“It’s Not So Simple to Refeed After Malnutrition – the Refeeding Mechanism Doesn’t Work That Way”
Kacper Nowak
2026-03-24
8 min. read
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Malnutrition can be caused by a multitude of different factors, including anorexia, cancer, or diseases associated with digestive and absorption disturbances. Malnutrition is a condition that poses a risk to both health and life, thus, it seems logical to address it by rapidly supplying energy to fortify the body. However, it transpires that a body that has previously been in a state of quantitative and qualitative deficiencies may not be equipped to handle the abrupt intake of a large number of calories, potentially leading to a range of undesirable effects collectively referred to as the refeeding syndrome.
Refeeding syndrome: Pathogenetic mechanisms and associated clinical complications
Refeeding syndrome (RS) constitutes a complex constellation of metabolic and electrolyte derangements that emerge in response to the sudden or gradual reinstatement of nutritional intake in individuals suffering from chronic malnutrition. The phenomenon was first systematically documented in the post-World War II era, when formerly incarcerated prisoners of war exhibited abrupt and severe deterioration in health—including fatal outcomes—following the introduction of a high-calorie diet, as originally reported by Schnitker, Mattman, and Bliss in 1951. While hypophosphatemia (a pathologically low serum phosphate concentration) serves as the syndrome’s hallmark diagnostic feature, RS also encompasses a broader spectrum of potentially life-threatening electrolyte imbalances that may precipitate severe cardiovascular, neurological, hematological, and pulmonary complications, as substantiated by the findings of Friedli et al. in their 2017 study.
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