DE2 STORRS AGRICULTURAL EXPERIMENT STATION. 
THE MATERIALS AND ENERGY ACTUALLY CONSUMED AND 
THOSE GAINED OR LOST BY THE BODY. 
In the discussion and tables above, the distinction has been 
made between the quantities of nutrients in the total food, those 
in the food digested and those actually consumed. Where the 
organism is in equilibrium, and there is neither gain nor loss 
of material, the quantities digested and those consumed would 
be the same. When, however, there is a gain of protein or fat 
the quantity consumed is less than that digested. On the other 
hand a loss of protein or fat corresponds to a consumption in 
excess of the amounts digested from the food. The tables give 
the quantities of energy corresponding to the nutrients con- 
sumed, as well as those eaten and digested. From these data 
tables 15 and 16 are drawn up with the purpose of indicating 
more clearly the comparison of protein and energy in the nutri- 
ents digested and in the material actually consumed in the body, 
together with a gain or loss of protein and energy. It is inter- 
esting to note the differences in the different experiments with 
the three persons who were the subjects. The differences in 
the persons as to weight, ordinary occupation and diet have 
been already referred to. It will, however, be of interest to 
add that some studies had been previously made which throw 
a little more light upon the dietary habits of two of them. 
Two dietary studies were made in the family of the laboratory 
janitor, one in November and the other in March.* In these 
the average protein in the food eaten per man per day was 
estimated at 126 grams, and the total energy of the nutrients 
at 3,900 calories. The corresponding amounts digested were 
estimated at approximately 116 grams of protein and 3,660 
calories. This was, on the whole, a liberal diet. It is slightly 
larger than the standard tentatively proposed by Prof. Atwater 
for an ordinary man at moderately hard muscular work. 
Two dietary studies were made by the subject of experiment 
4 at his home in a country town in another State on the occa- 
sion of vacation visits, one in the winter and the other in 
summer.t There was but little difference between the results 
of the two, and it may be supposed that they represent the 
dietary habits which this gentleman had naturally acquired. 
The averages per man per day were, approximately, for the 

* Page 117, beyond; dietaries Nos. 15 and 19. + Ibid, Nos. 27 and 174. 
