The Composition and Food Value of Bread. 5 



required daily for this purpose by an average man is 100 grams, 

 or in English weight, about 3^ oz. 



Combining these two statements, it is commonly accepted 

 that the standard dietary of a healthy man must provide energy 

 amounting to about 3,000 calories, and must contain about 

 3i oz. of protein. These conditions are satisfied by a diet con- 

 taining 3^ oz. of protein, 500 grams, or rather over 1 lb. of 

 carbohydrate (sugar, starch, and similar substances), and 50 

 grams, or rather less thaii 2 oz. of fat. These figures apply to 

 the case of a man of average weight who performs daily a 

 moderate amount of light muscular work. It is necessary to 

 increase them all round if the subject is engaged in heavy 

 work, and they may be decreased if the subject remains 

 practically at rest. 



To check these figures, I have used the results of an 

 inquiry as to the average dietary of agricultural labourers in 

 all parts of England, carried out for the Board of Trade 

 by 114 investigators in 1902, and published in Blue Book 

 Cd. 17(il, 1903, page 210. From the figures there given I 

 have computed, by the aid of the tables contained in Bulletin 

 No. 28 (revised edition), U.S. Department of Agriculture, pp. 

 19 — 77, the amount of protein consumed per day per head, and 

 the energy value, of the daily dietary of an average agricultural 

 labourer. The figures in the first column of Table I. are those 



Table I. — Protein and Energy Value of the Average 

 Weekly Dietary of a Farm Lahourer^s Family. 



