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Thesis (M.S.)—University of Nebraska—Lincoln, 1972. Department of Food and Nutrition.


Copyright 1972, the author. Used by permission.


Niacin nutritive status of adolescent boys receiving self-selected or corn based diets has been investigated over a 2-year period. Information was collected on niacin and other B-complex vitamin intakes on a month-to-month basis of adolescent boys receiving self-selected diets.Anthropometric and biochemical measurements of nutritional status were also made.

In a controlled balance study adolescent boys were fed opaque-2 corn as the near sole source of dietary protein (6.0 g N/day from corn).During one experimental period, urea supplements to supply an additional 4.0 g N per day were employed to improve protein nutriture. Diets supplied 31.40 mg of niacin (9.90 mg from corn, 1.5 mg from basal diet, 20 mg from vitamin supplement).On the basis of urinary niacin excretion and of serum niacin concentration, urea supplementation had neither positive nor negative effects on niacin nutriture.However, in comparison to values of subjects while receiving self-selected diets, serum niacin values and urinary niacin excretion values were depressed while subjects consumed corn diets. This suggests a lowering of niacin nutritional status of subjects while receiving corn diets even though diets were supplemented with niacin to an assumed optimal level and even though total niacin intakes of subjects were similar whether on self-selected or on corn diets. Results support the idea that the total nutritional environment rather than simple niacin intake figures must be taken into consideration in understanding niacin nutritional status of humans.

Advisor: Constance Kies