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Nutrient Details For : Iodine

A nutrient is any element or compound necessary for or contributing to an organism's metabolism, growth, or other functioning. Click name for details Arsenic Biotin Boron Calcium Carbohydrates Carnitine Carotenoids Chloride Choline Chromium Copper Energy Fiber Fluoride Folate Iodine Iron Lipids Magnesium Manganese Molybdenum Niacin Nickel Pantothenic acid Phosphorus Phyto-chemicals Potassium Protein Riboflavin Selenium Silicon Sodium Thiamin Vanadium Vitamin A Vitamin B 12 Vitamin B 6 Vitamin C Vitamin D Vitamin E Vitamin K Zinc Further Trace Elements

Iodine is a nonmetallic element belonging to the halogen family. Iodine is converted to iodide in the gut, efficiently absorbed in the digestive tract and carried into circulation by serum proteins.

Most iodide is actively trapped by the thyroid gland where, as I2, it forms an essential component of the thyroid hormones. Thyroid hormones regulate cell activity and growth in virtually all tissues and are, therefore, essential for both normal embryonic and postnatal development.

Deficiencies:

Iodine deficiency impairs growth and neurological development, which can damage the brain. Depending on its severity and stage of development at which it occurs, iodine deficiency can lead to a wide spectrum of health problems, ranging from mild intellectual impairment to severe mental retardation, growth stunting, apathy, and impaired movement, speech or hearing. Cretinism, in which many of these abnormalities occur, represents the extreme of early iodine deficiency. It is rare.

Much more widespread is an intellectual blunting that may afflict as many as 50 million of the estimated 1.6 billion "at-risk" people living in iodine deficient regions, making iodine deficiency the most common preventable cause of mental retardation in the world.

Because of decreased production of thyroid hormones, iodine deficiency causes compensatory hypertrophy of the thyroid gland as it attempts to make more thyroid hormone, resulting in a goiter - a disfiguring condition that is common in high risk areas.

Collectively, health problems arising from a lack of iodine are known as iodine deficiency disorders (IDD). Prevention and treatment: Universal salt iodization provides the most effective and affordable means to prevent IDD throughout the world; over 90 countries presently iodize their salt. Typically, the iodine concentration is from 30 to 100 µg per g of salt, levels that take into consideration anticipated losses during transport and storage.

At salt intakes of 5-20 g per day, this fortification range is sufficient to meet requirements in most countries. Other iodizable vehicles include water, grain and dairy products. Iodized oil supplements may be periodically administered in remote areas where salt iodization is not feasible.

Damage to the fetus resulting from maternal iodine deficiency is irreversible.

Most goiters can be cured or reduced in size with iodine therapy.

Recommendations:

The Recommended Dietary Allowance for iodine in the United States is as follows: infants, 40-50 µg; 1-3 yrs, 70 µg; 4-6 yrs, 90 µg; 7-10 yrs, 120 µg; over 11 yrs, 150 µg; pregnancy, 175 µg; and lactation, 200 µg. Globally, the per person iodine requirement is 150-200 µg per day.

Food sources:

Iodine content of food and water depends primarily on the supply of iodine in the soil. Glaciated, mountainous or heavy rainfall areas are likely to be low in iodine placing human and animal populations at risk.

Thus, individuals can not usually improve iodine intake by diversifying their diet.

Some plants, including cabbage, Brussels sprouts, legumes, and cassava contain goitrogenous substances that interfere with iodine absorption. This is of public health concern only where these foods are regularly consumed in large amounts and dietary iodine is low.

Toxicity:

A wide range of iodine intake is tolerated by individuals. For this reason, long term consumption of iodine through iodized salt is considered safe. Chronic, excessive iodine intakes may occasionally lead to goiter and hypothyroidism.

Chemical information on Iodine

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