Summary Background Growing evidence supports the efficacy of paediatric bariatric surgery. However, there is a paucity of data examining adolescent outcomes post surgery. Among adults, studies have shown that early weight loss is associated with long‐term weight loss. Therefore, the aim of our study was to investigate the association between early weight loss at 3 months with longer‐term weight loss at 12 and 24 months in adolescents post surgery. We hypothesized that patients who have greater weight loss within the first 3 months will have greater weight loss at 12 and 24 months post surgery. Methods A retrospective chart review of bariatric surgery patients (n = 28) was conducted. Anthropometric measurements at baseline and 3, 12, and 24 months were analysed. Results Percent of excess weight loss (%EWL) at 3, 12, and 24 months were 33.6 ± 11.3%, 55.0 ± 20.5%, and 55.1 ± 27.1%, respectively. %EWL at 3 months was positively associated with %EWL at 12 and 24 months (P < 0.05). Receiver operating characteristic curve results identified a cut‐off of greater than or equal to 30%EWL at 3 months predicted successful weight loss, defined as greater than or equal to 50%EWL at 12 and 24 months. Conclusion These findings demonstrate that majority of weight loss among adolescents occurs within the first postoperative year. Greater %EWL by 3 months post surgery predicts successful and sustained weight loss over time.

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