INGESTION OF FAT. 251 



INGESTION OF FAT. 



While it was relatively easy in this research to obtain subjects that 

 could eat large quantities of protein and especially of carbohydrates, 

 it was difficult to obtain those who could take large amounts of pure 

 or approximately pure fat. In only one experiment, therefore, was an 

 attempt made to give olive oil, this being in the form of a mayonnaise 

 dressing. The results of the experiment have been reported in consider- 

 able detail in a previous section (see pages 63 et seq.}. The earliest 

 experiments with a predominatingly fat diet were made with cream, 

 which was palatable and could be taken with relative ease. It was 

 not, however, a pure fat, as it contained measurable amounts of protein 

 and lactose. Another diet emploj^ed was butter and potato chips. 

 This again was not a pure fat diet, as the potato chips, which were 

 used more particularly as a vehicle for the butter, contained a certain 

 amount of starch in combination with a considerable amount of fat. 

 Aside from the single experiment with mayonnaise, we were obliged 

 to content ourselves with these two imperfect fat diets. 



STATISTICS OF EXPERIMENTS. 



The experiments with a fat diet included 1 experiment with olive 

 oil taken in mayonnaise, 7 experiments with cream, and 7 experiments 

 with butter and potato chips. The metabolism was determined in all 

 cases with the respiration calorimeter. The experiments in 1906 and 

 1907 were made in Middletown (see tables 184 to 186 and 191 to 194), 

 while those in 1910 were carried out with the chair calorimeter in 

 Boston (see tables 187 to 190 and 195 to 197). In the Middletown 

 experiments the basal values used were obtained on some other than 

 the experimental day, and the measurements were made in 2-hour 

 periods. In the Boston experiments the basal values were obtained 

 on the same day, immediately preceding the experiments with a fat 

 diet, and the measurements were made in 1-hour periods. Data not 

 included in the tables or discussion of the experiments are given in 

 the following paragraphs: 



A. H. M., 7 a. m., December 3, to 7 a. m., December 6, 1906. Night before 

 experiment was spent in calorimeter chamber; slept most of time; but little 

 restlessness. At beginning of first fasting day, urinated, dressed, and assisted 

 in weighing himself, then put bedding away and sat down; body-weight, 

 65.8 kilograms. Between 7 h 24 m a. m. and Il h 03 m p. m. urinated 3 times, went 

 to food aperture 8 times, took 3 strength tests, and drank water twice (total 

 amount, 1 15 grams) ; slept sitting in chair about half hour in afternoon. Aside 

 from some further slight activity, sat in chair quietly reading, writing, or idle 

 until going to bed at Il h 03 m p. m. Awoke at 4 a. m., December 4; did not 

 sleep soundly afterward. 



At 7 a. rn., December 4. rose, urinated, and dressed, then weighed himself; 

 body- weight. 64.6 kilograms. Activity during second fasting day somewhat 



