Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/91923
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Type: Journal article
Title: Effects of fat and protein preloads on pouch emptying, intestinal transit, glycaemia, gut hormones, glucose absorption, blood pressure and gastrointestinal symptoms after Roux-en-Y gastric bypass
Author: Nguyen, N.
Debreceni, T.
Burgstad, C.
Neo, M.
Bellon, M.
Wishart, J.
Standfield, S.
Bartholomeusz, D.
Rayner, C.
Wittert, G.
Horowitz, M.
Citation: Obesity Surgery, 2016; 26(1):77-84
Publisher: Springer
Issue Date: 2016
ISSN: 0960-8923
1708-0428
Statement of
Responsibility: 
Nam Q. Nguyen, Tamara L. Debreceni, Carly M. Burgstad, Melissa Neo, Max Bellon, Judith M. Wishart, Scott Standfield, Dylan Bartholomeusz, Chris K. Rayner, Gary Wittert, and Michael Horowitz
Abstract: BACKGROUND: The aim was to determine the effects of fat and protein preloads on pouch emptying (PE), caecal arrival time (CAT), glucose absorption, blood glucose (BSL), gut hormones, haemodynamics and gastrointestinal (GI) symptoms in subjects who had undergone Roux-en-Y gastric bypass (RYGB) >12 months previously. METHODS: Ten RYGB subjects were studied on three occasions, in randomised order, receiving 200 ml preloads of either water, fat (30 ml olive oil) or whey protein (55 g), 30 min before a mixed meal. PE, CAT, BSL, plasma 3-O-methyl-D-glucopyranose (3-OMG), insulin, glucose-dependent insulinotropic polypeptide (GIP), glucagon-like peptide 1 (GLP-1) and glucagon, blood pressure (BP), heart rate (HR) and GI symptoms were assessed over 270 min. RESULTS: Although fat and protein preloads did not alter PE of either solids or liquids, the CAT of solids, but not liquids, was longer than that after the water preload (fat 68 ± 5 min and protein 71 ± 6 min vs. water 46 ± 5 min; P = 0.02). BSL elevated promptly after the meal on all days (P < 0.001), but after protein, the magnitude and integrated increases in the first 75 min were less than fat and water preloads (area under the curve (AUC(0-75 min)), 18.7 ± 18.2 vs. 107.2 ± 30.4 and 76.1 ± 19.3 mmol/L/min; P < 0.05). Compared to water preload, the protein and fat preloads were associated with greater increases in plasma insulin, GLP-1 and glucagon concentrations, a reduction in BP, and greater increases in HR, fullness, bloating and nausea. Plasma 3-OMG levels were lower after the protein than after the water and fat preloads (P < 0.001). CONCLUSIONS: Given its effects to attenuate post-prandial glycaemia, reduce intestinal glucose absorption and potentiate the "incretin response", without inducing more adverse post-prandial GI symptom, protein preload may prove clinically useful in RYGB patients and warrant further evaluation, particularly in those with type 2 diabetes (T2DM) and/or dumping syndrome.
Keywords: Protein; Glucose; Fat; Preload; Post-prandial hyperglycaemia; Carbohydrate absorption; Gastrointestinal hormones; Roux-en-Y gastric bypass
Rights: © Springer Science+Business Media New York 2015
RMID: 0030029218
DOI: 10.1007/s11695-015-1722-7
Appears in Collections:Medicine publications

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