150 Physiology. 



and fowl, macaroni and cheese ; they " go well together " 

 chiefly because each contains what the other lacks. 



Disadvantages of a One-sided Diet. In order to get 

 enough nitrogen from bread alone, one would have to eat 

 about four pounds a day ; meanwhile twice as much car- 

 bon as is needed would be taken, thus throwing an undue 

 amount of work upon the digestive organs. Again, one 

 would need to consume about six pounds of meat to get 

 the requisite amount of carbon, and six times as much 

 nitrogen as is needed would be taken ; to get rid of this 

 extra nitrogen would severely tax the kidneys and liver. 



Effect of Cold on Appetite for Fats. In cold climates 

 a large amount of fat is consumed, while in the tropics 

 starch is the chief food. Our appetites call for more of 

 the fatty foods during the winter season. 



Proper Diet. While common experience has led people 

 to adopt a mixed diet, the proportions of the different food- 

 stuffs is not always what it should be. The proportions 

 of the foodstuffs (exclusive of water) may be roughly stated 

 as about I part of proteid, I part of fat, 3 parts of carbo- 

 hydrates. But this will vary somewhat with the amount 

 of work done, and other varying conditions. 



Vegetarians. The so-called "vegetarians" recognize 

 the need of proteid food, and most of them seek proteid in 

 eggs, milk, and cheese. But these are animal products, 

 and the name "vegetarian" is inconsistent. They are 

 merely " anti-meat eaters." That we are adapted for 

 using flesh as part of our food is indicated in at least two 

 anatomical features : (i) we have canine teeth, though not 

 so fully developed as in the carnivora ; (2) the intestine in 

 carnivora is very short, that of the herbivora very long, 



