, fat, and lean tissue to give a precise body composition breakdown. So BMI is not a common method for measuring body composition in the sense of directly assessing fat and lean mass.