Abstract: Gastric surgery inevitably alter gastrointestinal anatomy and function.This can lead to maldigestion,malabsorption,nutrient deficiencies,and metabolic disturbances.Perioperative nutritional status is closely linked to postoperative convalescence,immune competence,complication rates,and overall survival.Evidence-based and individualized nutritional support is therefore crucial,as it not only improves the metabolic milieu and promotes the recovery of gastrointestinal function but also accelerates overall rehabilitation,shortens hospital stays,and reduces complication and readmission rates.

Key words: gastric cancer; gastrectomy; bariatric surgery; nutrition metabolism