338 HUMAN PHYSIOLOGY 



Protein . . . 75 grams or 300 Calories. 



Fat 100 grams or 930 Calories. 



Carbohydrate 250 grams or 1000 Calories. 



Total 2230 Calories. 



We have not been at pains to keep the total precisely 

 the same. We are using only approximate figures for 

 the heat values of protein and carbohydrate so that 

 there would be no point in refining other parts of the 

 calculation. 



Once more, there is the possibility of the inclusion 

 of alcohol in the diet with some reduction of the other 

 non-nitrogenous foods. This may now be indicated: 



Protein 75 grams or 300 Calories. 



Fat 90 grams or 837 Calories. 



Carbohydrate 230 grams or 920 Calories. 



Alcohol . 25 grams or 175 Calories. 



Total 2232 Calories. 



When a ration is increased to meet the requirements 

 of heavy muscular work there is not likely to be any 

 great addition to the protein fraction. The extra 

 Calories are obtained from fats and carbohydrates, the 

 latter bearing the brunt of the demand. Among the 

 most surprising statistics of diet are those regarding the 

 huge intake of patients fighting tuberculosis. The 

 daily protein may exceed 200 grams, the fat 300, and 

 the carbohydrate 500, with energy totals in the vicinity 

 of 5000 Calories. The wasting of the tissues in this 

 disease can only be compensated by a protein supply 

 which in health would be considered most unhygienic. 



Conditions Affecting Metabolism. We have rightly 

 given the foremost place among the factors that de- 

 termine the amount of the metabolism to work. When 

 we say that exposure to cold greatly increases the oxida- 

 tion it might seem that we were introducing another 

 factor, but we are really instancing what is merely a 



