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 OP HEAT FROM THE BODY 



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 X 65 calories = 585 



works at desk 9 hours ...... X 100 calories = 900 



reads, writes, or studies 4 hours .... X 100 calories = 400 



walks or does light exercise 2 hours . . X 170 calories = 340 



2225 



This comes out, as we see, very close to example 6 of the table 1 

 on page 337. 



How we may find whether we are eating a Properly Balanced 

 Diet. 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 



1 The above tables and those which follow have been taken from the excellent 

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



