The effects of diet on the altered insulin secretory responses of islets of Langerhans of pregnant rats have been investigated. The daily food intake of pregnant rats was found to exceed that of control non-pregnant rats by 20% on average. Depriving pregnant rats of this additional food resulted in an alteration in the pattern of insulin secretion seen in pregnancy, such that the sensitivity to stimulation by low glucose concentrations was abolished. The contribution made by different components of the diet to the secretory response in pregnancy was investigated. When additional carbohydrate, though not protein, was fed to pregnant rats on a restricted food intake, the sensitivity of the islets to glucose stimulation was restored. It was concluded that the quantity and in particular the carbohydrate content of food eaten by pregnant rats exerts an important influence on the changes in insulin secretion in pregnancy.
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