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 o! 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 . . . . 

 Man at very severe muscular exercise . . 



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 



sleeps for 9 hours . . . f . .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 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 CorneU 

 Reading Course, No. 6, Human Nutrition. 



