Nitrogen Excretion of Women Related to the Distribution of Animal Protein in Daily Meals

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Abstract
The nitrogen metabolism of 14 college-age women on a controlled diet which included no animal protein in the breakfast was compared with their nitrogen metabolism when the breakfast included 8 oz. of milk, although the total protein intake remained unchanged. During period A, when no animal protein was included in the breakfast, the average daily urinary excretion for all subjects was 9.02 gm nitrogen, S.D. 0.410, as compared with 8.33 gm, S.D. 0.290, during period B when animal protein from 8 oz. of milk was furnished with the breakfast. The difference in urinary excretion was 0.69, S.E. 0.134. In period A the average daily nitrogen absorption was -0.4% as compared with 10.3% in period B. The average daily nitrogen retention was -0.03 gm in period A as compared with 0.96 gm in period B. In view of the nature and significance of the findings, it is possible that the distribution of quantity and kind of protein in the three meals, as well as the total daily amount of protein, must be considered in determining protein requirements and utilization.