302 VITALITY AND EFFICIENCY WITH RESTRICTED DIET. 



Table 42. — Total nitrogen in food during IS typical days after long diet restriction — Squad A. 



Table 43. — Total nitrogen in urine per 24 hours during 12 typical days after long restricted 



diet — Squad A. 



*The urine samples for December 16 were frozen in transit, and it was thus impossible to 

 obtain the nitrogen output for this day. 



The total nitrogen intake at this tune (table 40) is of special interest, 

 since it gives us an indication of the first reduction in diet, which 

 took place on October 4. Prior to this, although the subjects were 

 requested to eat as freely as they normally would, we find that the 

 nitrogen intake was surprisingly uniform with all men on October 1, 

 2, and 3, when the men were on an unrestricted diet. It is clear that 

 any difference in intake for these 10 days must have been in the non- 

 protein food materials, for these men had essentially the same protein 

 intake. Indeed, the daily intake for the individual men is almost 

 exactly the same save on October 1. This comparison of data presents 

 an interesting physiological study, however, inasmuch as we have 



