Refeeding is the controlled reinstitution of nutritional intake following a period of significant undernutrition or starvation. This academic concept and research area investigates the complex physiological, metabolic, and clinical responses to renewed nutrient provision, particularly focusing on adaptive processes, electrolyte shifts, and potential complications such as refeeding syndrome. Its significance lies in informing clinical guidelines for the safe and effective nutritional rehabilitation of malnourished individuals across various clinical settings.