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American Journal of Clinical Nutrition, Vol 65, 1434-1440, Copyright © 1997 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Use of a new vitamin C-deficient diet in a depletion/repletion clinical trial

J King, Y Wang, RW Welch, KR Dhariwal, C Conry-Cantilena and M Levine
Department of Nutrition, National Institutes of Health, Bethesda, MD 20892-1372, USA.

To conduct an inpatient study on the recommended dietary allowance (RDA) for vitamin C, we developed a unique vitamin C-deficient diet using a nutrient database and selective menus. Fourteen different menus were developed offering > 300 items with 0-2.4 mg vitamin C per serving. During the 4-6 mo volunteers were hospitalized, daily dietary vitamin C was restricted to < or = 5.0 mg. The mean daily dietary vitamin C intake was < 3.9 mg for the seven study subjects. With concurrent supplementation, the diet provided > or = 85% of the RDA for 17 essential nutrients. Within 3 wk of admission the diet induced vitamin C deficiency as indicated by plasma concentrations, which decreased from 23 +/- 6.9 to 6.9 +/- 2.0 mumol/L. Daily intake of vitamin C and five other nutrients was determined by nutrient database analyses. Mean energy, protein, the iron were 105-185% of the RDA and total and saturated fat were 32% and 10% of energy, respectively. Weight and nutritionally relevant indexes remained normal. Dietary adherence, calculated by the number of days with < or = 5.0 mg vitamin C per total study days, was 88-98% per repletion dose. Computer analyses of menu selections permitted individual preferences to be met while restricting vitamin C intake to < or = 5.0 mg/d. There were no complications from the diet during the depletion and repletion phase. With this diet, ascorbic acid pharmacokinetics for escalating doses could be determined in healthy volunteers.


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M. Levine, Y. Wang, S. J. Padayatty, and J. Morrow
A new recommended dietary allowance of vitamin C for healthy young women
PNAS, August 14, 2001; 98(17): 9842 - 9846.
[Abstract] [Full Text] [PDF]


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Copyright © 1997 by The American Society for Nutrition