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Vegans and vegetarians living in Nottingham (UK) continue to be at risk of iodine deficiency

Eveleigh, Elizabeth; Coneyworth, Lisa; Zhou, Mi; Burdett, Hannah; Malla, Jhama; Nguyen, Van Hoang; Welham, Simon

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Authors

Elizabeth Eveleigh

Mi Zhou

Hannah Burdett

Jhama Malla

Van Hoang Nguyen



Abstract

Iodine is essential for thyroid hormone synthesis. Individuals adhering to vegan and vegetarian diets have been found to be vulnerable to iodine deficiency. Yet, iodine has not been monitored in these groups across time. This study aims to investigate iodine status, intake and knowledge in vegans, vegetarians, and omnivores and determine changes between 2016-17 and 2019. Dietary intake (μg day-1) was estimated by three-day food diaries (FD), and iodine food frequency questionnaires (FFQ). Urinary iodine concentration (UIC), analysed by ICP-MS, assessed iodine status according to World Health Organisation (WHO) criteria. Iodine knowledge was scored by an adapted questionnaire. IBM SPSS was used for statistical analysis. Ninety-six adults (18-60 y) were recruited in October 2016-17 (vegans; 12, vegetarians; 5, omnivores; 43) and June 2019 (vegans; 7, vegetarians; 10, omnivores; 19). Median dietary iodine was below the Reference Nutrient Intake (RNI) for all groups. Vegans and vegetarians had the lowest iodine intake. Vegans had significantly lower iodine intake than omnivores (2016-17; P = 0.032, 2019; P = 0.001). Omnivores had the highest iodine status (2016-17; 79.4 μg L-1, 2019; 72.4 μg L-1), and vegans the lowest (2016-17; 31.2 μg L-1, 2019; 12.2 μg L-1). Iodine knowledge was poor, but did not differ between dietary groups (2016-17; P = 0.219, 2019; P = 0.532). Vegans and vegetarians continue to be at risk of iodine deficiency. Further, iodine intake in the UK is poor independent of dietary choice. Iodine education is needed along with, research into improving iodine nutrition at national level.

Citation

Eveleigh, E., Coneyworth, L., Zhou, M., Burdett, H., Malla, J., Nguyen, V. H., & Welham, S. (2023). Vegans and vegetarians living in Nottingham (UK) continue to be at risk of iodine deficiency. British Journal of Nutrition, 129(9), 1510-1527. https://doi.org/10.1017/S0007114522000113

Journal Article Type Article
Acceptance Date Jan 11, 2022
Online Publication Date Jan 21, 2022
Publication Date May 14, 2023
Deposit Date Jan 20, 2022
Publicly Available Date Jan 22, 2023
Journal British Journal of Nutrition
Print ISSN 0007-1145
Electronic ISSN 1475-2662
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 129
Issue 9
Pages 1510-1527
DOI https://doi.org/10.1017/S0007114522000113
Public URL https://nottingham-repository.worktribe.com/output/7280458
Publisher URL https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/vegans-and-vegetarians-living-in-nottingham-uk-continue-to-be-at-risk-of-iodine-deficiency/36BCCA8592CEA48834E2FB32A4A5521F

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