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Associations between concentrations of α- and γ-tocopherol and concentrations of glucose, glycosylated haemoglobin, insulin and C-peptide among US adults

Published online by Cambridge University Press:  08 March 2007

E. S. Ford ,
A. H. Mokdad ,
U. A. Ajani  and
S. Liu
E. S. Ford*
Affiliation:
Division of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, 4770 Buford Highway, MS K66, Atlanta, GA 30341, USA
A. H. Mokdad
Affiliation:
Division of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, 4770 Buford Highway, MS K66, Atlanta, GA 30341, USA
U. A. Ajani
Affiliation:
Division of Adult and Community Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, 4770 Buford Highway, MS K66, Atlanta, GA 30341, USA
S. Liu
Affiliation:
Division of Preventive Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
*
*Corresponding author: Dr E. S. Ford, fax +1 770 488 8150, email eford@cdc.gov
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Abstract

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Our objective was to study the cross-sectional associations between concentrations of α- and γ-tocopherol and concentrations of glucose, glycosylated haemoglobin, insulin and C-peptide among US adults. We used data for 1289 participants without self-reported diabetes who were aged ≥20 years in the National Health and Nutrition Examination Survey 1999–2000. α-Tocopherol concentration was inversely associated with glucose concentration (β per mmol/l=−0·01064, se 0·00356, P=0·004) after adjusting for age, sex, race or ethnicity, education, smoking status, concentrations of total cholesterol and triacylglycerols, systolic blood pressure, waist circumference, alcohol use, physical activity, time watching television or videos or using a computer, and use of vitamin/mineral/dietary supplements. Among 659 participants who did not report using supplements, this association was no longer significant whereas the concentration of α-tocopherol was inversely associated with concentration of C-peptide (β per mmol/l=−0·01121, se 0·00497, P=0·024). γ-Tocopherol concentration was positively associated with concentration of glucose (β per mmol/l=0·09169, se 0·02711, P=0·001) and glycosylated haemoglobin (β per mmol/l=0·04954, se 0·01284, P<0·001), but not insulin or C-peptide. The relationships between physiologic concentrations of the various forms of vitamin E and measures of glucose intolerance deserve additional investigation.

Keywords

C-peptideGlucoseGlycosylated haemoglobinInsulinTocopherol
Type
Research Article
Information
British Journal of Nutrition , Volume 93 , Issue 2 , February 2005 , pp. 249 - 255
Copyright
Copyright © The Nutrition Society 2005

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