Abstract
Impaired function of the hormone insulin (insulin resistance) is a major feature of type 2 diabetes, a condition that is expected to afflict over 200 million people by early next century. Intensive investigation has failed to find a genetic basis for insulin resistance in the majority of cases. In this brief review the evidence that insulin resistance may be caused by excess nutrient supply will be presented. Both excess glucose and excess fat can cause insulin resistance in muscle and fat tissue, while excess fat can cause impaired suppression of endogenous glucose production. Each nutrient may impair insulin action by several mechanisms, at least one of which may be common to both.
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