310 



FOOD INGESTION AND ENERGY TRANSFORMATIONS. 



MIXED DIET. 



While the study of specific food materials is of abstract physiological 

 value, especially those containing but a single nutrient like the sugars 

 in our study of the carbohydrates, nevertheless the most practical 

 interest lies in the influence of a mixed diet upon the basal metabolism. 

 We have for consideration in this connection the results of 15 experi- 

 ments in which the metabolism was studied after a mixed diet. Of 

 these, 13 were calorimeter experiments and 2 were respiration experi- 

 ments. The composition of the diet used in these 15 experiments is 

 given in table 235. Additional evidence as to the influence of a mixed 

 diet upon the metabolism is also given in an abstract of four calo- 

 rimeter experiments, previously published, which followed several days 

 of fasting. 



TABLE 235. Percentage composition of mixed diets used in experiments. 



'Computed. 



2 Diet on this day also included sugar, for which the composition is, carbohydrate, 100 p. ct. 

 and fuel value, 3.960 cals. per gram. 



*For composition of black bread used in diet of this day, see table 50, page 124. Sugar in the 

 diet is not included in the composition here given. 



CALORIMETER EXPERIMENTS. 



In our earlier investigations with the respiration calorimeter in 

 Middletown practically all of the experiments following a 2-days' fasting 

 experiment were with mixed diet. These have already been considered 

 in a previous section of this report, in which the metabolism during 

 fast and after food as measured in 24-hour periods was discussed. 1 It 

 is desirable, however, to group them in abstract here with other calo- 

 rimeter experiments with mixed diet not yet discussed. In two of the 

 mixed-diet experiments, but two food materials were used, one of the 



pp. 52 to 72. 



