Foods are divided into two main groups: nitrogenous, or
proteid, foods, i.e., those which contain nitrogen, and
nonnitrogenous, i.e., those which do not contain
nitrogen. The latter group embraces the fats and
carbohydrates, which collectively are sometimes termed
heat producers or respiratory foods, since by oxidation
in the body they especially subserve the production of
heat. The proteids, on the other hand, are known as
plastic foods or tissue formers, since no tissue can be
formed without them. These latter terms, however, are
misleading, since proteid foods may also give rise to
heat both directly and indirectly, and the fats and
carbohydrates are useful in other ways than in
producing heat.
[1913 Webster]
Foods are divided into two main groups: nitrogenous, or
proteid, foods, i.e., those which contain nitrogen, and
nonnitrogenous, i.e., those which do not contain
nitrogen. The latter group embraces the fats and
carbohydrates, which collectively are sometimes termed
heat producers or respiratory foods, since by oxidation
in the body they especially subserve the production of
heat. The proteids, on the other hand, are known as
plastic foods or tissue formers, since no tissue can be
formed without them. These latter terms, however, are
misleading, since proteid foods may also give rise to
heat both directly and indirectly, and the fats and
carbohydrates are useful in other ways than in
producing heat.
[1913 Webster]
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