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January 24, 1914

WHAT BECOMES OF THE PROTEIN DIGESTION PRODUCTS?

JAMA. 1914;LXII(4):303-304. doi:10.1001/jama.1914.02560290053027
Abstract

The study. of the phenomena of nutrition is making rapid progress nowadays. So far as the rôle of the proteins is concerned, attention has become centered in the amino-acids as the fundamental food fragments with which all theories of nutrition must now be concerned.1 So long as it was still assumed that the proteins are absorbed in a form relatively like the original foodstuff — for example, as proteoses or complex polypeptids — the theory of their subsequent metabolism had to be framed somewhat differently from that suggested by the conclusions of the most recent writers who assume that a more complete disintegration takes place in the digestive tract. To say that we absorb our protein intake in the form of amino-acids is, however, a long way from explaining the subsequent stages by which the ingested nitrogen becomes a part of the tissues.

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