FOODS AND DIETARIES 



339 



This table was worked out from a knowledge that different 

 amounts of energy are released by the body at different times and 

 under differing conditions. 



Normal Heat Output. — The following table gives the result of 

 some experiments made to determine the hourly and daily expendi- 

 ture of energy of the average normal grown person when asleep 

 and awake, at work or at rest. 



Average Normal Output of Heat from the Body 



L 



It is very simple to use such a table in calculating the number of 

 calories which are spent in twenty-four hours under different bodily 

 conditions. For example, suppose the case of a clerk or school- 

 teacher leading a relatively inactive life, who 



sleeps for 9 hours ... 

 works at desk 9 hours 

 reads, writes, or studies 4 hours . 

 walks or does light exercise 2 hours 



This comes out, as we see, very close to example 6 of the table ^ 

 on page 337. 



fiow we may find whether we are eating a Properly Balanced 

 iDiet. — We already know approximately our daily calorie needs 

 and about the proportion of proteid, fat, and carbohydrate needed. 

 Dr. Irving Fisher of Yale University has worked out a very easy 

 method of determining whether one is living on a proper diet. He 



' The above tables and those which follow have bocn taken from the excellent 

 pamphlet of the Cornell Reading Course, No, 6, Human Xutrilion. 



