American Journal of Clinical Nutrition, Vol 63, 946-949, Copyright © 1996 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Relation between dietary vitamin intake and resistance to insulin- mediated glucose disposal in healthy volunteers [published erratum appears in Am J Clin Nutr 1996 Sep;64(3):386]

F Facchini, AM Coulston and GM Reaven
Department of Medicine, Stanford University School of Medicine, CA, USA.

The relation between the self-reported intake of various dietary constituents and insulin-mediated glucose disposal was evaluated in 52 healthy volunteers. Insulin-mediated glucose uptake was independently associated with degree of obesity (inversely) and estimates of level of physical activity (directly). An independent relation between increased intake of vitamin A and insulin action was shown, ie, the greater the intake of vitamin A, the more effective was insulin in stimulating glucose disposal. However, there was no independent relation noted between insulin-mediated glucose disposal and estimates of the intake of carbohydrate, protein, amount or kind of fat, fiber, or vitamins C and E. Furthermore, the 20 individuals with estimates of vitamin A consumption > 10 000 IU/d had significantly lower plasma glucose (P < 0.01) and insulin (P < 0.05) responses to oral glucose, and insulin- mediated glucose disposal values that were higher (P < 0.005) than those of the 20 individuals whose estimated vitamin A intake was < 8000 IU/d. These results suggest that vitamin A intake, but not intakes of vitamin C and E, fiber, fat, or carbohydrate is associated with enhanced insulin-mediated glucose disposal.

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