86 



nutrients and energy in the food returned were also calculated, 

 although the results of the computations are not given in detail. It 

 was explained above that a part of this returned material, chiefly the 

 meat, bread, and potatoes was utilized again and the remainder wasted, 

 and the computations of the quantities of nutrients and energy in the 

 returned material that was wasted were made on this basis. 



Strictly speaking, this is not a part of the table waste, which, as 

 explained above, is material wasted at the plates; nor is it a part of the 

 kitchen waste, which is loss in the preparation and cooking of food. 

 Since it was actually wasted in the kitchen it might be more loo-ical to 

 consider it along with the latter, but for convenience it is here dis- 

 cussed with dining-room waste. Another reason for considering it 

 here is that part of the material designated in the tables as "food 

 wasted " should really have been returned to the kitchen. 



The quantities of nutrients and energy per man per day in the food 

 consumed and wasted are summarized in the following table. The 

 data hero included are average values derived from the results of all 

 the dietary studies, and probably represent the conditions for the 

 whole institution: 



Table 33. — Summary of data regarding nutrients and energy per man per day in food 



consumed and wasted. 



In food actually eaten 



In dining-room" waste 



In food returned: 



Used again 



Wasted 



Total In food provided 



Protein. 



Grams. 

 92 

 18 



5 

 1 



116 



Fat. 



Qrams. 



107 



14 



4 

 2 



127 



Carbohy- 

 drates. 



Grams. 

 (55 



11 



8 



452 



Energy. 



Calories. 

 2,792 

 457 



100 

 54 



3,403 



By referring to Ta))le 31 it will be observed that the table waste 

 ranged from 5 grams of protein and 146 calories of energy per man 

 per day in study No. 385 to 72 grams of protein and 1,864 calories of 

 energy in study No. 386. The average for the total number of persons 

 included in the studies, given in the table above, was 18 grams of pro- 

 tein and 457 calories of energy. If to this is added the portion of 

 returned food that was eventually wasted, the total amount of waste 

 was sufficient to supply on an average 19 grams of protein and 611 

 calories of energy per man per day. 



With regard to the food returned it ma}^ be observed that, while the 

 quantity that was eventually wasted was relatively large in compari- 

 son with the total returned, in actual nutritive value it was of much 

 less importance than that used again; for, as seen from the table above, 

 the latter contained 83 per cent of all the protein and 65 per cent of 

 all the energy of the food returned. 



