Abstract
The mechanisms by which fat feeding suppresses the hyperphagia of diabetic rats were examined. Rats that were allowed to consume a small amount (1.5 ml) of corn oil decreased subsequent food intake within 6 hr after ingesting. Diabetic rats decreased food intake much more than normal rats. Similar results were obtained when oil was given intragastrically. Analysis of blood samples revealed that diabetic rats showed greater increases in plasma ketones and triglycerides and smaller increases in plasma glycerol than normal rats following consumption of 1.5 ml corn oil. This difference between diabetic and normal rats appeared when rats were allowed to eat after oil ingestion as well as when they were fasted. Brief periods of food deprivation (2.5–4.5 hr) substantially increased plasma ketones and glycerol and decreased plasma triglycerides in both diabetic and normal rats. The results indicate that diabetic rats decrease food intake more than normal rats after fat feeding because they oxidize more of the ingested fat.
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