Effects of long-term overfeeding on plasma lipoprotein levels in identical twins

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 less than or equal to 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 less than or equal to r(i) less than or equal to 0.85). Furthermore, a high within-pair resemblance was found for changes in ratios of CHOL/HDL-C (r(i) = 0.86, P < 0.0001) and HDL2-C/HDL3-C (r(i) = 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. (C) 2004 Elsevier Ireland Ltd. All rights reserved.