1 Montréal Behavioural Medicine Centre (MBMC), Centre intégré universitaire de santé et de services sociaux du Nord-de-l'Île-de-Montréal (CIUSSS-NIM), Québec, Canada; Department of Health, Kinesiology, and Applied Physiology, Concordia University, Montréal, Québec, Canada.
2 Montréal Behavioural Medicine Centre (MBMC), Centre intégré universitaire de santé et de services sociaux du Nord-de-l'Île-de-Montréal (CIUSSS-NIM), Québec, Canada; Department of Psychology, Université du Québec à Montréal, Montréal, Québec, Canada.
3 Montréal Behavioural Medicine Centre (MBMC), Centre intégré universitaire de santé et de services sociaux du Nord-de-l'Île-de-Montréal (CIUSSS-NIM), Québec, Canada; Department of Health, Kinesiology, and Applied Physiology, Concordia University, Montréal, Québec, Canada. Electronic address: Simon.Bacon@concordia.ca.

Background: Prioritizing patients for metabolic and bariatric surgery (MBS) based on their potential postoperative benefits is essential.

Objectives: To examine changes in quality of life (QoL) during the initial postoperative year among patients with diverse eligibility statuses and determine which group experiences greater benefits.

Setting: Center intégré universitaire de santé et de services sociaux du Nord-de-l'Île-de- Montréal (CIUSSS-NIM), Canada.

Methods: We categorized patients into 3 groups based on obesity class and the presence of comorbidities: Group 1 (obesity class II without comorbidities, n = 28); Group 2 (obesity class II with comorbidities, n = 36); and Group 3 (obesity class III, n = 460). QoL (Short-Form QoL questionnaire [SF-12]) and anthropometrics were measured at 6 months before, and 6 and 12 months after surgery.

Results: Repeated measures mixed models revealed a significant main effect of time (P < .001) and an interaction between time and group for the physical component of QoL (P = .007). These indicated consistent improvements across time in all groups, with the greatest benefits seen in Group 3 relative to Group 1. There were no interactions between time and group for the mental components of QoL (P = .402). There were significant interaction effects for weight and BMI (P's < .001), with Group 3 losing more weight than Groups 1 or 2.

Conclusions: All groups that underwent MBS had improvements in the physical aspects of QoL and weight over time, even those who have traditionally not be considered eligible for MBS (i.e., Group 1). This provides a starting point to explore the importance of not excluding patients due to their weight and comorbidity status and setting comprehensive eligibility criteria encompassing all patients who might benefit from MBS, beyond just weight loss.