Which sequence lists the three phases of the metabolic response to critical illness?

Which sequence lists the three phases of the metabolic response to critical illness?

• A. The stress phase; The catabolic phase; The anabolic phase
• B. The anabolic phase; The stress phase; The catabolic phase
• C. The catabolic phase; The anabolic phase; The stress phase
• D. The stress phase; The anabolic phase; The catabolic phase

Answer: (A)

The sequence reflects how the body's metabolism changes after critical illness: first the stress response, then a sustained catabolic phase, and finally an anabolic recovery phase. Immediately after injury or severe illness, stress hormones and cytokines drive energy mobilization, insulin resistance, and immune activity to support vital functions. This leads into a prolonged catabolic state where muscle and other tissues are broken down to provide substrates for energy and repair, often with negative nitrogen balance and high energy expenditure. As stabilization occurs and nutrition therapy supports healing, anabolic processes predominate, supporting tissue repair and restoration of lean body mass. That order—stress, then catabolic, then anabolic—best matches the physiological progression. The other sequences would imply anabolic activity occurring before or during the initial stress response, which doesn’t fit how the metabolic response unfolds.

The sequence reflects how the body's metabolism changes after critical illness: first the stress response, then a sustained catabolic phase, and finally an anabolic recovery phase. Immediately after injury or severe illness, stress hormones and cytokines drive energy mobilization, insulin resistance, and immune activity to support vital functions. This leads into a prolonged catabolic state where muscle and other tissues are broken down to provide substrates for energy and repair, often with negative nitrogen balance and high energy expenditure. As stabilization occurs and nutrition therapy supports healing, anabolic processes predominate, supporting tissue repair and restoration of lean body mass. That order—stress, then catabolic, then anabolic—best matches the physiological progression. The other sequences would imply anabolic activity occurring before or during the initial stress response, which doesn’t fit how the metabolic response unfolds.