PROGAIN Trial in Gastric Cancer Surgery

Inclusion Criteria: * Adults aged 19 years or older scheduled to undergo gastric cancer surgery. - Patients who have provided written informed consent to participate in this study. Exclusion Criteria: * Patients with uncontrolled severe systemic diseases (e.g., decompensated diabetes, cerebrovascular event within the last 6 months, sepsis, heart failure). * Patients who have received intravenous parenteral nutrition within 7 days prior to randomization. * Patients with severe metabolic abnormalities confirmed by preoperative laboratory tests, including but not limited to: * Triglyceride \> 400 mg/dL * AST or ALT \> 3 x Upper Limit of Normal (ULN) * Total Bilirubin \> 3 x ULN * Serum Creatinine \> 2 x ULN * HbA1c \> 9.0% * Potassium \< 3.0 mEq/L or \> 6.0 mEq/L * Calcium \> 12.5 mg/dL * Sodium \> 155 mmol/L * Magnesium \> 3.0 mg/dL * Patients deemed inappropriate for participation in this clinical trial by the investigator.