Abstract
Purpose
Dietary intake is a primary source of cadmium (Cd) exposure in the non-smoking population. Plant foods containing metal-binding plant compounds such as polyphenols, phytates, and phytochelatins may reduce Cd bioavailability and result in lower Cd body burden. In this study, we investigated the association between plant food intake and urinary creatinine-adjusted Cd (uCd), a well-established marker of Cd body burden.
Methods
Participants were from a cross-sectional sample of 1901 adults in the REasons for Geographic and Racial Differences in Stroke (REGARDS) cohort. Dietary intake was assessed with a food frequency questionnaire. We created a 12-point plant food score (PFS) based on reported intake across seven categories (fruits, vegetables, legumes, nuts/seeds, whole grains, tea, and wine). Higher scores indicated higher consumption and diversity of plant food intake. Multivariable linear regression models were used to estimate the association between PFS and uCd. Due to the influence of age and smoking on Cd status, stratified analyses were conducted.
Results
Mean PFS was 5.4 (SD 2.2) and mean uCd was 0.53 µg/g creatinine (SD 0.39). In adjusted models, PFS was not associated with uCd (p > 0.05). In stratified analyses, PFS was inversely associated with uCd (p = 0.047) with a 1-point higher PFS associated with 0.018 µg/g lower uCd among middle-aged (45–59) adults. No significant association was observed between PFS and uCd in older (≥ 60) adults. The association of PFS and uCd did not differ by smoking status.
Conclusion
Our findings suggest higher plant food intake is associated with lower Cd body burden in middle-aged but not older adults.
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Acknowledgements
The authors thank the other investigators, the staff, and the participants of the REGARDS study for their valuable contributions. A full list of participating REGARDS investigators and institutions can be found at http://www.uab.edu/soph/regardsstudy/.
Funding
The REGARDS research project is supported by a cooperative agreement U01 NS041588 co-funded by the National Institute of Neurological Disorders and Stroke (NINDS) and the National Institute on Aging (NIA), National Institutes of Health, Department of Health and Human Services. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NINDS or the NIA. Representatives of the NINDS were involved in the review of the manuscript but were not directly involved in the collection, management, analysis or interpretation of the data. Additional funding was provided by the National Institute of Environmental Health Sciences (NIEHS, R01 ES021735). Representatives from NIEHS did not have any role in the design and conduct of the study, the collection, management, analysis, and interpretation of the data, or the preparation or approval of the manuscript. The work of KD was supported by research grants from the NIH (T32 DK007734, F31 ES030980).
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All authors were responsible for the study conceptualization and design. KD was responsible for the data analysis. All authors contributed to the interpretation of the results. The manuscript was drafted by KD with input and critical revision from TH and DJ. All authors contributed to the final manuscript.
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Dennis, K.K., Judd, S.E., Alvarez, J.A. et al. Plant food intake is associated with lower cadmium body burden in middle-aged adults. Eur J Nutr 60, 3365–3374 (2021). https://doi.org/10.1007/s00394-021-02513-3
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DOI: https://doi.org/10.1007/s00394-021-02513-3