32 



NEW HAMPSHIRE EXPERIMENT STATION [Bull. 261 



formity not far from 70 calories and about 2 grams of protein. The 

 muffins varied considerabl}' in weight, from 30.5 to 46.5 grams, and the 

 energy content was approximate!}' proportional to the air-diy weight, 

 ranging from 135 to 218 calories. These obser\ations were made to as- 

 sist in the calculations given in Table '7 of the total energy and protein 

 consumed by Students 1 to 4. 



THE CALORIC VALUE OF AIR-DRY FOOD SAMPLES 



The main object of this investigation was not to make a precise 

 study of the total energy intake or the percentage of food energy wasted 

 bj' an}' one group of individuals. To be sure, the energy content of sev- 

 eral mixed foods and of a few extra foods was detei-mined, as a supple- 

 ment to our earlier studies. But our chief purpose was to ascertain the 

 average energy value of edible food waste per gram of air-dry material 

 and to compare this value with the average caloric value of any meal of 

 mixed foods, such as lunch or dinner. For convenience in making such 

 a comparison we have summarized in Table 10 the results of our anal- 

 yses reported in the preceding tables. Thus, the average caloric values 

 per gram of air-diy matter of the lunch and dinner samples listed in 

 Tables 3, 5, and 6, respectivel}-, together with the minimum and maxi- 

 mum \alues, are summarized in the upper portion of Table 10. The 

 average energy value is in all three instances exactly the same, 4.7 cal- 

 ories, although there is a considerable range between the maximum and 

 the minimum values, depending in large part upon the percentage of 

 fat in the meals. When \-isible fat is present, obviously the caloric value 

 will be greater. In the middle portion of Table 10 are given the energy 



Table 10. — Comparison of energy content of mixed meals 

 with that of edible icaste 



Data 



from 



Table 



No. 







' 17 

 1 18 

 ' 19 

 121 



1 

 1 

 2 



Type of sample 



Lunch and dinner 



Lunch and dinner 



Lunch and dinner 



Urcakfast 



Dinner 



Supper 



Total daily meals 



Kdible waste without visible fat ' 

 Ivlible waste with visible fat ' . .. 

 lOdible waste without visible fat. . 



Waste Ijy student 1' 



Waste by student 2' 



Waste by student 'i* 



Waste by student 4^ 



Number 



of 

 samples 

 analyzed 



24 

 52 



28 



26 

 71 

 59 

 14 



23 



25 



12 



() 



4 



5 



11 



CaIjOKies pek gram of 

 Air-Dhy Weioht 



Minimum Maximum 



4.0 

 3.9 

 4.3 



3.6 

 3.7 

 3.8 

 4.0 



4.0 

 4.0 

 4.2 

 4.4 

 4.5 

 4.6 

 4.3 



5.4 

 5.5 

 5.1 



5.1 

 5.7 

 5.7 

 5.5 



5.8 

 9.3 

 5.6 

 5.1 

 5.3 

 5.8 

 5.8 



Average 



4.7 

 4.7 



4.7 



4.3 



4.7 

 4.8 

 5,0 



5.0 

 5.3 

 4.9 

 4.7 

 4.9 

 5.0 

 5.0 



1929. 



See Benedict, F. G., and .\. G. Farr. I'niv. Xcw Hampshire, Agric. Expt. Sta., Bull. 242, 



Not iiicludinK Sami)les 743 and 751H. 

 ' Including Samples 743 and 751 H. 

 •• Butter included in some of the waste samples. 



