Which methods can be used to measure body composition?

• A. BMI
• B. Skinfold
• C. Bioelectrical impedance
• D. All of the above

Answer: (D)

Measuring body composition means estimating how much of the body is fat versus lean tissue. Each method shown is a way to gauge that, with different approaches and information.

BMI uses height and weight to categorize overall weight status. It’s quick and simple, but it can’t tell fat from muscle, so it doesn’t directly measure body fat.

Skinfold measurements use calipers to gauge fat thickness at specific sites, giving an estimate of overall body fat percentage. It can be accurate when done by a skilled practitioner, but requires proper technique and can be less reliable in some populations.

Bioelectrical impedance analysis sends a small electrical current through the body and estimates fat-free mass and fat mass from the body’s water content and resistance. It’s fast and convenient, but readings can be influenced by hydration, recent meals, and other factors.

Because each method provides useful information about body composition and all can be used in practice, the best answer is that all of them can be used to measure body composition.