DAILY QUANTITY OF FOOD REQUIRED. 

 A HEALTHY ADULT REQUIRES IN 24 HOURS 



481 



In an analogous example from Vierordt, the elementary substances in the food 

 are given (p. 446), and compared with the income and expenditure. 



AN ADULT DOING A MODERATE AMOUNT OF WORK TAKES IN:- 



Add 744'H grm. from the air by respiration. 

 2,818 H 2 0. 



32 ,, Inorganic compounds (Salts). 



The whole is equal to 3 kilo., i.e., about ^ of the body- weight ; so that about 

 6 per cent, of the water, about 6 per cent, of the fat, about 1 per cen.t. albumin, 

 and about 0'4 per cent, of the salts of the body are daily transformed within the 

 organism. 



AN ADULT DOING MODERATE WORK GIVES OFF : 



Add to this (besides 2,818 grammes water as drink), 296 grammes water 

 formed in the body by the oxidation of H. These 296 grammes of water contain 

 32,89 grammes H, and 263,41 grammes 0; 26 grammes of salts are given off in the 

 urine, and 6 by the fseces. 



Effect of Age. The investigations of the Munich School have shown, 

 that the following numbers represent the smallest amount of food 

 necessary for different ages : 



