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Intestinal Energy Absorption is Associated with Post-Bariatric Surgery Weight Loss.

Yunzhi Qian1, Alicia Sorgen2, Kristine Steffen3,4

  • 1Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

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|January 10, 2026
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Summary
This summary is machine-generated.

Metabolic and bariatric surgery (MBS) impacts intestinal energy absorption. Lower energy absorption after surgery correlates with better long-term weight loss, aiding in managing obesity effectively.

Keywords:
Bariatric surgeryEnergy absorptionFecal energy contentNutrition

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Area of Science:

  • Bariatric Surgery
  • Obesity Management
  • Gastroenterology

Background:

  • Metabolic and bariatric surgery (MBS) is effective for severe obesity but has variable outcomes.
  • Suboptimal weight loss and recurrence occur in a significant patient subset.
  • The role of intestinal energy absorption post-MBS is not well understood.

Purpose of the Study:

  • To assess the relationship between diet, intestinal energy absorption, and weight outcomes in patients post-MBS.
  • To investigate how energy absorption changes following gastric bypass or sleeve gastrectomy.
  • To identify predictors of weight loss success after MBS.

Main Methods:

  • Caloric intake and fecal energy density (bomb calorimetry) measured pre- and post-MBS.
  • Longitudinal association analyzed using linear mixed-effects models.
  • Random forest algorithms used for forecasting weight loss based on energy absorption.

Main Results:

  • Intestinal energy absorption capacity is altered by MBS.
  • Higher fecal energy content (lower absorption) at early time points predicts better long-term weight loss.
  • Dietary intake was not significantly associated with energy absorption.

Conclusions:

  • MBS modifies post-surgical energy absorption.
  • Reduced intestinal energy absorption is linked to sustained weight reduction.
  • Findings may inform diagnostic tools and treatment guidelines for managing weight loss outcomes.