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https://hdl.handle.net/2440/122696
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Type: | Journal article |
Title: | Effects of duodenal infusion of lauric acid and L-tryptophan, alone and combined, on fasting glucose, insulin and glucagon in healthy men |
Author: | McVeay, C. Fitzgerald, P.C.E. Horowitz, M. Feinle-Bisset, C. |
Citation: | Nutrients, 2019; 11(11):2697-1-2697-9 |
Publisher: | MDPI |
Issue Date: | 2019 |
ISSN: | 2072-6643 2072-6643 |
Statement of Responsibility: | Christina McVeay, Penelope C. E. Fitzgerald, Michael Horowitz and Christine Feinle-Bisset |
Abstract: | The fatty acid, lauric acid ('C12'), and the amino acid, tryptophan ('Trp'), when given intraduodenally at loads that individually do not affect energy intake, have recently been shown to stimulate plasma cholecystokinin, suppress ghrelin and reduce energy intake much more markedly when combined. Both fatty acids and amino acids stimulate insulin secretion by distinct mechanisms; fatty acids enhance glucose-stimulated insulin secretion, while amino acids may have a direct effect on pancreatic β cells. Therefore, it is possible that, by combining these nutrients, their effects to lower blood glucose may be enhanced. We have investigated the potential for the combination of C12 and Trp to have additive effects to reduce blood glucose. To address this question, plasma concentrations of glucose, insulin and glucagon were measured in 16 healthy, lean males during duodenal infusions of saline (control), C12 (0.3 kcal/min), Trp (0.1 kcal/min), or C12+Trp (0.4 kcal/min), for 90 min. Both C12 and C12+Trp moderately reduced plasma glucose compared with control (p < 0.05). C12+Trp, but not C12 or Trp, stimulated insulin and increased the insulin-to-glucose ratio (p < 0.05). There was no effect on plasma glucagon. In conclusion, combined intraduodenal administration of C12 and Trp reduced fasting glucose in healthy men, and this decrease was driven primarily by C12. The effects of these nutrients on postprandial blood glucose and elevated fasting blood glucose in type 2 diabetes warrant evaluation. |
Keywords: | amino acid; fatty acid; glycaemic control; blood glucose; humans |
Description: | Published: 7 November 2019 |
Rights: | © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
DOI: | 10.3390/nu11112697 |
Grant ID: | http://purl.org/au-research/grants/nhmrc/1078471 http://purl.org/au-research/grants/nhmrc/1103020 http://purl.org/au-research/grants/nhmrc/GNT1158296 |
Published version: | http://dx.doi.org/10.3390/nu11112697 |
Appears in Collections: | Aurora harvest 8 Medicine publications |
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