American Journal of Clinical Nutrition, Vol 59, 1386-1394, Copyright © 1994 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Decreased postprandial thermogenesis and fat oxidation but increased fullness after a high-fiber meal compared with a low-fiber meal

A Raben, NJ Christensen, J Madsen, JJ Holst and A Astrup
Research Department of Human Nutrition, Royal Veterinary and Agricultural University, Frederiksberg, Denmark.

The effect of a high-fiber (4.7 g/MJ) and an isoenergetic low-fiber (1.7 g/MJ) meal on 6-h postprandial thermogenesis, substrate metabolism, hormones, and satiety was investigated in 10 healthy, normal-weight male subjects. Diet-induced thermogenesis (DIT) was significantly reduced after the high-fiber meal (416.4 +/- 28.6 kJ/6 h) compared with the low-fiber meal (498.5 +/- 23.1 kJ/6 h; ANOVA: P < 0.0001), as was postprandial fat oxidation (P < 0.0001). The difference in DIT was correlated with the different palatability of the test meal (r = 0.89, P < 0.01). No differences were observed in plasma concentrations of glucose, insulin, norepinephrine, epinephrine, or gastrointestinal hormones, but C-peptide increased less (P < 0.05) and nonesterified fatty acids decreased more (P < 0.05) after the high- fiber meal. Finally, fullness was increased and desire to eat decreased after the high-fiber meal (P < 0.0001). In conclusion, a high-fiber meal decreased DIT and fat oxidation but increased fullness compared with a low-fiber meal.

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