WHAT TO EAT 145 



Since we do not sleep all the time or work all the time, the 

 amount of energy used up per day will depend upon one's daily 

 program. Thus, a person working in the steel mills twelve 

 hours a day, seven days in the week, expends more energy than 

 a clerk who sits at a desk eight hours making out pay rolls. The 

 energy needs of various classes of workers are given in the follow- 

 ing table, which combines the results of many different studies : 



Classes of Workers Calories per Day 



Woodcutter, lumberman 5000-6000 



Stonecutter, excavator, miner 4700^5000 



Farmer, cabinetmaker, painter 3500-4000 



Metal worker, mechanic 3400-3500 



Carpenter 2700-3400 



Weaver, bookbinder, tailor, shoemaker 2500-3200 



Business man, student 2400-3000 



Studies made in Finland with the respiration calorimeter give 

 the following table on the needs of women workers : 



Classes of Workers Calories per Day 



Washerwoman 2900-3700 



Housemaid 2500-3200 



Bookbinder 2100-2300 



Seamstress (on sewing machine) 2100-2300 



Seamstress (on hand work) 2000 



124. Climate and seasons. We know that the natives of 

 tropical countries eat very little meat, and that the natives of 

 cold countries eat very little fruit but a great deal of fat. W' e can 

 understand why the Eskimos eat no fruit ; but the inhabitants 

 of the tropics can get almost any kind of food they wish. The 

 fact is, however, that in a cold region it is necessary to provide 

 for a larger supply of body heat than in a hot region. Since fat 

 yields the greatest amount of energy for a given weight of fuel,^ 



^The fuel values of proteins, fats, and carbohydrates are as follows: 



