No. 6. DEPARTMI':N'I' ()!■' AGRlCUI/rUKl-: 94r, 



used — for instance, the loot-ton. which represents the torce required 



to raise one ton one foot. One calorie is e(inal very nearly to 1.53 



foot-tons. 



The foUoAving general estimate has been made for the average 



amount of potential energy in one pound of oacli of the classes of 



nutrients: 



Calories. 



In one pound of protein, 1.800 



In 1 pound of fats, 4,220 



In 1 pound of carbohydrates 1,860 



In other words, when we compare the nutrients in respect to their 

 fuel values, their capacities for yielding heat and mechanical power, 

 a pound of protein of lean meat or albumen of egg is just about 

 equivalent to a pound of sugar or starch, and a little over two pounds 

 of either would be required to equal a pound of the fat of meat or 

 butter or the body fat. 



Within recent years analyses of a large number of samples of 

 foods have been made in this country. In the table below the aver- 

 age results of a number of these anal^yses are given: 



«;(•—()— UMIl 



