Some Factors Influencing Nitrogen Economy during Pregnancy

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Abstract
Twenty-three 4-day balance experiments during pregnancy and one 4 weeks prior to pregnancy on six women are presented in this report. The results show relatively lower nitrogen retentions than those of previous studies, except when the diets were increased with additional protein or supplemented with accessory factors, particularly the vitamin B complex. The average intake, including supplemented diets, was 11.58 gm. of nitrogen daily with a storage of 1.97 gm. Tendencies to greater absorption rates as shown by higher coefficients of digestibility and by lower fecal residues were observed in this series and are discussed in relation to the metabolism of other elements. A knowledge of the nutritional history of the mother, both in the pregravid period and through all of gravidity is essential to the proper interpretation of nitrogen retentions during pregnancy.

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