198 



FOODS AND DIETARIES 



if they furnish from .06 to .12 pound of protein for ten cents; expensive if they 

 furnish less than .06 pound of protein for ten cents. 



Conclusion. — 1. Pick out ten cheap, ten medium, ten expensive 

 tissue-building foods. 



2. In which of the following groups are the cheapest protein 

 foods found : meats, cereals, vegetables, fish, shellfish, dairy prod- 

 ucts, fruits? Note also the most expensive. 



Problem 173 : To find the value of food as a source of energy 

 compared with its price. 



Method. — Use the following tables as suggested above. 



NOTE. — Cheap foods give more than 1500 units of energy for 10 cents at pres- 

 ent prices ; medium priced give between 750 and 1500 units of energy for 10 cents at 

 present prices ; expensive give less than 750 units of energy for 10 cents at present 

 prices. 



Conclusion. — 1. Find ten cheap fuel- or energy-giving foods, 

 ten medium priced, and ten expensive ones. 



2. Can you find ten foods that are cheap both as energy pro- 

 ducers and as tissue builders? 



NOTE. — An interesting exercise on economic buying of foods for a family or for 

 individual consumption may be worked out from this table, which has been revised 

 by inserting present-day prices. This is of especial value in connection with work 

 in home economics. 



Comparative Nutritive Values and Prices of Food Materials x 



1 Revised by John W. Teitz of the Department of Biology, De Witt Clinton 

 High School. 



