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Nitrogen Metabolism of Preschool Children

New York State College of Home Economics, Cornell University, Ithaca

Nitrogen metabolism has been studied in eight preschool children on protein intakes of between 45 and 58 gm per day. The basal diet was supplemented with ascorbic acid, potassium citrate, and orange juice as indicated. The results were as follows:

1. The nitrogen intake was probably not a factor influencing nitrogen retention, since from 88 to 94% of the ingested nitrogen was absorbed, and only 3.3 to 9.8% was retained.

2. The nitrogen retention was not significantly altered by the addition of 100 mg of ascorbic acid to a diet containing 23 to 25 mg of the vitamin.

3. The nitrogen retention was not significantly altered by the addition of 3.38 gm of potassium citrate to the diet.

4. The percentage retention of nitrogen was highest in all four subjects tested, when an orange juice supplement, equivalent in ascorbic acid and citrate value to the crystalline supplements, was added to the basal diet.