HOW DO WE USE FOODS? 



317 



candy in a year to equal five times the weight of each 

 boy and girl in that class. If you want to keep that school- 

 girl complexion, substitute sweet fruits for candy. 



Growth Foods. But the body grows and has to repair 

 itself. Cells multiply in number as we grow in height and 

 weight. They 

 must be made 

 out of some- 

 thing. Chemi- 

 cal analysis of 

 the living stuff 

 out of which 

 the cells are 

 formed shows 

 it to be a very 

 complex sub- 

 stance made up 

 chiefly of car- 

 bon, hydrogen, 

 oxygen, and 

 nitrogen, with 



Are you a candy eater? If so, why not figure out how 



many pounds you eat in a year, and insert the results in 



your workbook ? 



a much smaller 

 amount of sev- 

 eral other ele- 

 ments. The carbohydrates contain the elements carbon, 

 oxygen, and hydrogen, but the proteins contain in addi- 

 tion the element nitrogen. Evidently then, living matter 

 can only be built out of proteins, for the other foods do 

 not contain this necessary element. This is why we call 

 the proteins growth foods. Examples of such foods are 

 lean meat, peas, beans, eggs, cheese, fish, and nuts. 



The Protective or Regulative Foods. The human 

 machine is not foolproof and will not run efficiently with- 

 out intelligent care. Most of us eat what we like, without 

 thinking very much of its effect on our bodily comfort. 



