FOODS AND DIETARIES 285 



Normal Heat Output. The following table gives the result of 

 some experiments made to determine the hourly and daily expen 

 diture 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 



CONDITIONS OP MUSCULAR ACTIVITY 



AVERAGE 

 CALORIES 

 PER HOUR 



Man at rest, sleeping . . . ' . . '. . . 

 Man at rest, awake, sitting up . -. ;. 

 Man at light muscular exercise , * .?,. ... .. 



Man at moderately active muscular exercise 

 Man at severe muscular exercise . . . f 

 Man at very severe muscular exercise . i 



65 Calories 

 100 Calories 

 170 Calories 

 290 Calories 

 450 Calories 

 600 Calories 



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 



2225 



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

 on page 284. 



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 protein, 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 

 has made up a number of tables, in which he has designated 

 portions of food, each of which furnishes 100 Calories of energy. 



1 The above tables have been taken from the excellent pamphlet of the Cornell 

 Reading Course, No. 6, Human Nutrition. 



