Inclusion Criteria:  Elective surgery for esophagogastric cancer (there was a clear pathological diagnosis before surgery); NRS2002≥3; Preoperative BIA examination was performed.  Exclusion Criteria:  Discharged from a hospital within 24 hours; No BIA examination and not suitable for BIA examination (such as ascites, edema, amputation and pace-maker); Hepatic insufficiency (alanine transaminase/aspartate transaminase ratio 200% above normal range or bilirubin>3mg/dL) ; Renal insufficiency (serum creatinine>1.5mg/dL); Emergency operation; Pregnancy; Missing the postoperative information follow-up data.