JAMA. 1913;60(12):904-909. doi:10.1001/jama.1913.04340120030018.
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ANIMALS AS CONVERTIERS OF PLANT NUTRIMENTS INTO HUMAN FOODSTUFFS  There are numerous circumstances under which questions of economy in the use of foodstuffs need to be taken into consideration. The problem of the cost of production of our nutrients is one that appears to be growing in importance and seriousness from decade to decade. In the extensive use of animal foods, so common in most civilized natins to-day, it is rarely borne in mind that the production of this type of nutrient involves a conversion of plant food into animal foodstuffs —a transformation inevitably necessitating a sacrifice of considerable energy. The animal which devours the plant products requires no small proportion of the stored energy for its own manintenance, that is, its normal life processes; accordingly the residue available for the production of meat and fat or the secretion of milk, which may become avaialble to man as dietary articles, must represent a correspondingly smaller portion of the actual


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