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In devising a plan of rectal feeding, it seems proper to take into consideration the following facts and principles.
Proof that the colon possesses adequate digestive capacity is lacking, and consequently all food introduced by way of the rectum should be completely predigested if it is not already in forms suitable for immediate absorption by the colonic mucosa.
It is necessary to think of the protein ration in terms of amino-acids, and of particular amino-acids, because the proteins of different foodstuffs split up into different groups of amino-acids, and the body not only requires for its synthetic purposes a definite variety of amino-acids, but requires them in particular proportions if its nitrogenous economy is to be favored. Articles of food whose protein contains potentially all the amino-acids that the body needs in approximately ideal proportions are animal flesh, eggs and milk. Flesh and eggs are undesirable because of their tendency
CORNWALL EE. A PLAN OF RECTAL FEEDING. JAMA. 1918;70(20):1451. doi:10.1001/jama.1918.02600200017007