HOW DO WE USE FOODS? 



325 



most of the protective vitamins. The experiment shown 

 indicates the value of milk in the diet. Children should 

 have at least one quart of milk a day. 

 grams 



80 



1O 15 2O 25 3O 35 <4O 45 So 

 What does this demonstration show ? 



Demonstration 1. Effect of Milk in Diet of Rats. 



Take two white rats of equal size. Weigh them and record 

 their weights. Place them in adjoining cages under the same 

 conditions of air, water, and sunlight. Feed one rat on a weighed 

 ration containing milk, bread, and cabbage. Give the other rat 

 the same amount of weight of bread, cabbage, and water. Weigh 

 each rat at the end of one, two, and three weeks. Are there any 

 differences in weight ? How do you account for this difference ? 



SELF-TESTING EXERCISE 



Select from the following list those words which best fill the blank spaces 

 in the sentences below and arrange the words in proper numerical order. A 

 word may be used more than once. 



oils 



brown 



protective 



dairy 



vitamins 



coffee 



fuel 



regulative 



citrus 



vegetables 



mixed 



fats 



meat 



minerals 



growth 



green 



green 



carbohydrates 



yeast 



water 



proteins 



tea 



milk 



yellow 



