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Iodine contributes to normal thyroid function. Iodine occurs naturally in bedrock, but the amount varies greatly between different geographical areas. Sweden is a country with little iodine in its bedrock.
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Iodine is an essential nutrient that the body needs to produce thyroid hormones. Iodine also contributes to normal cognitive function, energy metabolism and the normal function of the nervous system.
Iodine occurs naturally in the bedrock, but the amount varies greatly between different geographical areas. Sweden is a country with little iodine in the bedrock. Iodine is found in various foods, such as fish (especially lean fish), shellfish and algae. Dairy products can also contain iodine if the animals have received iodine through their feed or have had access to iodine-enriched rock salt.
Since 1936, Sweden has been adding iodine to table salt (iodized salt). The absorption of iodine from table salt is only 10–20 percent, since table salt mainly consists of chloride, which is an antagonist to iodine.
Iodine is necessary for the formation of the hormones thyroxine (T4) and triiodothyronine (T3). These hormones are formed in the thyroid gland and regulate metabolism and reproduction, as well as growth and development in children.