Effectiveness of a Digital Behavioral Intervention Program for Overweight and Obese Patients

Inclusion Criteria: 1. Fulfilling the World Health Organization diagnostic criteria for infertility, defined as failure to achieve or sustain a clinical pregnancy after ≥1 year of regular unprotected sexual intercourse among couples of reproductive age; 2. patients aged 20-40 years seeking assisted reproductive technology (ART) treatment; 3. Body mass index (BMI) \>=24 kg/m²; 4. Willingness to undergo randomization; 5. Absence of significant comorbidities (e.g., uncontrolled hypertension, diabetes mellitus, malignancies); 6. Commitment to participate in and complete the intervention protocol. Exclusion Criteria: 1. History of major systemic diseases (e.g., cardiovascular disorders, chronic respiratory diseases) or psychiatric disorders (e.g., schizophrenia, major depressive disorder); 2. Current or prior participation in other clinical trials within the past 3 months; 3. Medical contraindications to physical exercise (e.g., severe osteoarthritis, uncontrolled arrhythmias); 4. Previous weight-loss interventions, including pharmacological therapy (e.g., orlistat, liraglutide) or bariatric surgery.