Iodine, Seaweed, and the Thyroid.

Area of Science:

• Nutritional science
• Environmental science
• Endocrinology

Background:

• Iodine is crucial for thyroid health; imbalances can lead to disorders.
• Seaweed, increasingly popular in Western diets, is a significant iodine source.
• Gaseous iodine from seaweed influences coastal climate and cloud formation.

Purpose of the Study:

• To outline dietary iodine sources, assessment methods, and intake recommendations.
• To describe the benefits and risks associated with consuming iodine-rich seaweed.
• To discuss seaweed's role in thyroid health, cancer prevalence, and climate impact.

Main Methods:

• Review of scientific literature on iodine metabolism and thyroid function.
• Analysis of seaweed's nutritional content and potential health impacts.
• Examination of studies on gaseous iodine's environmental effects.

Main Results:

• Dietary iodine sources, assessment, and recommended intake are detailed.
• Seaweed consumption offers benefits but carries risks, including antithyroid actions.
• Gaseous iodine from seaweed impacts weather patterns and coastal iodine levels.

Conclusions:

• Universal salt iodization is optimal for iodine status; targeted increases are recommended for specific groups.
• Caution is advised for brown seaweed (kelp) consumption due to potential antithyroid effects.
• Seaweed's environmental iodine contribution may help mitigate local iodine deficits.