Upper arm circumference can serve as an index of what nutritional attribute?

Upper arm circumference can serve as an index of what nutritional attribute?

• A. Total muscle mass and the body's protein stores.
• B. Total body fat.
• C. Bone mineral content.
• D. Hydration status.

Answer: (A)

Upper arm circumference is a good proxy for lean body mass, especially the muscle tissue in the arm and the body’s protein reserves. Muscle contains most of the body’s protein, so when protein stores are adequate and muscle mass is maintained, the arm circumference remains larger. In protein-energy malnutrition, muscle wasting reduces the circumference, signaling depleted protein stores. While fat, bone, and fluid shifts can influence the measurement to some extent, the primary value of this measurement is its reflection of muscle mass and protein stores. It is not a precise measure of total body fat, bone mineral content, or hydration status.

Upper arm circumference is a good proxy for lean body mass, especially the muscle tissue in the arm and the body’s protein reserves. Muscle contains most of the body’s protein, so when protein stores are adequate and muscle mass is maintained, the arm circumference remains larger. In protein-energy malnutrition, muscle wasting reduces the circumference, signaling depleted protein stores. While fat, bone, and fluid shifts can influence the measurement to some extent, the primary value of this measurement is its reflection of muscle mass and protein stores. It is not a precise measure of total body fat, bone mineral content, or hydration status.