Glucose and fatty acid kinetics in fasted rats: Effects of previous protein intake

Glucose and fatty acid turnover and oxidation were measured in 48 hr fasted adult rats who had been previously fed two isocaloric diets of 5% and 18% protein content for 29 days. Kinetics were investigated with the simultaneous primed constant infusions of 6-³H glucose, U-¹⁴C glucose and 1-¹³C palmitic acid. Plasma glucose concentration and glucose turnover were reduced while plasma fatty acid concentration and turnover were increased in the rats fed the 5% protein diet. The protein:carbohydrate ratio of a previous diet affects both glucose and lipid metabolism in adult rats who are fasted.