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The increase in, feeding that occurs following injections of insulin has been characterized as an emergency response to a dramatic disruption in metabolism. The possibility that this eating is under homeostatic controls similar to those operating in ad libitum conditions was studied by examining the ability of rats to regulate their caloric intake following insulin injections, a response they are capable of under natural conditions. Rats were maintained on diets of different caloric densities, and caloric intakes following insulin administration were recorded. Additionally, levels of plasma metabolic fuels, liver glycogen, and stomach contents were measured following saline and insulin injections.