Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2685493 | e-SPEN, the European e-Journal of Clinical Nutrition and Metabolism | 2008 | 7 Pages |
SummaryObjectiveThe objective of the present study was to determine the degree to which ingested isoleucine modified the glucose, insulin and glucagon responses to ingested glucose.DesignNine healthy subjects were studied on 4 separate occasions. Plasma isoleucine, glucose, insulin, glucagon, and total alpha amino nitrogen were measured at various times during a 2.5 h period after ingestion of isoleucine (1 mmol/kg lean body mass), 25 g glucose, isoleucine + glucose, or water alone, given in random order.ResultsFollowing isoleucine ingestion, the isoleucine concentration increased ∼24-fold. The glucose decreased, the insulin remained unchanged. When isoleucine was ingested with glucose the increase in isoleucine was less, insulin increased, and the maximum concentration was 43% higher than that following ingestion of glucose alone. The glucose concentration increase was less and it decreased more rapidly following isoleucine + glucose, compared to glucose alone. Consequently, the glucose area response was markedly attenuated (61%). Isoleucine had little effect on the glucagon concentration.ConclusionIsoleucine per se does not stimulate a rise in insulin and has little effect on glucagon but does decrease the glucose concentration. It synergizes with ingested glucose in stimulating insulin secretion and in decreasing the glucose response.