Long-term, intermittent, insulin-induced hypoglycemia produces marked obesity without hyperphagia or insulin resistance: a model for weight gain with intensive insulin therapy

Ewan C McNay, Jennifer A Teske, Catherine M Kotz, Ambrose Dunn-Meynell, Barry E Levin, Rory J McCrimmon, Robert S Sherwin

    Research output: Contribution to journalArticle

    23 Citations (Scopus)

    Abstract

    A major side effect of insulin treatment of diabetes is weight gain, which limits patient compliance and may pose additional health risks. Although the mechanisms responsible for this weight gain are poorly understood, it has been suggested that there may be a link to the incidence of recurrent episodes of hypoglycemia. Here we present a rodent model of marked weight gain associated with weekly insulin-induced hypoglycemic episodes in the absence of diabetes. Insulin treatment caused a significant increase in both body weight and fat mass, accompanied by reduced motor activity, lowered thermogenesis in response to a cold challenge, and reduced brown fat uncoupling protein mRNA. However, there was no effect of insulin treatment on total food intake nor on hypothalamic neuropeptide Y or proopiomelanocortin mRNA expression, and insulin-treated animals did not become insulin-resistant. Our results suggest that repeated iatrogenic hypoglycemia leads to weight gain, and that such weight gain is associated with a multifaceted deficit in metabolic regulation rather than to a chronic increase in caloric intake.
    Original languageEnglish
    Pages (from-to)E131-E138
    Number of pages8
    JournalAmerican Journal of Physiology, Endocrinology and Metabolism
    Volume304
    Issue number2
    DOIs
    Publication statusPublished - 15 Jan 2013

    Keywords

    • obesity
    • diabetes
    • insulin
    • hypoglycemia

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