58 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



metabolism above the level of the second day of fast, although the 

 values were somewhat increased by the food over those obtained for 

 all the factors during the fourth fasting day, which immediately pre- 

 ceded the taking of the milk and orange juice. 



Somewhat similar conditions exist in the next series of experiments 

 with the same subject S. A. B., January 28 to February 5, 1905. l 

 This consisted of a 5-day fasting experiment, followed by a 3-day food 

 experiment. (See table 9.) A mixed diet was used, consisting of modi- 

 fied milk, orange juice, a small quantity of apple, and a few graham 

 crackers. This diet was somewhat above maintenance in energy, 

 but small in nitrogen content. After 5 days of continuous fasting, the 

 effect of the amount of food taken was not sufficient to bring the metab- 



TABLE 9. S. A. B., January SB-February 5, 1905. (24-hour periods, 7 a. m. to 7 a. m.) 



Mixed diet (per day) : 



Amount, 1,671 grams; nitrogen, 6.37 grama; total energy, 2,133 calories. 

 Fuel value, 2,078 calories; from protein, 8 per cent; from fat, 65 per cent; 

 from carbohydrates, 27 per cent. 



olism up to the values obtained on the first 2 days of the fast. Nor 

 did the continued ingestion of the food materially alter the total 

 metabolism in any way. The results of this experiment are in striking 

 contrast to those obtained for A. L. L., on December 16 to 23, 1904 

 (see table 7, page 56), in which there was a continued increase in the 

 values obtained on the food days. The fuel value of the food used for 

 the experiment with A. L. L. was, however, about 25 per cent higher 

 than that given to S. A. B. If the results for the fifth day of the fast 

 are used as a base-line in this experiment with S. A. B., the metabolism 

 on the food days will show a positive increment for all 3 days, although 

 the increment on the second day is very small for both the oxygen 

 consumption and the heat production. Indeed, the food experiment 

 in this series seems to indicate simply a maintenance of the fasting 



'For the detailed results of this experiment, see Benedict, Carnegie Inst. Wash. Pub. No. 77, 1907, 

 experiments Nos. 73 and 74. 



