Conclusion: Overall, the quality of the evidence ranged from low to moderate. Six out of seven pretest-posttest studies reported significant difference (P <0.05) on MEB and had small to large effect size after receiving psychotherapeutic interventions. Five out of eight RCT reported a positive and significant effect (P <0.05) on MEB and four had medium to large effect size between the groups receiving psychotherapeutic interventions and the control group. Follow-up period after intervention ranged from six weeks to 48 months. Results: A total of 15 studies met the inclusion criteria (eight RCT and seven pretest-posttest studies), 752 participants were identified, 80.3% were female and the average participants age was 46.1 years (SD ± 6.6). We included studies published between January 1st 1990 and October 18th 2019, with pre- or postoperative psychological treatment approaches in bariatric surgery patients aimed to improve MEB. Literature review was performed in the databases PubMed, ScienceDirect, Cochrane Library, and Web of Science. Materials and Methods: This systematic review was registered in PROSPERO. A systematic review was conducted to evaluate the effectiveness of psychological treatment approaches on MEB in bariatric surgery patients. ABSTRACT Introduction: Maladaptive eating behaviors (MEB) are highly prevalent among bariatric surgery patients and have been demonstrated to be important contributors for weight loss outcomes.

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