Relationship of ascorbic acid to blood lead levels.
Context Some animal studies suggest that orally administered ascorbic acid may chelate lead and decrease the risk of the toxic effects of lead.
However, results from several small studies in humans have yielded inconclusive evidence of a beneficial effect of ascorbic acid on lead toxicity.
Objective To examine the relationship between serum ascorbic acid levels and prevalence of elevated blood lead levels.
Design, Setting, and Participants Cross-sectional analysis of a probability sample of the US population enrolled in the Third National Health and Nutrition Examination Survey, 1988-1994 (4213 youths aged 6-16 years and 15 365 adults aged >= 17 years) without a history of lead poisoning.
Main Outcome Measures Elevated and log blood lead levels by serum ascorbic acid level.
Results A total of 22 youths (0.5%) and 57 adults (0.4%) had elevated blood lead levels (defined as >=0.72 mumol/L [15 mug/dL]) and >=0.97 mumol/L [20 mug/dL], respectively).
After controlling for the effects of age, race, sex, income level, and dietary energy, fat, calcium, iron, and zinc intake, youths in the highest serum ascorbic acid tertile had an 89% decreased prevalence of elevated blood lead levels compared with youths in the lowest serum ascorbic acid tertile (odds ratio, 0.11 ; 95% confidence interval, 0.04-0.35 ; P for trend=002). (...)
Mots-clés Pascal : Acide ascorbique, Etude transversale, Association, Sang artériel, Prévalence, Facteur risque, Plomb, Toxicité, Mesure comparative, Résultat, Homme, Américain, Vitamine
Mots-clés Pascal anglais : Ascorbic acid, Cross sectional study, Association, Arterial blood, Prevalence, Risk factor, Lead, Toxicity, Comparison measurement, Result, Human, American, Vitamin
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0366324
Code Inist : 002B02N. Création : 14/12/1999.