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Iodine Deficiency: Causes, Symptoms & Treatment

Iodine deficiency occurs when the body does not receive enough iodine. It can lead to thyroid disorders such as goiter or hypothyroidism.

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Things worth knowing about "Iodine Deficiency"

Iodine deficiency occurs when the body does not receive enough iodine. It can lead to thyroid disorders such as goiter or hypothyroidism.

What is Iodine Deficiency?

Iodine deficiency is a condition in which the body does not receive sufficient iodine to maintain normal physiological functions. Iodine is an essential trace element that the body cannot produce on its own and must therefore obtain through diet. It is primarily needed for the production of thyroid hormones, which regulate a wide range of metabolic processes.

Causes

Iodine deficiency is most commonly caused by insufficient dietary intake. Regions with iodine-poor soils and limited consumption of iodine-rich foods are particularly affected. The main causes include:

Low intake of iodine-rich foods such as saltwater fish, seafood, and dairy products
Living in iodine-deficient areas, such as mountainous regions or landlocked countries
Avoiding iodized salt
Increased iodine requirements during pregnancy and breastfeeding
Certain dietary patterns (e.g., vegan diets without targeted iodine supplementation)
Consumption of goitrogenic substances that inhibit iodine utilization (e.g., raw cabbage or soy)

Symptoms

The symptoms of iodine deficiency depend on the severity and duration of the deficit. Common signs include:

Goiter: Enlargement of the thyroid gland as a compensatory response
Fatigue and exhaustion
Weight gain and slowed metabolism
Feeling cold
Difficulty concentrating and memory problems
Dry skin and brittle hair
In newborns and children: developmental delays and cognitive impairment

Risk Groups

Certain groups of people are particularly at risk of developing iodine deficiency:

Pregnant and breastfeeding women (increased requirements)
Newborns and young children
Individuals following a restricted or vegan diet without targeted supplementation
Residents of iodine-deficient regions without access to iodized salt

Diagnosis

Iodine deficiency is diagnosed through several methods:

Urinary iodine excretion: The most common and reliable test; a value below 100 µg/l is considered deficient in adults
Blood tests measuring thyroid hormone levels (TSH, fT3, fT4)
Thyroid ultrasound to assess size and structure

Treatment and Prevention

Treatment depends on the severity of the deficiency and includes:

Dietary adjustments: Regular consumption of saltwater fish (e.g., cod, salmon), seafood, milk and dairy products, and eggs
Iodized salt: Using iodized salt when cooking and at the table
Supplements: Iodine supplements, especially recommended during pregnancy and breastfeeding (the WHO recommends 150 µg/day for adults, 250 µg/day for pregnant and breastfeeding women)
Thyroid treatment: If goiter or hypothyroidism has already developed, medication or surgery may be necessary

Recommended Daily Intake

The World Health Organization (WHO) recommends the following daily iodine intake:

Infants (0–59 months): 90 µg/day
School-age children (6–12 years): 120 µg/day
Adolescents and adults: 150 µg/day
Pregnant women: 250 µg/day
Breastfeeding women: 250 µg/day

Toxicity and Interactions

Excessive iodine intake can also be harmful to health. Very high doses can trigger thyroid dysfunction, such as hyperthyroidism or autoimmune thyroid disease. People with pre-existing thyroid conditions should consult a doctor before adjusting their iodine intake. The WHO sets the tolerable upper intake level for adults at 1100 µg/day.

References

World Health Organization (WHO): Iodine deficiency disorders. WHO Nutrition, 2023. https://www.who.int/health-topics/malnutrition
Zimmermann MB: Iodine deficiency. Endocrine Reviews, 2009;30(4):376–408. https://doi.org/10.1210/er.2009-0011
National Institutes of Health (NIH), Office of Dietary Supplements: Iodine – Fact Sheet for Health Professionals. NIH, 2023. https://ods.od.nih.gov/factsheets/Iodine-HealthProfessional/

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