348 THE FOODS WE EAT 



V. Green vegetables should be included in the daily dietary 

 because they: (21) supply us with many necessary minerals; 

 (22) are our best sources of fat ; (23) are all rich in proteins ; 

 (24) supply vitamins ; (25) supply energy at low cost. 



VI. We must count our Calories in our food because : (26) it 

 is the fashion to do so ; (27) each one of us needs a given number 

 of Calories, depending upon the work we do; (28) overweight 

 people need fewer Calories than underweight people; (29) age, 

 weight, and occupation demand a different number of Calories; 

 (30) young people need more Calories than older people. 



VII. Refrigeration: (31) is one means of keeping foods from 

 spoiling; (32) uses well-insulated containers to regulate temper- 

 ature ; (33) kills germs because its temperature is so low ; (34) makes 

 possible the transportation of milk for long distances; (35) is 

 economical because it keeps foods fresh for such a long time. 



VIII. Foods may be kept from spoiling by : (36) drying them 

 so that bacteria will not grow ; (37) putting them in a cold ice 

 box ; (38) sterilizing them ; (39) adding salt, sugar, or other 

 preservatives to them; (40) eating them as soon as they are 

 cooked. 



IX. Milk is the best food for young people because it : (41) con- 

 tains a good deal of protein ; (42) contains all the body-building 

 and body-regulating foods; (43) contains vitamins; (44) is our 

 best source of calcium ; (45) is very cheap. 



X. Cooking is useful because it : (46) kills germs ; (47) makes 

 foods taste good ; (48) softens food so that it may be easily digested ; 

 (49) makes possible the addition of fat in frying, which aids in 

 digestion ; (50) makes meats more palatable. 



THOUGHT QUESTIONS 



1. Suppose you live in a part of the country that has a deficiency 

 of iodine in its water supply. What should you do about it? 



2. Devise an experiment by which you can prove that bacteria 

 and not molds are responsible for the spoiling of some particular 

 food. Show all the steps of the experiment, tell what foods you 

 would use for it, and just how you could prove your point. 



3. Determine which would be cheaper for a five-year period, 

 an ice box which cost originally $70 and which uses 700 pounds 

 of ice a month at 60^ a hundred, or an automatic iceless refrigerator 

 that costs $300 and costs $2 a month to operate. Allow 50^ 

 a month for food saved by the iceless refrigerator over that saved 

 by the ice refrigerator and charge 6% interest on the investment. 



4. What processes are dependent upon yeast? 



