I IO 



HUMAN BIOLOGY 



Beef 



Bread 



Bananas 



Nuts 



Potatoes 



Lettuce 



eggs, oysters, green corn, cabbage, pork, 

 watermelons, grains, crabs, fish, white or 

 Irish potatoes, yams, tomatoes. 



The Order in which Man increased his Bill 

 of Fare. — Flesh-eating animals have a short 

 food tube, as their food is digested quickly; 

 they have long, pointed teeth for tearing, sharp 

 claws for holding, and a rough tongue for rasp- 

 ing meat from the bones. Man's even teeth, 

 long food tube, soft and smooth tongue, and 

 flattened nails, indicate that he is suited for a 

 diet largely vegetable (see Table, p. iii). The 

 race at first probably ate tree fruits} both nuts 

 and fleshy fruits (Fig. 101). Because of 

 famine, or after migration to colder climates, 

 and after learning the use of fire, the race prob- 

 ably began to use flesh for food. Afterward 

 the hunters became farmers and learned to 

 cultivate grain, which formed a most important 

 addition to the food supply, and made possible 

 a dense population. Coarse, woody foods, like 

 the leaves and stems of herbs, were probably 

 added last of all. Woody fiber (cellulose) can 

 be digested by cattle, but it cannot be digested 

 by man. 



The Natural Guide in Eating is Taste. 

 Man should preserve his taste uncorrupted as, 

 next to his conscience, his wisest counselor 

 and friend. It has been developed and trans- 

 mitted through countless ages as a precious 

 heritage. Simple food is more delicious to 

 people with natural tastes than the most arti- 

 ficial concoctions are to those with perverted 

 taste. 



Animal Food. — Th&Jlcsh of animals 



furnishes proteid and fat (Fig. 102). 



As cooking coagulates and hardens 



1 See Genesis i. 29. Some raw food should be 

 eaten daily. Pecans are the most digestible of all 

 nuts. A half dozen or more eaten regularly for 

 breakfast will prevent constipation or cure it in ten 

 days or less. 



