Oxidative and nonoxidative macronutrient disposal in lean and obese men after mixed meals.

Published

Journal Article

Oxidative and nonoxidative macronutrient disposal rates were measured in lean and obese males randomly fed mixed meals containing 0, 33, 67, 100, and 134 kJ/kg fat-free mass (0, 8, 16, 24, and 32 kcal/kg). Body composition, preprandial and postprandial energy expenditure, and macronutrient concentrations in the extracellular space were measured. Relationships among carbohydrate, fat, and protein disposal rates; body weight; and body composition were examined. Oxidative and nonoxidative disposals of macronutrients were not different between the lean and obese groups. Glucose was preferentially oxidized and fat was preferentially stored after nutrient ingestion. Macronutrient storage increased linearly with caloric intake. Oxidative and nonoxidative macronutrient disposals were completed within 8 h after ingesting the meals. Serum insulin concentrations rose to 3000-6000 pmol/L in two obese men after their two largest meals. Eight hours after nutrient ingestion, concentrations of macronutrient substrates, metabolic products, and insulin were indistinguishable from preprandial values.

Full Text

Duke Authors

Cited Authors

  • Owen, OE; Mozzoli, MA; Smalley, KJ; Kavle, EC; D'Alessio, DA

Published Date

  • March 1992

Published In

Volume / Issue

  • 55 / 3

Start / End Page

  • 630 - 636

PubMed ID

  • 1550035

Pubmed Central ID

  • 1550035

International Standard Serial Number (ISSN)

  • 0002-9165

Digital Object Identifier (DOI)

  • 10.1093/ajcn/55.3.630

Language

  • eng

Conference Location

  • United States