730 



PHYSIOLOGY 



Very few accurate experiments have been made on the daily 

 requirements of women. Since the average weight of a woman is 

 less than that of a man and the amount of work performed less severe, 

 she will require a smaller amount of food both to meet the energy 

 expenditure of the body and to provide for the repair of her 

 tissues. Voit, under the assumption that the body weight of woman 

 is four-fifths that of man, and that her energy requirements are 

 diminished in the same proportion, has given the following as the 

 daily requirements of a woman engaged in manual labour : 



Protein ..... 94 grm. 



Jr 3> u T:O . . 



Carbohydrate .... 400 ,, 



equivalent to a gross calorie value of 2444. 



RELATIVE PROPORTIONS OF THE DIFFERENT FOOD- 

 STUFFS IN THE DIET OF MAN 



Since we have exact determinations at our disposal of the total 

 energy output of a man under various conditions, it is easy to assign 

 a total diet to each class which shall satisfy these energy require- 

 ments. In such a diet fat and carbohydrate are mutually replaceable 

 in proportion to their calorie value, though it seems that in most 

 individuals for the conservation of perfect health a certain minimum 

 amount both of fats and carbohydrates is necessary. Some observers, 

 however, have described an increased output of carbon dioxide as 

 the result of the ingestion both of carbohydrates and of fats, pointing 

 to a stimulating effect on metabolism of these food-stuffs themselves. 

 If these results are generally applicable, we cannot regard the total 



