no 



TROPICAL FOODS 



yeast, milk, cereals, and probably in muscle juice, brain, fish, 

 legumes, and fresh vegetables. With regard to cereals, they are 

 present in the germ and subpericarpal layers of the bran of wheat, 

 in rice bran, and in the pericarp and outer layers of maize. 



Their action upon metabolism is unknown, and it is still doubtful 

 whether they assist anabolism as hormones. 



The processes associated with the sterilization and canning of 

 foods destroy vitamines. 



Lipoids. — ^The best known of the lipoids is lecithin, and it is sug- 

 gested that they are required to enable amino-acids, fats, and salts 

 to enter the cells of the body, and so'to form the colloidal substances 

 thereof. It is further suggested that mice cannot live on lipoid- 

 free food, and that perhaps vitamines are unable to enter the cells 

 except as lipoidal compounds, but the whole subject is very nebulous. 



LITTLE-KNOWN MATTERS. 



All proteins contain amino-acids, but these are not combined 

 in the same proportions, and it appears possible that a minimum 

 thereof is necessary for the growth, if not for the maintenance in 

 health, of the organism; but the whole subject is in its infancy, 

 and the same holds good with regard to the salts, some of which 

 may be necessary for proteins and others for the lipoids. 



REFERENCES. 



The most valuable works are McCay (191 2), ' Protein Element in Nutrition, ' 

 London, and Wilson (191 7), Report of the Prison Diets Committee, Cairo. 

 We feel that anyone interested in tropical diets ought to be conversant with 

 these works. In addition Tibbies (1912), 'Foods,* and (1914) 'Dietetics,' 

 appear to be those most useful to the tropical practitioner. 



Armand Hoyson (191 i).. Philippine Journal of Science. (Rice as a Food.) 



Atwater (1902), Bull. 177, U.S. Dept. Agriculture. 



Belli (1918). Annali Medicina Navale. 



Belli (1919)- Annali Medicina Navale, Vol. II., Fasc. v.-vi. 



Benedict (1906). American Journal of Physiology. With Carpenter (1910). 



Metabolism and Energy Transformation. 

 Campbell. Evolution of Man's Diet. 



Chittenden {1907). The Nutrition of Man, vol. xvi. London. 

 Church. Food Grains of India. 



Eraser and Stanton (1911). Studies from the Institute for Medical Re- 

 search, Malay States, No. 12 (Etiology of Beri-beri). 



Friedenthal (1914). Allgemeine und Spezielle Physiologic des Menschen- 

 wachstums. (Good bibliography.) Berlin. 



Funk (1911). Journal of Physiology, xliii. 395. 



Hindhede (1913)- Protein and Nutrition. London, 



Hutchinson (1911)- Food and the Principles of Dietetics. 



L.\NGWORTHY (1897). United States Department of Agriculture, No. 46. 



Macknight (1904). Food for the Tropics. London. 



McCay (1907). Indian Medical Gazette, xlii. 370; and Scientific Memoirs 



Government of India, Nos. 34, 37, and 48. 

 McKiLLOP (1916). Food Values. London. 



