104 



METABOLISM AND NUTRITION 



C. METABOLISM AFTER INGESTION OF FAT 



If an animal be given as much fat as he uses from his own body in fasting, 

 the latter is entirely replaced by the fat in the food. This will appear from the 

 following observations on the dog (Voit) : 



When the supply of fat is considerably greater than the amount of fat 

 destroyed in starvation, its metabolism is increased. 



B 



At the same time the total metabolism becomes greater ; in No. 1, table B, 

 it amounts to 1,209 CaL, in No. 4, to 1,780 Cal. The increase is forty per 

 cent. Quite similar results have been obtained in similar experiments by 

 Rubner. 



The following table contains a summary of experiments by Pettenkoffer 

 and Voit on the total metabolism after feeding meat and fat: 



We have here two series of experiments on the same animal, the one with 

 17, the other with 51 g. N", and with varying quantities of fat in each case. 



