1070 



EXPERIMENT STATION RECORD. 



As regards licat of coinlmstioii and fuel value, the following stato- 

 ments are made: 



"Taking into account (1) the heatu of combustion of the j^rotein compound.s, fais, 

 and carboliydrates which occur in different groups of food materials, and (2) the 

 average proportion in which the different nutrients are furnished by different food 

 materials in the ordinary mixed diet, the average heat of combustion of 1 gm. of 

 protein, fat, and carboliydrates in such diet i.s Hiijjnixiniately 5.65, 9.40, and 4.10 

 calories, respectively. 



" One gram of total protein of mixed diet burned in the l)ody yields on the average 

 not far fr(jm 4 calories, 1 gm. of fat 8.9 calories, and 1 gm. of carbohydrates 4 calories 

 of energy. The corri'Sponding values per pound are 1,820, 4,240, and 1,820 calories. 

 One gram of available i^rotein, on the other hand, has a fuel value of 4.4 calories, 1 

 gm. of available fats 9.4 calories, and 1 gm. of available carbohydrates 4.1 calories. 

 These values correspond to 2,000, 4,260, and 1,860 calories per pound. 



"Of course these figures are not to be regarded as final, and alterations may be 

 called for as data accumulate. Meanwhile we think that they are sufficiently accu- 

 rate for ordinary use." 



The relative proportion of total food and total nutrients supplied by 

 a number of food materials and groups of foods, as shown l)}- the 

 results of 185 dietary studies, follow: 



Relative j'nqxjrtioun of totul food and of total mUrients applied bi/ difcrrnt (jroupa of 

 food materials in average of 185 dietary studies. 



The average coefficients of availability of tlie nutrients of different 

 groups of food materials and of the total tuitrients of a mixed diet 

 are given. 



