Key result
Preoperative weight loss is linked to greater 8-year postoperative BMI reduction compared to preoperative weight gain.
Why the study?
Preoperative weight changes, their predictors, and their subsequent implications on postoperative BMI reduction have not been well described in adolescents preparing for bariatric surgery.
Does preoperative weight change predict postoperative BMI reduction in adolescents undergoing bariatric surgery?
Observational (n=123)
Yes
Does preoperative weight change predict postoperative BMI reduction in adolescents undergoing bariatric surgery?
Absolute Event Rate: -21% vs -15%
p-value: p=0.11
Preoperative weight change in adolescents preparing for bariatric surgery does not significantly predict postoperative BMI loss up to 8 years.
Preoperative weight change was not associated with 8-year BMI outcomes after adolescent bariatric surgery; leaves open whether preoperative optimization improves results.
Objective Preoperative weight changes, predictors of weight changes, and subsequent implications on postoperative BMI reduction in adolescents preparing for bariatric surgery (MBS) have not been well described. Methods Teen–Longitudinal Assessment of Bariatric Surgery (Teen‐LABS) consortium (prospective, observational MBS study at five centers from 2007 to 2011) participants who completed the preoperative phase within 3–9 months of initial visit were included in this analysis ( n = 123). Participants were categorized into preoperative weight groups: > 1% loss, stable, or > 1% gain. Demographic, anthropometric, socioeconomic, medical, and behavioral data were analyzed. Postoperative percent BMI loss at 1, 5, and 8 years by weight group was compared. Results Preoperatively, 50% of participants lost weight, 20% remained stable, and 30% gained weight. The mean percent weight change by group was −4.2% (standard deviation [SD] 2.9%), +0.02% (SD 0.6%), and +5.2% (SD 5.3%), respectively. Eight‐year postoperative BMI change was −21% (lost) and −26% (stable), compared to −15% among those who gained weight preoperatively ( p = 0.11). No differences in preoperative weight‐related behaviors were observed between groups. Conclusions Most adolescents preparing for MBS maintained ±5% of their baseline weight. No statistically significant differences in postoperative BMI loss or factors predicting preoperative weight change were identified. Trial Registration ClinicalTrials.gov identifier: NCT00474318
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Ogle et al. (2026) conducted an observational in Adolescents preparing for metabolic and bariatric surgery (n=123). Preoperative weight loss (>1% loss) vs. Preoperative weight gain (>1% gain) or stable weight was evaluated on 8-year postoperative BMI change (p=0.11). Preoperative weight change in adolescents preparing for bariatric surgery did not significantly impact 8-year postoperative BMI loss (-21% for loss, -26% for stable, -15% for gain; p=0.11).
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