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Letter to the Editor in response to: Intra-individual and inter-individual variations in iodine intake and excretion in adult women: implications for sampling

Published online by Cambridge University Press:  08 June 2020

Wen Chen
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Shu Gao
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Wenxing Guo
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Long Tan
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Ziyun Pan
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Shuyao Dong
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Ya Jin
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Ying Zhang
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Wanqi Zhang
Affiliation:
Department of Nutrition and Food Hygiene, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
Jun Shen*
Affiliation:
Department of Sanitary Chemistry, School of Public Health, Tianjin Medical University, Tianjin300070, People’s Republic of China
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Abstract

Type
Letter to the Editor
Copyright
© The Authors 2020

We appreciate the opportunity to respond to the letter recently published by Ma(Reference Ma1) regarding our paper in the British Journal of Nutrition (Reference Chen, Gao and Guo2). We believe that Ma(Reference Ma1) makes some points that deserve a clarifying response. First, concern was expressed that we did not discuss the 24-h urinary iodine concentration (UIC) variation for iodine-deficient and iodine-sufficient individuals. In this study, the study objects are college students, according to the WHO to determine the iodine nutritional status of the range of urinary iodine(3), the population is generally at the appropriate level of iodine. In the future, our work will also explore the variation of 24-h UIC in people with iodine deficiency and iodine excess. At the same time, we think that the scope of application is wider than the determination results of iodine-adequate people.

Ma(Reference Ma1) also expressed to consider if the adjustment of UIC by creatinine excretion (iodine:creatinine ratio) could be used to decrease or increase intra- and inter-individual variation of urinary iodine and how this could further influence UIC distribution spread. We think this is a good suggestion, and we have tried to use urinary creatinine as a separate indicator to evaluate children’s iodine nutrition(Reference Chen, Li and Guo4,Reference Wang, Du and Lin5) , but it is not involved in this survey. Our next work will try to use more evaluation indicators to evaluate the iodine nutrition status of different populations.

We appreciate Ma’s interest in our work and the opportunity to conduct alternative analyses to address the stated concerns.

References

Ma, ZF (2020) Letter to the Editor: Intra-individual and inter-individual variations in iodine intake and excretion in adult women: implications for sampling. Br J Nutr 123, 1078.CrossRefGoogle Scholar
Chen, W, Gao, S, Guo, W, et al. (2020) Intra-individual and inter-individual variations in iodine intake and excretion in adult women: implications for sampling. Br J Nutr 123, 987993.CrossRefGoogle ScholarPubMed
World Health Organization/International Council for Control of Iodine Deficiency Disorders/United Nations International Children’s Emergency Fund (2007) Assessment of Iodine Deficiency Disorders and Monitoring their Elimination: A Guide for Programme Managers, 3rd ed.Geneva: WHO.Google Scholar
Chen, W, Li, X, Guo, X, et al. (2017) Urinary iodine excretion (UIE) estimated by iodine/creatinine ratio from spot urine in Chinese school-age children. Clin Endocrinol (Oxf) 86, 628633.CrossRefGoogle ScholarPubMed
Wang, W, Du, C, Lin, L, et al. (2018) Anthropometry-based 24-h urinary creatinine excretion reference for Chinese children. PLOS ONE 13, e0197672.CrossRefGoogle ScholarPubMed