- Meeting abstract
- Open Access
Energy expenditure changes after Roux-en-Y Gastric Bypass
© Moehlecke et al. 2015
- Published: 11 November 2015
- Energy Expenditure
- Body Composition
- Gastric Bypass
- Lean Body Mass
- Excess Weight Loss
Weight loss usually decreases energy expenditure (EE) because of changes in body composition (BC). The reduction in EE may contribute, in part, to long-term weight regain. Patients undergoing bariatric surgery might experience a decrease in EE, mainly due to reduced resting metabolic rate (RMR), explained by a decreased lean body mass (LBM), similarly to what occurs to patients after diet-induced weight loss.
To assess the effects of Roux-en-Y Gastric Bypass (RYGB) on RMR and BC in severe obese patients after RYGB.
This is a prospective cohort study with 28 patients who have undergone RYGB. RMR was assessed prior to surgery and 6 months postoperative by indirect calorimetry (IC). BC was measured at these same time-points using dual-energy X-ray. RMR was adjusted for changes in body weight (BW), i.e., kilocalories per kilogram, and in free fat mass (FFM).
Weight loss following RYGB Results in FM as well as LBM reduction, which lead to decrease RMR. Such decrease in RMR may limit weight loss over time and even favor weight regain.
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