title: Dietary and 24-h fat oxidation in Asians and whites who differ in body composition.
abstract: BACKGROUND
  With the same BMI, age, and sex, Asians were reported to have a higher body fat percentage than whites.
  
  
  OBJECTIVE
  This study aimed to determine the difference in body composition and its effect on dietary and 24-h fat oxidation between Asians and whites when they were fed a diet that contained 30% of energy as fat.
  
  
  METHODS
  Seventeen Asians (8 men) were matched with 17 whites (8 men) for BMI, age, and sex. Physical activity was measured for 7 d with an accelerometer. During the last 3 d of the activity measurement, subjects were given a diet to maintain energy balances. Energy expenditure and substrate use were measured for 24 h in a respiration chamber. Dietary fat oxidation was determined from the percentage recovery of deuterium in the urine after a breakfast meal that contained deuterated palmitic acid. Body composition was calculated with a 3-compartment model from body mass, body volume (hydrodensitometry), and total body water (deuterium dilution).
  
  
  RESULTS
  Asians had 5% higher body fat than whites (28.1 ± 7.3% compared with 23.0 ± 6.9%, respectively; P = 0.03). The fat-free mass index tended to be lower in Asians than in whites (16.3 ± 1.6 compared with 17.0 ± 1.7 kg/m(2), respectively; P = 0.07). Dietary fat oxidation as a percentage of fat consumed was 11.7 ± 3.6% compared with 10.8 ± 4.5% (P = 0.50) for Asians and whites, respectively. In Asians and whites, the 24-h fat oxidation as a percentage of total energy expenditure was 17.7 ± 6.9% compared with 19.2 ± 5.1% (P = 0.63), respectively; carbohydrate oxidation was 68.0 ± 6.8% compared with 66.1 ± 5.1% (P = 0.51), respectively; and protein oxidation was 14.3 ± 2.2 compared with 14.7 ± 1.6% (P = 0.61), respectively.
  
  
  CONCLUSIONS
  Dietary and 24-h fat oxidation were not different between Asians and whites despite differences in body composition. This study was registered in the public trial registry at www.ccmo.nl as NL31217.068.10.
authors.affiliation: Department of Human Biology, NUTRIM-School for Nutrition Toxicology and Metabolism, Maastricht University Medical Center, Universiteit Single 50, P.O. Box 616, 6200MD Maastricht,Netherlands. siti.wulan@maastrichtuniversity.nl
authors.forename: Siti N
authors.initials: SN
authors.lastname: Wulan
authors.forename: Klaas R
authors.initials: KR
authors.lastname: Westerterp
authors.forename: Guy
authors.initials: G
authors.lastname: Plasqui
mesh_terms: D000273:Adipose Tissue; D000328:Adult; D001208:Asia; D001823:Body Composition; D001825:Body Fluid Compartments; D050260:Carbohydrate Metabolism; D004032:Diet; D004041:Dietary Fats / Q000378:metabolism*; D004734:Energy Metabolism; D005060:Europe; D005260:Female; D006801:Humans; D050356:Lipid Metabolism; D015227:Lipid Peroxidation; D008297:Male; D010084:Oxidation-Reduction; D050050:Protein Carbonylation; D055815:Young Adult
chemical_list: D004041:Dietary Fats