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Ileal Transposition in Rats Reduces Energy Intake, Body Weight, and Body Fat Most Efficaciously When Ingesting a
Edit Somogyi1,2,3, David Sigalet3, Thomas E Adrian4
1School of PhD Studies, University of Physical Education, Budapest, Hungary.
Obesity Surgery
|April 29, 2020
Summary
Dietary protein content significantly impacts weight loss after ileal transposition (IT) surgery. A high-protein diet (HP) most effectively reduced weight and adiposity, with reduced energy intake being the primary driver of weight loss.
Area of Science:
- Bariatric surgery research
- Metabolic effects of gastrointestinal surgery
- Nutritional science and endocrinology
Background:
- Ileal transposition (IT) is a bariatric procedure that allows for the study of hindgut effects on weight loss and adiposity.
- Understanding the influence of dietary macronutrient composition is crucial for optimizing the outcomes of bariatric interventions.
Purpose of the Study:
- To investigate the role of dietary macronutrient content (high-fat, high-carbohydrate, high-protein) on the effects of ileal transposition in a rat model.
- To determine how different diets modulate weight loss, body composition, and hormonal responses following IT.
Main Methods:
- Male Lewis rats were fed one of three isocaloric liquid diets (high-fat, high-carbohydrate, or high-protein) and underwent either IT or sham surgery.
- Measurements included body weight, energy intake, energy efficiency, body composition, and changes in plasma gut hormones (GIP, GLP-1, PYY, neurotensin, insulin).
Main Results:
- The high-protein (HP) diet most effectively supported IT-induced reductions in body weight and adiposity, although lean mass was also reduced.
- Energy intake was the primary factor explaining post-operative weight change (80%), with the high-carbohydrate diet resulting in the least weight loss.
- IT upregulated levels of GLP-1, neurotensin, and PYY, with PYY showing a negative correlation to cumulative energy intake.
Conclusions:
- Reduced energy intake is the key mechanism underlying IT-induced weight loss, with the HP diet demonstrating the highest efficacy.
- Ileal transposition upregulates gut hormones PYY, GLP-1, and neurotensin, with PYY potentially playing a specific role in reducing intake and promoting weight loss post-IT.
