WHY WE EAT. 
137 
“ Well, tell me why.” 
5. “ Food causes our bodies to grow, and makes 
up for the waste that is always going on,” said 
May. “ But that is not all; it also gives us warmth 
and strength.” 
6. “ That is quite right,” said Miss Brooks, with 
a kindly smile. “ Then you have found out that 
our foods serve us as jiesh-formers and as heat- 
givers. Our bodies have often been compared to a 
steam-engine that does work, and our food to the 
fuel that gives it the power to do the work.” 
7 . “ Yes,” said May, “ my book says that. But 
I cannot understand it.” 
“ Well, perhaps I can make it clear,” was the 
reply. 
8. “In the first place, if we stop feeding the 
