Which statement best defines sarcopenia?

• A. Loss of muscle tissue as a natural part of the aging process.
• B. Increase in adipose tissue with age.
• C. Rapid loss of bone density.
• D. Enlargement of muscle fibers with training.

Answer: (A)

Sarcopenia describes the age-related loss of skeletal muscle mass and strength that can lead to functional decline. The statement that loss of muscle tissue occurs with aging directly captures this idea, focusing on the muscle component that defines the condition, rather than other aging changes. The other options point to increased fat with age, rapid bone density loss (osteoporosis), or muscle growth with training (hypertrophy), none of which define sarcopenia. In practice, sarcopenia involves not just reduced muscle size but also diminished strength and performance, influenced by activity level and nutrition, which reinforces why the muscle-tissue loss description is the best match.