INGESTION OF FAT. 



259 



but also supplied a considerable proportion of the energy in the form 

 of fat. It was hoped that the subjects of the experiments would be 

 able to take large amounts of butter with the potato chips, but unfor- 

 tunately this was possible in only a few experiments. 



E. H. B., March 19, 1907. The subject of the first experiment with 

 this diet was able to eat only 83 grams of butter with 233 grams of 

 potato chips. The basal value selected for comparison is an average 

 of values obtained in two experiments made a week or 10 days previous 

 to the experiment with butter. The results of the experiment are 

 given in table 191. Notable increases were obtained in the carbon- 

 dioxide production for the three 2-hour periods after the taking of the 

 food ; considerable increments were also found for oxygen consumption 

 and heat production. It may therefore be considered that the fat diet 

 of butter and potato chips had a decided influence upon the metabolism. 

 Although 22 per cent of the energy in the diet was derived from carbo- 

 hydrates, it is hardly probable that the amount present played a very 

 important part in the metabolism. 



TABLE 191. E. H. B., March 19, 1907. Sitting. (2-hour periods.) 



Butter and potato chips: 



Amounts, 83 grains butter, 233 grams potato chips; nitrogen, 2.18 grams; total energy, 



1,943 cals. 

 Fuel value: Total, 1,924 cals.; from protein, 3 p. ct. ; from fat, 75 p. ct.; from carbohydrates, 



22 p. ct. 

 Basal values (March 7 and 13, 1907) : COo, 58 grams; Oa, 48 grams; heat, 179 cals. 



'Subject ate food in about 30 minutes. 



-Heat eliminated corrected for change in body-weight, but not for change in body-temperature. 



A. H. M., March 25, 1907. The largest amount of butter used in 

 this series of experiments was taken by A. H. M., who was able to eat 

 243 grams with 211 grams of potato chips. The available energy of 

 the food was over 3,000 calories. Of this energy, 85 per cent was 

 derived from fat and but 13 per cent from carbohydrates. The basal 

 value was obtained in two experiments two or three weeks previous 

 to the experiment with butter. Positive increments of considerable 

 magnitude were observed in the three factors of the metabolism with 

 no indication of a return to the basal value at the end of the fourth 



