METABOLISM 



15 



Calories. 



1,550 

 240 



Calories. 



that the balance is stored up in the tissues in the form 

 of fat. This is a point, however, which requires a little 

 further discussion. 



BALANCE-SHEET OF ENERGY (IN CALORIES). 



Man 0/56 kilogrammes. 

 EXPENDITURE. INCOME. 



1. Internal work (heart, 



respiration, heat 

 production) 



2. Digestive work 



3. External muscular 



work 

 (a-) Actual work 



done ... 250 

 (b) Increase 



under (1) 590 



pro- 



70 grammes of 



tein = 287 



50 grammes of fat = 465 

 500 grammes of carbo- 

 hydrate ... - 2,050 



840 



Total 2,630 Total 



Balance, 172 Calories = 17 grammes of fat, or about 

 ounce of adipose tissue. 



2,802 



Storage of Surplus Energy. It is taught by physio- 

 logists that any surplus of income over expenditure of 

 energy is inevitably stored up in the form of fat. If, 

 for example, an individual consumed a diet which con- 

 tains just as much energy as he is expending daily, and 

 we add to this 1 pint of cow's milk, we shall increase 

 the intake of energy by about 425 Calories. If this be 

 stored, it will form 45 grammes of fat, or 2 ounces of 

 adipose tissue, and the individual's weight will go up 

 by this amount every day. From the practical point of 

 view, however, the matter would seem not to be so 

 simple as this. One cannot ensure, by merely supplying 



