Abstract: Objective To investigate the current status of postoperative dietary behavior in patients undergoing weight loss surgery and analyze its influencing factors.Methods From July 2021 to August 2023,187 patients who underwent weight loss surgery in our hospital were included.This study conducted a survey on patients using the Dutch Eating Behavior Questionnaire (DEBQ) and a self-made clinical data collection form for weight loss surgery patients.The weight loss and DEBQ score changes before and 1 year after surgery were observed.According to the DEBQ evaluation results after 1 year,the patients were assigned into a successful restriction group and a non successful restriction group,and their general conditions were compared between the two groups.Logistic regression model was used to screen the influencing factors of postoperative dietary behavior in patients undergoing weight loss surgery.Results One year after surgery,the BMI,extrinsic eating score,and emotional eating score were all lower than those before surgery (P<0.05),and the restrictive eating score was higher than that before surgery (P<0.05).142 cases (75.94%) were successfully restricted in diet after surgery,and 45 cases (24.06%) were not successfully restricted in diet.There were statistically obviously differences in the residential status,impulse control score,resistance to temptation score,perceived social support scale（PSSS) score,and depression status between the successful restriction group and the non successful restriction group(P<0.05).Logistic regression analysis showed that depression was a risk factor for postoperative non successful restrictive diet in patients,while impulse control ,resistance to temptation ,and high PSSS score were protective factors(P<0.05).Conclusion Patients undergoing weight loss surgery experience a obviously decrease in postoperative weight and an improvement in dietary behavior.But there are still some patients who have non restrictive or failed restrictive eating habits,which are related to impulse control,resistance to temptation,social support,and depression.

Key words: weight loss surgery; obesity; dietary behavior; influence factor