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Journal of the American College of Nutrition, Vol 10, Issue 4 308-314, Copyright © 1991 by American College of Nutrition

JOURNAL ARTICLE

Protein intake and urinary excretion of protein-derived metabolites in aging female vegetarians and nonvegetarians

M. E. Kunkel and R. E. Beauchene
Department of Nutrition and Food Sciences, College of Home Economics, University of Tennesse, Knoxville 37996-1900.

Relationships among age, protein intake, and urinary excretion of protein-derived metabolites were studied in 125 vegetarian and nonvegetarian women ages 40-92. There were 63 women in the vegetarian (AV) group and 62 women in the nonvegetarian (NV) group. Average daily intakes of energy and total animal and vegetable protein were calculated from 7-day dietary records. Twenty-four-hour urine samples were analyzed for total nitrogen, urea, creatinine, hydroxyproline, and inorganic sulfate. Energy intakes for the two groups were similar. AVs consumed less total and animal protein and more vegetable protein than NVs, even though both groups consumed more than the RDA for protein. No significant differences existed between the groups in the urinary excretion of total nitrogen, urea nitrogen, hydroxyproline, or inorganic sulfate. Energy and protein intakes and total nitrogen excretion were lower in older AVs than in younger AVs, while those of NVs increased between 40 and 55 years of age, and decreased among the older NV women. The relationship between these variables and age in NVs was more accurately described by polynomial rather than linear regression models.


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Copyright © 1991 by the American College of Nutrition.