Effects of a Digital Cognitive-Behavioral Intervention Based on the Information-Motivation-Behavioral Skills Model on High-Protein Dietary Self-Management in Patients with Gastric Cancer

INTERVENTION: Intervention group:Patients in the intervention group received the digital high‐protein dietary nutrition support program (based on the IMB model and CBT) in addition to routine high‐protein dietary nutrition care.;Control group:The control group received routine high‐protein dietary nutrition care, which consisted of standard nutritional education at the time of admission, postoperative dietary instructions, and discharge planning, along with other usual care elements.; CONDITION: Gastric cancer PRIMARY OUTCOME: High‐protein dietary self‐management behavior;Protein intake;serum albumin;prealbumin; SECONDARY OUTCOME: Patient‐Generated Subjective Global Assessment;body weight ; body mass inde X;Lipid profile: total cholesterol (TC), triglycerides (TG), low‐density lipoprotein (LDL), and high‐density lipoprotein (HDL);Inflammatory marker:C‐reactive protein (CRP);Self‐efficacy;Quality of life;gastrointestinal symptoms; INCLUSION CRITERIA: 1.Age >= 18 years; 2.Pathologically confirmed gastric cancer with clinical stage I–III; 3.Planned to undergo radical gastrectomy; 4.Provided written informed consent and voluntarily agreed to participate.