title: Differential response to low-fat diet between low and normal HDL-cholesterol subjects.
abstract: Heart attacks frequently occur in normolipidemic subjects with low concentration of high density lipoproteins (</=35 mg/dL). A low-fat diet is generally recommended to patients with coronary heart disease. A low-fat diet decreases both low density (LDL) and high density lipoproteins (HDL). We have shown that on an Average American Diet, subjects with different HDL-cholesterol (HDL-C) levels have different HDL subpopulation profiles. In low HDL-C subjects (</=35 mg/dL), the apoA-I-only subpopulation alpha(1) is significantly decreased compared to individuals with normal HDL-C levels (>35 mg/dL). We hypothesized that as subjects with low HDL-C already have low HDL concentrations, the major decrease of HDL-C will occur in subjects with normal HDL-C when a low-fat diet is consumed. Normolipidemic male subjects consumed three diets differing in total fat and saturated fat composition (AAD: 37%, Step-1: 28%, Step-2: 24% total fat) for 6 weeks in a three-period double-blind randomized crossover design. Plasma lipids and apolipoproteins were determined and changes in distribution of HDL subpopulations were evaluated. As a result of a low-fat diet, low HDL-C individuals slightly decreased their HDL-C, but substantially decreased their LDL-C resulting in a significant improvement in the LDL-C/HDL-C ratio. However, subjects with normal HDL-C levels decreased both their LDL-C and HDL-C resulting in an unchanged LDL-C/HDL-C ratio. We also observed significant differences in response to low-fat diets in HDL-C and alpha(1) concentrations between low and normal HDL-C subjects. In the normal HDL-C group, consumption of a low-fat diet also resulted in redistribution of apoA-I-containing HDL subpopulations, indicated by a decrease in the large apoA-I-only alpha(1) subpopulation. These data demonstrate that male subjects with low HDL-C respond to a low-fat diet differently than individuals with normal HDL-C.
authors.affiliation: Division of Lipoprotein Metabolism, Department of Physiology, Louisiana State University Medical Center, New Orleans, LA 70112, USA.
authors.forename: B
authors.initials: B
authors.lastname: Asztalos
authors.forename: M
authors.initials: M
authors.lastname: Lefevre
authors.forename: L
authors.initials: L
authors.lastname: Wong
authors.forename: T A
authors.initials: TA
authors.lastname: Foster
authors.forename: R
authors.initials: R
authors.lastname: Tulley
authors.forename: M
authors.initials: M
authors.lastname: Windhauser
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: P S
authors.initials: PS
authors.lastname: Roheim
mesh_terms: D000328:Adult; D000368:Aged; D016632:Apolipoprotein A-I / Q000097:blood; D016022:Case-Control Studies; D008076:Cholesterol, HDL / Q000097:blood*; D008078:Cholesterol, LDL / Q000097:blood*; D018592:Cross-Over Studies; D004041:Dietary Fats / Q000008:administration & dosage*; D004311:Double-Blind Method; D006801:Humans; D008875:Middle Aged; D010919:Placebos
chemical_list: D016632:Apolipoprotein A-I; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D004041:Dietary Fats; D010919:Placebos