American Journal of Clinical Nutrition, Vol 49, 1155-1163, Copyright © 1989 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Fructose-induced in vivo insulin resistance and elevated plasma triglyceride levels in rats

AW Thorburn, LH Storlien, AB Jenkins, S Khouri and EW Kraegen
Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW, Australia.

Insulin action was assessed by using the hyperinsulinemic (approximately 800 pmol/L) euglycemic clamp in rats fed equal amounts of glucose or fructose (35% of calories) for 4 wk. The glucose infusion rate required to maintain euglycemia was decreased in fructose-fed animals (14.6 +/- 1.4 vs 21.8 +/- 1.1 for glucose-fed rats, p less than 0.001) with this whole-body effect contributed to equally by an impairment in hepatic insulin action and a reduction in peripheral glucose disposal in a range of tissues. There was no difference in basal glucose turnover, energy expenditure, or postprandial blood glucose and insulin responses to the diets. In the fructose-fed rats there was an increase in fasting triglyceride levels by 2 wk. Euglycemic clamp glucose disposal correlated positively and clamp hepatic glucose output correlated negatively with fasting triglyceride levels. In summary, fructose but not glucose feeding led to impaired insulin action in both the liver and peripheral tissues, effects that may depend on antecedent circulating triglyceride levels.

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