Isomalt (Palatinit) an equimolar mixture of alpha-D-glucopyranosido-1,6-sorbitol and alpha-D-glucopyranosido-1,6-mannitol, was compared to sucrose in a prospective double-blind controlled crossover study. The acute effects of oral ingestion of 30-g loads of isomalt or sucrose on plasma glucose, insulin, free fatty acids (FFA), lactic acid, and carbohydrate (CHO) and lipid oxidation were studied over six hours by means of continuous indirect calorimetry in ten healthy normal-weight subjects. Unlike sucrose, whose ingestion was followed by significant changes in plasma glucose, insulin, and lactic acid during the first 60 minutes of the test, no significant changes in these parameters were observed following the administration of isomalt. The increase in CHO oxidation occurring between 30 and 150 minutes was significantly lower (P less than 0.01) following isomalt than after sucrose. Conversely, the decrease in lipid oxidation was significantly less (P less than 0.01) after isomalt in comparison to sucrose. It is concluded that the rise in CHO oxidation and in plasma glucose and insulin levels is markedly reduced when sucrose is replaced by an equal weight of isomalt. In contrast to other sugar substitutes, no increase in plasma lactic acid was observed after isomalt administration.
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