High-level medium-chain triglyceride feeding and energy expenditure in normal-weight women.
The objective of this study was to assess how short-term feeding of high levels of dietary medium-chain triglyceride (MCT) affect energy expenditure and postprandial substrate oxidation rates in normal-weight, premenopausal women. Eight healthy women were fed both a MCT-rich and an isocaloric long-chain triglyceride (LCT)-rich diet for two 1-week periods separated by a minimum of 21 days. The energy intake in each diet was 45% carbohydrates, 40% fat, and 15% protein. The 2 diets had either 60.81% or 1.11% of total fat energy from MCT with the remaining fat energy intake from LCT. On days 1 and 7 of each diet, resting metabolic rate and postprandial energy expenditure (EE) were measured by indirect calorimetry with a ventilated hood. Results indicated on days 1 and 7, there were no significant differences between diets for resting metabolic rate or mean postprandial EE. On both days 1 and 7, fat oxidation for the MCT-rich diet was significantly greater (0.0001 </= p </= 0.04) than that for the LCT-rich diet at different time points across the 5.5 h postprandial period. In conclusion, for premenopausal, normal-weight women consuming a diet with 25% of the energy content from MCT, there were no changes in resting metabolic rate, transient increases in postprandial energy expenditure, and significant increases in postprandial fat oxidation.
Alexandrou
Elena
E
School of Human Kinetics and Recreation, Memorial University, St. John's, NL A1C 5S7, Canada.
Herzberg
Gene R
GR
White
Matthew D
MD
D000328:Adult; D000704:Analysis of Variance; D001481:Basal Metabolism / Q000187:drug effects; D015992:Body Mass Index; D001835:Body Weight / Q000187:drug effects*; D002153:Calorimetry, Indirect / Q000379:methods; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000494:pharmacology; D004041:Dietary Fats / Q000008:administration & dosage / Q000494:pharmacology*; D004044:Dietary Proteins / Q000008:administration & dosage / Q000494:pharmacology; D002149:Energy Intake / Q000187:drug effects; D004734:Energy Metabolism / Q000187:drug effects*; D005260:Female; D006801:Humans; D010101:Oxygen Consumption / Q000187:drug effects; D019518:Postprandial Period; D011659:Pulmonary Gas Exchange / Q000187:drug effects; D013997:Time Factors; D014280:Triglycerides / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology*
D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004044:Dietary Proteins; D014280:Triglycerides