Differences in dietary-induced thermogenesis following the ingestion of various carbohydrates.

When the metabolic rate and respiratory quotient are measured up to 180 min after ingesting various monosaccharides, disaccharides and mixtures of monosaccharides no difference between men and women was found. The increase in metabolic rate was greatest when fructose was ingested. The respiratory quotient was greater after fructose ingestion compared with the other carbohydrates. Galactose, when ingested alone, had a significantly higher respiratory quotient than when accompanied by glucose.