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American Journal of Clinical Nutrition, Vol 23, 520-524, Copyright © 1970 by The American Society for Clinical Nutrition, Inc.
1 From the Nutrition Research Division, Food and Drug Directorate, and the Department of Biology, University of Ottawa, Ottawa, Canada
The vitamin C status of 14 cigarette smokers and 14 nonsmokers was evaluated before and after saturation for 6 days with 2.2 g l-ascorbic acid. The smokers' group initially had lower vitamin C blood levels and a lower urinary excretion after a 1.l-g test dose than the nonsmokers, but no difference was found after the saturation and desaturation period; thus, the smokers initially retained more vitamin C.
The relationship between the vitamin C intake and blood levels, or urinary excretion of the first test dose, indicated that the differences in the vitamin C status were not due to different intakes.
The vitamin C excreted during 8 hr after a 1.l-g load correlated well with the vitamin C intake of the nonsmokers and with the blood vitamin C levels of both smokers and nonsmokers. This type of load test should be useful for determining the vitamin C status of individuals.
Following elimination of excess vitamin C after saturation, intakes of vitamin C ranging from about 60 to 95 mg were given twice a day for 3 days, and it was found that in general the smokers excreted 40% less vitamin C than the nonsmokers. This indicates that less vitamin C is effectively available for utilization by the smokers, or that the smokers are utilizing vitamin C differently.
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