PROBLEM I . How to Choose Foods Wisely j g . 



20. What do we now call vitamin C? From which foods do we generally 

 get most of our vitamin C? Which other foods are rich in vitamin 

 C? Name four ways in which much of the vitamin C is often de- 

 stroyed in the preparation of vegetables. 



21. Explain fully what is needed for proper bone development. If sun- 

 shine contains no vitamin why is vitamin D called the sunshine vi- 

 tamin? Name three foods which are frequently irradiated and state 

 the effect on these foods. 



22. What do we know about vitamins E and K? 



23. List all precautions to be taken to save vitamins in keeping and pre- 

 paring foods. 



24. Why should we not depend on vitamin pills for our supply of 

 vitamins? 



Exercises 



1. In what proportions are proteins, carbohydrates, and minerals found 

 in common foods? Using the table in the text answer the following 

 questions: Do animal or plant foods contain larger percentages of pro- 

 tein? Do animal or plant foods contain larger percentages of carbohy- 

 drates? What foods contain large amounts of such important minerals 

 as iron and calcium? In general, what are the differences in composition 

 between leafy vegetables and root vegetables? Caution: The table is not 

 complete. How does this affect your answers? 



2. (a) A piece of hot iron when plunged into half a kilogram of water 

 raised the temperature of the water 6° C. How many Calories of heat 

 were added to the water? {b) How many Calories of heat would have to 

 be taken from a kilogram of water to lower its temperature from 75° C 

 to 69° C? 



3. The average Calories required per hour for each pound of a per- 

 son's weight are about as follows: 



In sleeping or lying awake \ Calories 



Sitting I Calories 



Typewriting ^ Calories 



Standing | Calories 



Walking at a moderate rate i| Calories 



Active exercise if Calories 



If you weigh 120 pounds and sleep 9 hours, you would require for those 

 9 hours 120 X 2 X 9 Calories. Decide about how many hours of the day 

 you spend in each kind of activity and, considering your weight, cal- 

 culate about how many Calories you need in 24 hours. 



4. Select five foods one normal portion of which supplies more than 

 100 Calories. Arrange them in order according to the number of Calories 

 supplied, beginning with the highest. 



