Body Mass Index (BMI) can accurately distinguish between excess fat, muscle, and bone mass.

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When evaluating Body Mass Index (BMI), a key starting point is understanding what BMI measures. BMI mathematically relates a person’s weight to their height and provides a single numeric value rather than a direct assessment of body composition.
Option 1: 'True' – This statement asserts that BMI can accurately distinguish between excess fat, muscle, and bone mass. In reality, BMI does not perform this differentiation. It may classify a person with high muscle mass as overweight or obese because muscle weighs more than fat, even though their body fat percentage is low. It also cannot separate bone density from overall weight. Therefore this option misstates BMI’s capabilities.
Option 2: 'False' – This statement claims that BMI cannot accurately distinguish fat, muscle, and bone mass, which aligns with what BMI actually measures and its well-known limitation. Since BMI conflates body weight with height without evaluating body composition, it often misclassifies individuals with atypical body compositions and does not provide specific fat vs. lean tissue information. This option correctly identifies the limitation of BMI.
By weighing each option against what BMI is designed to assess, we see that the claim in Option 1 is inaccurate while Option 2 correctly reflects BMI’s lack of precision in distinguishing body compartments like fat, muscle, and bone.

KNHES 5416 AU2025 (13351) Exam 2

Body Mass Index (BMI) can accurately distinguish between excess fat, muscle, and bone mass.

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