NUTRITION OF THE YOUNG 



143 



vers (hard labor) require 135 g. proteid, 80 g. fat, and 500 g. carbohydrates 

 = 3,348 Cal. gross and 3,013 Cal. net, and in war (severe labor) 145 g. 

 proteid, 100 g. fat and 500 g. carbohydrate = 3,575 Cal. gross and 3,218 

 Cal. net. 



Our Group IV contains on the average 3,618 Cal. net which can be supplied 

 in 141 g. proteid, 71 g. fat, and 677 g. carbohydrates. We see that this ration 

 agrees on the whole very well with that demanded by Voit. For a similar class 

 (3,569 Cal.) Atwater (IV) finds 124 g. proteid, 147 g. fat, and 510 g. carbo- 

 hydrates to be the requirement. 



The following data by Atwater may be given as further examples of diets 

 suited to severe labor: Participants in a rowing contest (American students): 

 155 g. proteid, 177 g. fat, 440 g. carbohydrates = 4,085 Cal. gross. Football 

 players : (1) 181 g. proteid, 292 g. fat, 557 g. carbohydrates = 5,740 Cal. (gross) ; 

 (2) 270 g. proteid, 416 g. fat, and 710 g. carbohydrates = 7,885 Cal. (gross). 



Direct information on the diet of women is still extremely meager. Hav- 

 ing a smaller body than man, and doing as a rule less physical work, a woman 

 naturally requires a smaller supply of energy than a man. Assuming that 

 the weight of the woman's body is four-fifths that of the man's and that her 

 metabolism bears the same relation to his, we obtain Voit's ration for female 

 workers: 94 g. proteid, 45 g. fat and 400 g. carbohydrates =-2,444 Cal. (gross) 

 and 2,200 Cal. (net). 



3. NUTRITION OF THE YOUNG 



It is evident that the growing body needs relatively more food than the 

 adult, both because it is smaller and because its organs must increase in size. 

 Moreover, experiment has shown that the young body has a more active 

 metabolism per unit of body surface regardless of its smaller size (page 118). 



In order to make possible a fuller presentation of the metabolism in the 

 growing body, we have brought together in the following table a number of 

 observations on the mean C0 2 -output taken a short time after a meal while 

 the individuals were sitting quiet. Still other data will be found on page 119 : 



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