Acute effects of prior dietary fat ingestion on postprandial metabolic responses to protein and carbohydrate co-ingestion in overweight and obese men: A randomised crossover trial

Wilhelmsen, Andrew, Davies, Amanda, Mallinson, Joanne, Pabla, Pardeep, Jones, Robert, Palmer, Elliott A, Dunn, Warwick B ORCID: 0000-0001-6924-0027, Moran, Gordon W, Stephens, Francis B and Tsintzas, Kostas (2022) Acute effects of prior dietary fat ingestion on postprandial metabolic responses to protein and carbohydrate co-ingestion in overweight and obese men: A randomised crossover trial. CLINICAL NUTRITION, 41 (8). pp. 1623-1635.

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Official URL: http://dx.doi.org/10.1016/j.clnu.2022.06.022

Abstract

<h4>Background</h4>Obesity and insulin resistance are associated with an impaired sensitivity to anabolic stimuli such as dietary protein (anabolic resistance). Omega-3 polyunsaturated fatty acids (n-3 PUFA) may be protective against the deleterious effects of saturated fatty acids (SFA) on insulin resistance. However, the contribution of excess fat consumption to anabolic and insulin resistance and the interaction between SFA and n-3 PUFA is not well studied.<h4>Aim</h4>The primary aim of this study was to investigate the effects of an oral fat pre-load, with or without the partial substitution of SFA with fish oil (FO)-derived n-3 PUFA, on indices of insulin and anabolic sensitivity in response to subsequent dietary protein and carbohydrate (dextrose) co-ingestion.<h4>Methods</h4>Eight middle-aged males with overweight or obesity (52.8 ± 2.0 yr, BMI 31.8 ± 1.4 kg·m<sup>-2</sup>) ingested either an SFA, or isoenergetic SFA and FO emulsion (FO), or water/control (Con), 4 h prior to a bolus of milk protein and dextrose.<h4>Results</h4>Lipid ingestion (in particular FO) impaired the early postprandial uptake of branched chain amino acids (BCAA) into the skeletal muscle in response to protein and dextrose, and attenuated the peak glycaemic response, but was not accompanied by differences in whole body (Matsuda Index: Con: 4.66 ± 0.89, SFA: 5.10 ± 0.94 and FO: 4.07 ± 0.59) or peripheral (forearm glucose <sub>net</sub>AUC: Con: 521.7 ± 101.7; SFA: 470.2 ± 125.5 and FO: 495.3 ± 101.6 μmol·min<sup>-1</sup>·100 g lean mass·min [t = 240-420 min]) insulin sensitivity between visits. Postprandial whole body fat oxidation was affected by visit (P = 0.024) with elevated rates in SFA and FO, relative to Con (1.85 ± 0.55; 2.19 ± 0.21 and 0.65 ± 0.35 kJ·h<sup>-1</sup>·kg<sup>-1</sup> lean body mass, respectively), however muscle uptake of free fatty acids (FFA) was unaffected.<h4>Conclusion</h4>Oral lipid preloads, consisting of SFA and FO, impair the early postprandial BCAA uptake into skeletal muscle, which occurs independent of changes in insulin sensitivity.<h4>Clinical trial registry number</h4>ClinicalTrials.gov Identifier NCT03146286.

Item Type:	Article
Uncontrolled Keywords:	Dietary fat, Obesity, Anabolic sensitivity, Insulin resistance, Lipidomics
Divisions:	Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User:	Symplectic Admin
Date Deposited:	17 Oct 2022 14:21
Last Modified:	18 Jan 2023 20:36
DOI:	10.1016/j.clnu.2022.06.022
Open Access URL:	https://doi.org/10.1016/j.clnu.2022.06.022
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3165543