1913'\ Chemistry of Diet 1T9 



that the carbo-hydrate oxydizes in the body to form water and 

 carbon dioxide, while the protein substances gives such end pro- 

 ducts as urea and uric acid. Therefore, the body has eventually 

 from a high carbo-hydrate diet, simple chemical end-products, 

 which are not associated with trouble in elimination. It is impor- 

 tant to supply ample fuel value in readily digestible carbo-hy- 

 drate in order to spare the protein. It is more justifiable to deal 

 out the carbo-hydrate in excess in the diet than any other consti- 

 tuent. It is "handled" by the body with the least effort and 

 saves any protein which should go into forming new body tis- 

 sues from having to act as a fuel on account of shortage else- 

 where of either fat or carbo-hydrate. This sparing action of 

 the carbo-hydrate upon the fuel protein or tissue protein is no- 

 where better shown than in the case of the Southern negro in 

 the fields during the sugar cane season. He quite largely exists 

 upon the thick syrup of the sugar cane, and naturally conserves 

 in this way his limited amount of protein, and thus meets the 

 "high cost of living." 



Referring again to the fat portion, I may say that 

 the theory of transmigration of fat globules seems 

 untenable. There is great doubt if any neutral fat passes to 

 epithelial cells of the intestines as such. It must be split up by 

 the combined action of the alkaline pancreatic juice and bile 

 into its simpler constituents, the fatty acids and glycerine. To 

 be sure, the fat soluble dyes, such as Sudan 3 and Biebrich 

 Scarlet, when fed dissolved in such fat as olive oil, do appear 

 in the laid-on adipose tissue and in the lipoid layers in the 

 yolk of the egg. But this does not prove the transmigration of 

 neutral, undigested fat, which may be explained by the ab- 

 sorbtive action of the circulating bile upon the split fatty acids 

 and dye at the same time. In other words, the transport of 

 fat-soluble dye may be done by the bile and finally deposited 

 with the adipose tissue, where we find it in post-mortem. If 

 glycerine and fatty acids are fed, fat will be formed and de- 

 posited the same as from a diet of neutral fat. Also, if the 

 soaps of the fatty acids are fed the corresponding fats will be 

 deposited. Furthermore, if fatty acids alone are fed, fat will 



