380 



THE FOODS WE EAT 



thermometer | 

 shoeing char 



More Food Needed during the Growing Period. It is 



an old saying that growing boys need more food than 



grown men. Experi- 

 ments have proved this 

 to be true. Rapidly 

 growing boys between 

 the ages of 10 and 15 

 need about 2500 Calo- 

 ries a day, while girls of 

 the same ages require 

 about 2000 Calories a 

 day, older girls requir- 

 ing a little more and 

 younger girls a little less 

 than this amount. The 

 table on page 331 gives 

 an estimate based on 

 body weight. It will be 

 seen that as we grow 

 older, we require fewer 

 Calories per pound. 

 You can see why this is 

 so, for after we become 

 adults, the body does 

 not grow much in size. 

 Food is required for 

 repair purposes and for 

 the release of energy 

 but not for rapid growth. So we see the hearty appetites 

 of growing boys and girls have a scientific basis. 



Seasonal Differences in Food Requirements. Every 

 one knows that in hot weather we are not so hungry as in 

 cold weather. Have you ever stopped to think why this 

 is so? The body has a temperature of 98.6 F. In 

 cold weather more heat is lost than in warm weather, 



water for insulation. 



I :vater arounct bomb 

 \/armect bv burning- 

 of food 



The bomb calorimeter is used to find out the 



fuel value of food. Can you explain how it 



works ? 



