486 NUTRITIONAL REQUIREMENTS 



which contains more than five hundred papers, will show the 

 propriety of so doing. 



Relation Bet ween Protein Requirement and Total Energy 

 Requirement. How large a part of the energy requirement 

 must be furnished the economy in the form of protein? 

 That depends entirely upon the kind of nutrition. Thus 

 F. Siegert 9 found that a fairly favorable nutrition for the 

 growing child can be attained if the protein calories repre- 

 sent nine or ten per cent, of the quantity of food appropriate 

 to the subject. In an investigation made in Tigerstedt's 

 laboratory 10 the result indicated that of the 4000 calories of 

 the food of a Finnish farmer or of students, about 15 per 

 cent, are ingested in the form of protein. Eubner found 

 that a physician, whose energy requirement he had con- 

 trolled, ordinarily covered twenty per cent, with protein ; in 

 a Bavarian woodsman, however, only eight to nine per cent. 

 It might, of course, be that accidentally both the physician 

 and the woodsman were using the same daily amount of 

 about one hundred grams of protein, but while the physician 

 had an energy requirement of about 2400 calories, the woods- 

 man was by chance using twice this amount. Persons who 

 do but little muscular work must, of course, ingest the same 

 protein proportion in a smaller general quantity of food. 

 The amount of protein in human diet is, as 0. Cohnheim 

 believes, 11 nearly the same in all peoples who have been 

 studied, Germans, Scandinavians, Italians, Transylvanians, 

 Americans, Japanese and Malays. Independently of race, 

 climate and occupation the figures for crude protein are said 

 to be everywhere from 100 to 130 grams, for pure protein 



F. Siegert (Cologne), Arch. f. exper. Pathol., S'chmiedeberg Festschr., 

 489, 1908; cf. statements as to energy determinations of nutritional require- 

 men in the infant, by O. and W. Heubner, Jahrb. f. Kinderheilk., 72, 121, 1910; 

 A. Schlossmann and H. Murschhauser (Dlisseldorf), Biochem. Zeitschr., 26, 

 14, 1910. 



10 S. Sundstrom (Tigerstedt's Lab., Helsingf ors ) , Dissert., Helsingfors, 

 1908, Skandin. Arch. f. Physiol., 19, 78, 1907. 



U 0. Cohnheim, 1. c., p. 452, et seq. 



