The body-weight chart of Can (see fig. 58, p. 212) likewise shows that during December there was an approximate period of maintenance and another similar period in January. From table 35 and from the height of the two energy blocks on Can's chart which, as stated before, were independently established by simply giving such an amount of food as would hold the weight constant without the pre-determina-tion of the caloric value, we find that during the first maintenance period (December 3 to 20) he required 2,479 calories and during the second period, (January 9 to February 3) the requirement was 2,386 calories. A close examination of the curves, however, shows a slight tendency for the body-weight to fall during these periods and we may state in round numbers that Can required 2,500 calories for maintenance at this lower level.

Table 35. - Nitrogen In Food, Energy Available To Body, And Nitrogen Excreted In Urine During Periods With The Different Diet Levels, Squad A.1

[Averages per day].

1 See detailed results in tables 46 to 58.

1 See detailed results in tables 46 to 58.

With Kon the conditions are somewhat different, inasmuch as he joined Squad A several weeks after the experiment was begun. The reduction in diet was therefore somewhat stringent and no clearly defined period of constancy in body-weight can be noted from the body-weight curve. (See fig. 59, p. 213.) There is, however, a tendency for the body-weight to be maintained at constancy between December 3 and 20, although the last weight shows a decided fall. In January the energy intake was adjusted to a lower level to compensate for the great increase in body-weight during the Christmas recess; during the last 10 days in January the weight remained very constant at this caloric intake. If we are to consider this energy intake as the probable need at this level, we may say that the body-weight was maintained with approximately 1,600 calories. But the evidence is not so clear as one could wish.

With Gar the reduction in body-weight followed the usual course. (See fig. 60, p. 214.) It became necessary in the early part of December to give a larger diet than before, to hold the body-weight at a constant level. Again, in the latter part of January, the food intake was increased after a preliminary reduction to offset the increased body-weight with which he returned to college. The body-weight was thus held approximately constant with a considerably lower energy intake than that in December. Probably an average of the two energy intakes will not be far from the correct value for the actual need, and we can say that 2,000 calories was the caloric requirement of Gar at the lower weight-level.

With Gul the body-weight was essentially constant in December with practically 2,000 calories, and in the last two weeks in January with 1,600 calories. (See fig. 61, p. 215.) We have reason to believe that this subject, who was unusually active physically, might have altered his activities somewhat between these two periods. An exact measure of this difference is hard to obtain, but it would not be unreasonable to assume that an average of the energy intake for the two periods represents the probable caloric requirement, namely, 1,800 calories.

With Mon dietetic readjustments were made somewhat frequently, owing to rather sharp falls in body-weight. (See fig. 62, p. 216.) Perhaps the best level is that indicated in the latter part of January, which shows that the caloric requirement of this man is not far from 2,000 calories.

With Moy the body-weight was held constant in December with an energy intake of approximately 2,100 calories, and again in January with the available calories slightly below the December intake. (See fig. 63, p. 217.) An average value of 2,000 calories will probably represent his caloric requirement at the lower weight-level.

One of the most physically active subjects we had was Pea. His body-weight was held at a low level over a considerable period of time during December with an intake of approximately 2,500 calories. (See fig. 64, p. 218.) The evidence indicates that during the latter part of January and the first of February 2,300 calories sufficed for this subject. We may therefore assume that 2,400 calories approximates his maintenance requirement.

Pec had great difficulty in reducing to a low weight-level and the dietetic readjustments were necessarily frequent. The body-weight was held approximately constant from January 20 to February 3 at not far from 1,600 calories, which may be taken as his maintenance requirement. (See fig. 65, p. 219).

The unfortunate illness of Spe necessitated the conclusion in December of the observations with him. His chart, however, shows with reasonable clearness that the intake of about 2,200 calories would suffice to hold his body-weight constant. (See fig. 66, p. 220.) Unfortunately, in this instance we have not the usual verifying period during January.

The subject most sedentary in habits, and the one who had the most difficulty in securing a reduction in weight, was Tom. Unquestionably, the calories in the diet during the first few days were more than he needed, and the dietetic curtailment prescribed for the rest of the men was not sufficient to reduce his body-weight; the intake was accordingly lowered still further. The blocks in his body-weight curve, (see fig. 67, p. 221), show an approximate constancy at the lower weight level with an intake of not far from 1,600 calories. This subject did not lose as much weight as the others, and his loss of nitrogen was materially less than that of the other men.

One of the most regular body-weight curves in the whole series is that of Vea, who lost weight very regularly, established an approximate level with 1,850 calories in December, and again essentially the same level in January with 1,900 calories. (See fig. 68, p. 222.) We may thus take 1,900 calories as his probable maintenance requirement.