Which electrolyte imbalance is most commonly associated with refeeding syndrome?

Rationale: A. Magnesium levels may actually drop, not rise, during refeeding syndrome due to intracellular shifts. B. Calcium levels are typically not elevated as a direct result of refeeding syndrome. C. Refeeding syndrome occurs when malnourished patients receive rapid carbohydrate reintroduction, triggering insulin release. This drives phosphate, potassium, and magnesium into cells, with phosphate depletion being the hallmark and most clinically significant electrolyte disturbance. Hypophosphatemia can cause muscle weakness, respiratory failure, and cardiac dysfunction. D. Sodium levels may fluctuate, but hyponatremia is not the primary concern in refeeding syndrome.