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Metabolic Patterns in Preadolescent Children

XI. Response of Vitamin a and Carotene Serum Levels to Dietary Protein and Vitamin A¹

School of Home Economics, Agricultural Experiment Station, Louisiana State University, Baton Rouge, Louisiana

Thirty-six preadolescent girls were studied under controlled experimental conditions in which amount and source of dietary protein varied. The protein intake ranged from 0.6 to 3 g/kg and the protein from plant sources varied from 25 to 100% of the total protein intake. The effect of age, weight, and amount and source of dietary protein and vitamin A on the vitamin A and carotene serum levels was evaluated. All of the factors studied accounted for 61% of the variation in serum vitamin A and 78% of the variation in serum carotene. Although there was no conclusive evidence that the vitamin A and carotene serum levels were influenced by the levels of protein fed in these diets, each serum level was related to a particular source of protein. Specifically, serum vitamin A was associated with plant protein, whereas serum carotene was associated with animal protein. The single factor accounting for the greatest amount of variation in serum vitamin A was serum carotene. There was no significant difference in either serum level between groups receiving 22 and 40 g of plant protein/day.

Manuscript received 29 June 1964.