Which statement correctly describes serum albumin as a nutritional biomarker?

• A. It reflects inflammation and clinical outcome more than nutrition
• B. It directly measures recent protein intake
• C. It rapidly responds to dietary changes
• D. It is unaffected by fluid shifts

Answer: (A)

Serum albumin is shaped more by inflammation and overall clinical status than by recent protein intake. The liver makes albumin, but during inflammation the body shifts its priorities through the acute-phase response, which lowers albumin levels independent of how much protein a person has eaten. Its long half-life means it changes slowly, so it doesn’t quickly reflect short-term dietary changes. Additionally, fluid shifts can dilute or concentrate albumin, further confounding interpretation as a nutritional marker. Because of these factors, low albumin often signals inflammation, illness severity, or prognosis rather than simply poor nutrition.