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TL;DR
This prospective cohort study of 124 patients found that associations between dietary intake (energy, protein, fat) and weight loss outcomes were significant at 12 months post-surgery but were no longer significant at 24 months.
Nutrients · 7 authors, 6 centres
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This prospective cohort study of 124 patients found that associations between dietary intake (energy, protein, fat) and weight loss outcomes were significant at 12 months post-surgery but were no longer significant at 24 months.
This prospective, dual-site cohort study of 124 U.S. patients examined longitudinal associations between dietary intake and weight loss outcomes following Roux-en-Y gastric bypass or sleeve gastrectomy. Patients were classified as 'responders' or 'suboptimal responders' based on ≥50% excess weight loss at each time point. At 12 months, responders had significantly lower energy, protein, and total fat intake than suboptimal responders. However, these associations were no longer statistically significant at 24 months. Analysis of a reduced sample size confirmed the change was not due to attrition. Limitations include a relatively small final sample size and the potential for dietary underreporting. The results suggest that while diet is associated with weight loss in the first year after surgery, this relationship does not persist at 24 months, indicating other factors likely influence longer-term outcomes.