title: Effects of long-term overfeeding on plasma lipoprotein levels in identical twins.
abstract: Twelve pairs of male monozygotic (MZ) twins (mean age +/- S.D.: 21 +/- 2 years) were subjected to an overfeeding protocol of 4.2 MJ (1000 kcal) above their pre-established individual daily energy needs, 6 days a week, over a period of 100 days. Body weight increased significantly (gain of 8.1 kg, P<0.001), as did fat mass (5.4 kg, P<0.001) after overfeeding. Plasma triacylglycerol (TG) levels significantly increased (P<0.05) without change in plasma cholesterol (CHOL). Plasma very-low-density-lipoprotein (VLDL)-TG, VLDL-Apoprotein (Apo) B, low-density-lipoprotein cholesterol (LDL-C) and LDL-Apo B (P</=0.05) rose, whereas high-density-lipoprotein cholesterol (HDL-C) levels fell (P<0.05) raising the CHOL/HDL-C ratio (20%) (P<0.001). Considerable individual differences occurred in plasma lipoprotein responses to overfeeding. However, these changes were not random; significant within-pair resemblance registered for the response of plasma CHOL, TG, VLDL-TG, VLDL-C, LDL-TG, HDL-C, HDL-Apo A-I, HDL2-C, HDL3-C to overfeeding (0.48</=ri</=0.85). Furthermore, a high within-pair resemblance was found for changes in ratios of CHOL/HDL-C (ri=0.86, P<0.0001) and HDL2-C/HDL3-C (ri=0.69, P<0.01). These results strongly suggest that the response of plasma lipoproteins to chronic energy surplus has a significant genetic component as does the detrimental effect of chronic caloric affluence on CHD risk.
authors.affiliation: Pennington Biomedical Research Center, Louisiana State University, 6400 Perkins Road, Baton Rouge, LA 70808, USA.
authors.forename: Margarita
authors.initials: M
authors.lastname: Terán-García
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Després
authors.forename: Charles
authors.initials: C
authors.lastname: Couillard
authors.forename: Angelo
authors.initials: A
authors.lastname: Tremblay
authors.forename: Claude
authors.initials: C
authors.lastname: Bouchard
mesh_terms: D000328:Adult; D001055:Apolipoproteins B / Q000097:blood*; D001823:Body Composition; D015992:Body Mass Index; D004041:Dietary Fats / Q000008:administration & dosage*; D002149:Energy Intake; D005500:Follow-Up Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D006949:Hyperlipidemias / Q000235:genetics / Q000503:physiopathology; D008075:Lipoproteins, HDL / Q000097:blood*; D008079:Lipoproteins, VLDL / Q000097:blood*; D008297:Male; D009765:Obesity / Q000235:genetics / Q000503:physiopathology; D011336:Probability; D012494:Sampling Studies; D012680:Sensitivity and Specificity; D014430:Twins, Monozygotic
chemical_list: D001055:Apolipoproteins B; D004041:Dietary Fats; D008075:Lipoproteins, HDL; D008079:Lipoproteins, VLDL