Abstract
Four hours after protein ingestion a steady state is attained between the increase in energy metabolism and urinary N. The ratio of total excess calories to total excess N is nearly the same after 4 hrs. as after 10-20 hrs. These results confirm the usefulness and significance of the demonstrated correlation between excess calories and excess N in the specific dynamic action of protein in animals. Analysis of the data upon which Aubel and Schaeffer based their criticism of the significance of this correlation shows that this criticism is invalid.

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