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Introduction: Short educational programs prior to metabolic and bariatric surgery (MBS) provide information to prepare patients adequately for surgery and subsequent changes. Our knowledge of the beneficial effects of these programs on stabilizing and improving mental health of patients with obesity awaiting surgery is incomplete. The objective of this study was to assess the effects of a group-based educational program before MBS on three key factors: i) patients' mental health, ii) the program's perceived helpfulness from the patients' perspective, and iii) the effectiveness of delivering the program online via videoconferencing. Methods: Validated questionnaires for anxiety, depression, stress, and quality of life before and after the program were assessed. Additionally, participants’ perspectives of benefits were assessed. Two subgroups, one participating in face-to-face classes, the other participating online via videoconferencing, were compared. Results: Three hundred five patients with obesity waiting for MBS participated in the program. The dropout rate was 3%. On mean average, symptoms of anxiety (-1.1 units (SD 4.6), p < 0.001), depression (-0.9 units (SD 4.6), p < 0.001), and stress (-4.6 units (SD 15.6), p < 0.001) improved, while physical quality of life (+1.7 (SD 9.7), p = 0.016) and body weight (-0.3 kg (SD 8.7), p = 0.57) remained stable. Patients perceived the program as very beneficial. The results were similar between delivery methods (face-to-face versus videoconferencing). Conclusion: The educational program proved to be effective in bridging the gap in preoperative preparation while also stabilizing participants' mental health. In addition, participants perceived the program as supportive. Online participation via video conferencing can be offered as an equivalent option to face-to-face classes.

Objective: To fulfill the requirements for bariatric surgery, patients often need to participate in mandatory pre-operative lifestyle interventions (PLI). Currently, the efficacy of multi-month PLI-programs on body mass index (BMI) reduction from the start of the program (T0) through the immediate pre-operative time point (T1) to one-year post-surgery (T2), and how the amount of pre-operative BMI reduction affects post-operative outcome (T1 to T2) is unclear. The aim of this meta-analysis was to analyze the effects of PLI on body mass index (BMI) one-year post-surgery. Method: A systematic literature search was conducted according to PRISMA criteria. Randomized controlled trials that implemented PLI lasting 1-8 months before bariatric surgery were included. The BMI of the intervention group was compared with a control group before participation in the PLI (T0), after completion of the program before surgery (T1) and one-year post-surgery (T2). Finally, the impact of successful BMI reduction at T1 on BMI at T2 was analyzed. Results: N=345 patients derived from 4 studies undergoing PLI reduced their BMI at T1 by 1.5 units compared to the control group (95% CI: -2.73, -0.28). One-year post-surgery, both groups had lost comparable BMI points. The influence of reduced BMI at T1 on weight status at T2 is unclear due to the lack of available studies. Other endpoints and subgroup analyses were rarely examined. Conclusions: PLI reduce BMI before bariatric surgery more effectively than usual care. These differences are not detectable one-year post-surgery. Although a short-term energy reduction period before surgery is clearly important to minimize surgery risks, it is currently unclear whether, and if so under what circumstances, participation in a PLI is beneficial.