66 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



TABLE 18. Comparison of energy computed from body material katabolized, with heat pro- 

 duction as measured in fatting experiment with A. H. M., December 3-5, 1906. 



A reference to tables 15 and 16 shows that there was the usual rise in 

 the nitrogen excretion on the second day of fasting. Of particular 

 interest is the fact that the amount of glycogen katabolized, as shown 

 in table 17, was 123.1 grams on the first day and 47.6 grams on the 

 second day, this agreeing very well with the averages found for the 

 other fasting subjects, namely, 110 grams on the first day and 40.3 

 grams on the second day. 1 



It is thus clear that the tendency to store glycogen shown in the experi- 

 ment of November 21 to 23, 1905, was not at all characteristic of this 

 subject. 2 This fact is further emphasized by the data obtained in the 

 1-day food experiment with an exclusively fat diet which followed the 

 2 days of fast, these results showing a further katabolism of glycogen 

 amounting to 47.3 grams. Apparently the subject had by no means 

 exhausted his glycogen supply at the end of the 2 days of fasting, even 

 with a total output of 170.7 grams for the 2 fasting days. 



Although it is contended that substances other than creatinine 

 affect the Jaffe color reaction and accordingly the determinations of 

 creatine in fasting urine can not be absolutely relied upon, 3 it should 

 be noted that in this experiment, as in the earlier fasting experiments, 

 there was evidence of preformed creatine in the urine. As a matter 

 of fact, the 0.02 gram of creatine excreted on the second day of fast 

 (see table 15) is much less than was observed in any of the other fasting 

 experiments, the tendency in the earlier experiments being for this 

 factor to increase somewhat on the second dav rather than to decrease 



'Benedict, Carnegie Inst. Wash. Pub. No. 77, 1907, p. 464, table 228. 



2 /6?'d., p. 222 et seq. 



Graham and Poulton, Proc. Royal Soc., ser. B, 1914, 87, p. 205. 



