62 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



A series of experiments was carried out with D. W., January 10 

 to 14, 1906, which was similar in plan to those with H. R. D. and N. 

 M. P., except that the food experiment was continued for a second day. 

 The data are shown in table 13. The two fasting days gave results 

 which agree fairly well with each other. After the ingestion of a 



TABLE 13. D. W., January 10-14, 1906, (24-hour periods, 7 a. m. to 7 a. m.) 

 Mixed diet (per day) . -1 



Amount, 616 grams; nitrogen, 5.11 grams; total energy, 988 calories. 



Fuel value: Total, 943 calories; from protein, 14 percent; from fat, 20 per cent; 

 from carbohydrates, 66 per cent. 



Breakfast cereal and milk; eaten in three portions each day. 



mixed diet with a fuel value of only 943 calories, the metabolism on the 

 first day after fasting was very slightly increased hardly more, indeed, 

 than would be expected as the limit of error. On the second day, with 

 the same diet, the metabolism showed a very perceptible increase of 

 184 calories, a distinct indication of the influence of the ingestion of 

 food. The results of this experiment are not unlike those found in the 

 food experiments with A. L. L. the first 24-hour experiment dis- 

 cussedin which there was a continually increasing metabolism on the 

 days following fasting. In the former case, however, the fuel value 

 was sufficiently large to supply the daily requirements, while in this 

 experiment the fuel value of the food was less than half that of the body 

 needs. Inasmuch as this man was subsisting on an insufficient diet, 

 the experiment with D. W. can hardly be termed an experiment with 

 food, but is more properly classified as an experiment with partial 

 inanition. In this experiment, as in the others, every attempt was 

 made to secure uniformity in the activity. An examination of the 

 records of the physical observer for the second day and of the figures for 

 the total heat production show that the excess heat on this day was 

 given off during the night between 11 p. m. January 12 and 7 a. m. 

 January 13. This heat output can not, therefore, be considered as a 

 digestive function, for the subject reported a very wakeful night; the 

 records also show that he telephoned twice, although on the first day 

 he had not done this. It is thus probable that the increment on this 



