5 i 6 TEXT-BOOK OF PHYSIOLOGY 



From the foregoing figures the following table of the general metabolism 

 is made: 



From Lusk's "Nutrition.' 



From the foregoing table it will be readily observed that with each sus- 

 ceeding day there was^ metabolized as the result of activity and for purposes 

 of heat-production a certain quantity of protein and fat which on the 

 fifth day amounted to 71.7 grams and iSi.2 1 grams, respectively, yielding 

 together 1970.8 Calories. 



In prolonged starvation the metabolism of protein and fat continues 

 though in diminishing amounts until both reach the minimum just previous 

 to death, which for the protein is about 1 8 or 20 grams. The minimum for 

 the fat at this period depends on the amount of fat in the body prior to the 

 starvation period. 



During the course of the starvation there is a corresponding decline in 

 the body weight. Coincidently certain disorders of nutrition arise. (For 

 further particulars regarding starvation metabolism, the loss of weight of 

 different tissues and the post-mortem appearance the reader is referred to 

 pages 128 and 129.) 



THE METABOLISM OF THE BODY ON A MIXED DIET 



As an illustration of the result of a jmetabolism experiment on a mixed 

 diet the following, experiment of Pettenkofer and Voit may be cited. The 

 subject was a man, weighing 70 kilograms and at rest. 



On a mixed diet the materials under outcome were collected; from 

 their amounts it was calculated that the body had received the amounts of 

 the food principles under income. 



COMPARISON OF THE INCOME AND OUTCOME 



Income 



Outcome 



It will be observed that the body was in nitrogenous equilibrium; that 

 it stored up 39.7 grams of carbon equivalent to 52 grams of fat, and that 

 it eliminated 174 more grams of water than were consumed. 



1 The fat is calculated from the carbon remaining after deducting the carbon derived from 

 the protein which is equal to 3.28 grams for each gram of nitrogen eliminated. 



