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Thyroid function and iodine intake: global recommendations and relevant dietary trends.

Sarah C Bath1

  • 1Department of Nutrition, Food and Exercise Sciences, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK. s.bath@surrey.ac.uk.

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Ensuring adequate iodine intake is crucial for thyroid health and brain development, especially during pregnancy. Global efforts like salt iodization have improved intake, but dietary shifts necessitate continued vigilance.

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Area of Science:

  • Nutrition Science
  • Public Health
  • Endocrinology

Background:

  • Iodine is an essential micronutrient vital for thyroid hormone synthesis.
  • Thyroid hormones are critical for normal brain development, particularly in utero and early childhood.
  • Global iodine deficiency disorders remain a public health concern despite progress.

Purpose of the Study:

  • To review the current status of iodine intake globally.
  • To examine challenges to adequate iodine consumption in light of changing dietary patterns and public health trends.
  • To discuss strategies for ensuring sufficient iodine status across populations.

Main Methods:

  • Comprehensive literature review of iodine nutrition, public health initiatives, and dietary trends.
  • Analysis of global iodine intake data and fortification program effectiveness.
  • Consideration of factors influencing iodine status, including diet, lifestyle, and health recommendations.

Main Results:

  • Salt iodization has significantly improved iodine intake worldwide over the past three decades.
  • Dietary shifts, including reduced dairy consumption and increased plant-based diets, pose risks to iodine status.
  • Growing trends in overweight, obesity, and salt restriction for cardiovascular health further complicate iodine intake management.

Conclusions:

  • Sustained efforts are needed to maintain and improve iodine status, particularly in regions without robust fortification programs.
  • Public health organizations, governments, and clinicians must address variable individual food choices and evolving dietary patterns.
  • Integrating iodine status considerations into broader public health strategies is essential for preventing deficiencies and supporting optimal health outcomes.