Comparison of the acute response to meals enriched with cis- or trans-fatty acids on glucose and lipids in overweight individuals with differing FABP2 genotypes.
Trans-fatty acids have been implicated as a risk factor for cardiovascular disease and diabetes. In addition, a polymorphism at codon 54 (Ala54Thr) in the fatty acid-binding protein 2 (FABP2) gene has been suggested to modify an interaction between dietary fat and insulin sensitivity. We examined the postprandial metabolic profiles after meals enriched with C18:1trans- relative to a similar meal with C18:1cis-fatty acid in individuals who were either FABP2 Ala54 homozygotes or Thr54 carriers. Moderately overweight men and women ate 2 breakfast test meals, separated by 1 week, each providing 40% of their daily energy requirement and containing 50% of energy as fat. In one meal, 10% of energy was from C18:1trans, and in the other meal, the C18:1trans was replaced with C18:1cis. Metabolic parameters were assessed during an 8-hour period. Insulin and C-peptide levels increased more after the C18:1trans meal, and this was associated with a greater fall in free fatty acids. Postprandial glucose levels and oxidation of fatty acids and carbohydrate were not different between the 2 test meals. The Thr54 allele for FABP2 increased the rise in postprandial glucose but not triacylglycerols. Fractional triacylglycerol synthetic rates were higher after consumption of the C18:1trans meal relative to the C18:1cis meal only in Thr54 carriers. These data show that a single meal enriched with C18:1trans-fatty acids can significantly increase insulin resistance, and that in the presence of the FABP2 Thr54 allele, may contribute to increased partitioning of glucose to triacylglycerols and insulin resistance.
Lefevre
Michael
M
Pennington Biomedical Research Center, 6400 Perkins Rd, Baton Rouge, LA 70808, USA. lefevrm@pbrc.edu
Lovejoy
Jennifer C
JC
Smith
Steven R
SR
Delany
James P
JP
Champagne
Catherine
C
Most
Marlene M
MM
Denkins
Yvonne
Y
de Jonge
Lilian
L
Rood
Jennifer
J
Bray
George A
GA
D000328:Adult; D001786:Blood Glucose / Q000032:analysis*; D002096:C-Peptide / Q000032:analysis; D004041:Dietary Fats / Q000008:administration & dosage*; D050556:Fatty Acid-Binding Proteins / Q000235:genetics*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D005838:Genotype; D006801:Humans; D007328:Insulin / Q000097:blood; D008055:Lipids / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D019518:Postprandial Period; D014280:Triglycerides / Q000097:blood
D001786:Blood Glucose; D002096:C-Peptide; D004041:Dietary Fats; C493404:FABP2 protein, human; D050556:Fatty Acid-Binding Proteins; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D008055:Lipids; D014280:Triglycerides