Document Detail

Sleeve gastrectomy and Roux-en-Y gastric bypass exhibit differential effects on food preferences, nutrient absorption and energy expenditure in obese rats.
MedLine Citation:
PMID:  23044855     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: All available treatments directed towards obesity and obesity-related complications are associated with suboptimal effectiveness/invasiveness ratios. Pharmacological, behavioral and lifestyle modification treatments are the least invasive, but also the least effective options, leading to modest weight loss that is difficult to maintain long-term. Gastrointestinal weight loss surgery (GIWLS) is the most effective, leading to >60-70% of excess body weight loss, but also the most invasive treatment available. Sleeve gastrectomy (SGx) and Roux-en-Y gastric bypass (RYGB) are the two most commonly performed GIWLS procedures. The fundamental anatomic difference between SGx and RYGB is that in the former procedure, only the anatomy of the stomach is altered, without surgical reconfiguration of the intestine. Therefore, comparing these two operations provides a unique opportunity to study the ways that different parts of the gastrointestinal (GI) tract contribute to the regulation of physiological processes, such as the regulation of body weight, food intake and metabolism.
DESIGN: To explore the physiologic mechanisms of the two procedures, we used rodent models of SGx and RYGB to study the effects of these procedures on body weight, food intake and metabolic function.
RESULTS: Both SGx and RYGB induced a significant weight loss that was sustained over the entire study period. SGx-induced weight loss was slightly lower compared with that observed after RYGB. SGx-induced weight loss primarily resulted from a substantial decrease in food intake and a small increase in locomotor activity. In contrast, rats that underwent RYGB exhibited a substantial increase in non-activity-related (resting) energy expenditure and a modest decrease in nutrient absorption. Additionally, while SGx-treated animals retained their preoperative food preferences, RYGB-treated rats experienced a significant alteration in their food preferences.
CONCLUSIONS: These results indicate a fundamental difference in the mechanisms of weight loss between SGx and RYGB, suggesting that the manipulation of different parts of the GI tract may lead to different physiologic effects. Understanding the differences in the physiologic mechanisms of action of these effective treatment options could help us develop less invasive new treatments against obesity and obesity-related complications.
N Saeidi; E Nestoridi; J Kucharczyk; M K Uygun; M L Yarmush; N Stylopoulos
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2012-10-09
Journal Detail:
Title:  International journal of obesity (2005)     Volume:  36     ISSN:  1476-5497     ISO Abbreviation:  Int J Obes (Lond)     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  2013-04-22     Revised Date:  2014-04-18    
Medline Journal Info:
Nlm Unique ID:  101256108     Medline TA:  Int J Obes (Lond)     Country:  England    
Other Details:
Languages:  eng     Pagination:  1396-402     Citation Subset:  IM    
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MeSH Terms
Analysis of Variance
Body Weight
Disease Models, Animal
Energy Metabolism*
Food Preferences*
Gastric Bypass*
Intestinal Absorption*
Obesity / metabolism,  physiopathology,  surgery*
Rats, Long-Evans
Weight Loss
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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