title: Fasting triacylglycerol status, but not polyunsaturated/saturated fatty acid ratio, influences the postprandial response to a series of oral fat tolerance tests.
abstract: Elevated postprandial lipemia is emerging as a risk factor for obesity-related chronic diseases, such as type 2 diabetes and cardiovascular disease, and is associated with alterations in several metabolic biomarkers of disease. Our goal was to examine the effects of specific polyunsaturated/saturated fatty acid (P/S) ratios on postprandial triacylglycerol (TAG) concentrations and metabolic biomarkers in men with different fasting TAG concentrations through a series of oral fat tolerance tests (OFTT) consisting solely of emulsified lipid. Otherwise healthy men with high (>1.69 mmol/L) fasting TAG (HTAG, n=8) and low fasting TAG (LTAG, n=8) underwent three OFTTs with specific P/S ratios of 0.2, 1.0 and 2.0, respectively, and a total lipid load of 1 g/kg subject body mass. All subjects received each treatment separated by at least 1 week. Postprandial plasma TAG fatty acid composition reflected fatty acids present in the OFTT. All other metabolic responses were independent of the P/S ratio ingested. An accelerated increase in postprandial TAGs was observed in HTAG compared to LTAG. Interleukin (IL)-6 and soluble intercellular adhesion molecule (sICAM)-1 were significantly elevated in HTAG at baseline (P<.05). IL-6 increased significantly following each OFTT (P<.05) in both groups. Postprandial glucose and CRP were significantly exaggerated (P<.05) in HTAG. Overall, HTAG subjects had an accelerated postprandial TAG response and increased concentrations of several inflammatory markers following an OFTT, in the absence of an insulin response. However, P/S ratio had no influence on postprandial lipid and inflammatory parameters.
authors.affiliation: Department of Human Health and Nutritional Sciences, University of Guelph, ON, Canada.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Dekker
authors.forename: Amanda J
authors.initials: AJ
authors.lastname: Wright
authors.forename: Vera C
authors.initials: VC
authors.lastname: Mazurak
authors.forename: Alejandro G
authors.initials: AG
authors.lastname: Marangoni
authors.forename: James W E
authors.initials: JW
authors.lastname: Rush
authors.forename: Terry E
authors.initials: TE
authors.lastname: Graham
authors.forename: Lindsay E
authors.initials: LE
authors.lastname: Robinson
mesh_terms: D015415:Biomarkers; D001786:Blood Glucose / Q000032:analysis; D015992:Body Mass Index; D002097:C-Reactive Protein / Q000378:metabolism; D019963:Clinical Chemistry Tests; D005215:Fasting / Q000097:blood*; D005227:Fatty Acids / Q000097:blood*; D005231:Fatty Acids, Unsaturated / Q000097:blood*; D006801:Humans; D006949:Hyperlipidemias; D007328:Insulin / Q000097:blood; D018799:Intercellular Adhesion Molecule-1 / Q000097:blood; D015850:Interleukin-6 / Q000097:blood; D008055:Lipids / Q000008:administration & dosage*; D008297:Male; D024821:Metabolic Syndrome / Q000175:diagnosis; D008875:Middle Aged; D017395:Plasminogen Activator Inhibitor 1 / Q000097:blood / Q000378:metabolism; D019518:Postprandial Period / Q000502:physiology*; D012307:Risk Factors; D013997:Time Factors; D014280:Triglycerides / Q000097:blood*; D019010:Vascular Cell Adhesion Molecule-1 / Q000097:blood
chemical_list: D015415:Biomarkers; D001786:Blood Glucose; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D007328:Insulin; D015850:Interleukin-6; D008055:Lipids; D017395:Plasminogen Activator Inhibitor 1; D014280:Triglycerides; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1; D002097:C-Reactive Protein