2fi4 



EXPERIMENT STATION RECORD. 



months " with perfect comfort and in good condition on an average daily intake 

 of 0.20 gm. of nitrogen per liilogram of body weight, and with an average fuel 

 value of 70.3 calories per kilogram," while another animal as shown by a twelve 

 months' test required 0.31 to 0.33 gm. nitrogen per kilogram of body weight. 

 For a third dog under observation for nine months " proteid consumption equal- 

 ing 0.30 gm. of nitrogen per kilogram with a total fuel value in the day's food 

 of 66 to 70 calories per kilogram, was clearly quite sufficient to main+ain nitrogen 

 equilibrium and body weight." Data for 3 other dogs are also quoted. In gen- 

 eral, the diet contained only small amounts of animal food. According to the 

 author's observations, the digestion of fat under these circumstances was normal. 



In general, the author concludes that " the nutrition of man, if it is to be car- 

 ried out by the individual in a manner adapted to obtaining the best results, 

 involves an intelligent appreciation of the needs of the body under different con- 

 ditions of life, and a willingness to accept and put in practice the principles that 

 scientific research has brought to light, even though such principles stand 

 opposed to old-time traditions and customs. The master words which promise 

 help in the carrying out of an intelligent plan of living are moderation and 

 simplicity; moderation in the amount of food consumed daily, simplicity in the 

 character of the dietary, in harmony with the old saying that man eats to live 

 and not lives to eat. In so doing there is promise of health, strength, and 

 longevity, with increased efficiency, as the reward of obedience to Nature's 

 laws." 



Food and diet in the United States, C. F. Langworthy (U. 8. Dept. Agr. 

 Yearhook 1907, pp. 361-378). — Popular ideas regarding diet, the object of diet- 

 ary studies, methods of interpreting results of such investigations and similar 

 questions are discussed with special reference to the dietary work which has 

 been carried on in the United States. A brief summary is given of the results 

 of American and other dietary studies, and it is pointed out that in the inter- 

 pretation of results of such studies age, sex, muscular work, and similar factors 

 must be taken into account. The dietary standards suggested for man in full 

 vigor at moderate muscular work follow : 



Dietary standard for man in full rigor at moderate muscular worTc. 



Food as purchased 



Food eaten 



Food digested 



Grams. 



115 



105 



95 



Energy. 



Calories. 

 3,800 

 3,500 

 3,200 



Estimations of the amount of mineral matter required per man per day are 

 also given, the values quoted being deduced from a summary of available data. 



Estimated amount of mineral matter required per man per day. 



Phosphoric acid (PoO?,) 

 Sulphuric acid (SO3) . . . 



Potassium oxid 



Sodium oxid 



3^ 



2-3.5 



2-3 



4-6 



'Calcium oxid 



Magnesium oxid. 

 Iron 



0.7 -1.0 

 .3 -0.6 

 . 006-0. 012 



Chlorin 6 



The differences between so-called dietary standards and physiological require- 

 ments are discussed as well as the adequacy of the American diet, kind of food 

 eaten in American homes, and similar questions. 



