UNDEENUT'RITION 



13 



soon began another fast lasting one hundred and four days (Howe and 

 Hawk, 1911). 



The main facts regarding the glycogen and fat combustion corne from 

 the respiratory exchange, while those regarding the protein metabolism 

 come from urinary examination. Many studies have been made on the 

 nitrogen partition of the urine in starvation ; the results in Levanzin's fast 

 are given in Table 6, which summarizes the results obtained. 



TABLE 6 

 PARTITION OF NITROGEN EXCRETED IN URINE IN FASTING MAN 



(Table from Benedict.) 



In protein starvation, the protein metabolism varies with the nature 

 of the food taken. If only carbohydrate is taken, the nitrogen output 

 falls to a low figure; with a fat ration, the nitrogen output is higher 



