Helena Joyce
Iodine is a naturally occurring element that is essential for human and animal health. It is primarily found in seawater and is used in disinfectants, medicines, and food supplements. While iodine deficiency can lead to developmental delays and other health problems, excess iodine is also detrimental to health and has been linked to autoimmune thyroid disease. The increase in atmospheric iodine due to pollution and climate change has led to a rise in global iodine levels, with potential health implications. This raises the question of whether iodine itself can be considered a form of pollution.
| Characteristics | Values |
|---|---|
| Iodine Deficiency | Interferes with normal brain development in offspring |
| Iodine Deficiency | Increases vulnerability to nitrate, thiocyanate, and perchlorate |
| Iodine Excess | A risk factor for autoimmune thyroid disease |
| Iodine | Naturally occurring |
| Iodine | Used as a disinfectant for cleaning surfaces and storage containers |
| Iodine | Used in medicines, soaps, bandages, and water purification |
| Iodine | Added to food, such as table salt, to prevent iodine deficiency |
| Iodine | Used in the chemical industry for making inks, colouring agents, and chemicals for photography |
| Iodine | Used in the chemical industry for making batteries, fuels, and lubricants |
| Iodine | Safe for most people when consumed in doses less than 1100 mcg daily |
| Iodine | Possibly unsafe when consumed in high doses, especially for pregnant women |
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What You'll Learn
- Iodine deficiency disorders (IDDs) are preventable with supplements
- Excess iodine is an environmental risk factor for autoimmune thyroid disease
- Iodine is used to disinfect surfaces, purify water, and in medicines
- Global warming and climate change are increasing iodine levels
- Iodine deficiency can cause developmental delays and mental retardation
Iodine deficiency disorders (IDDs) are preventable with supplements
Iodine is a naturally occurring element that is essential for the good health of humans and animals. Humans, however, cannot produce iodine, so it must be consumed. Iodine is used by the thyroid to produce thyroid hormones, which help the body regulate sweat and generate body heat.
Iodine deficiency occurs when the body does not get enough iodine, leading to a lack of thyroid hormones. This can cause hypothyroidism, a condition in which the body cannot produce enough thyroid hormones, and an enlarged thyroid, also known as a goiter. Other symptoms of iodine deficiency include hair loss, dry and flaky skin, fatigue, dizziness, and an abnormally slow heart rate.
Iodine deficiency is a preventable and treatable health problem. It is rare in the United States, but common in other parts of the world, especially among pregnant and breastfeeding women, children, and people in regions far from the sea and at higher altitudes. The best way to prevent and treat iodine deficiency is to increase iodine intake through food or supplements.
Iodine-rich foods include seafood (especially seaweed), dairy products, certain types of bread, eggs, fruits, vegetables, and meat, and iodized salt. Additionally, iodine supplements, including iodized salt, are effective for preventing and treating iodine deficiency. It is recommended to take an iodine supplement of 150 micrograms per day, but it is important not to exceed the recommended dose without proper medical supervision as high intake can increase the risk of side effects.
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Excess iodine is an environmental risk factor for autoimmune thyroid disease
Iodine is a naturally occurring element that is essential for the good health of people and animals. It is found in small amounts in seawater and certain rocks and sediments. Iodine is also added to table salt to ensure that people have enough of the element in their bodies to produce thyroid hormones.
Thyroid hormones play a central role in the intermediary metabolism of almost all tissues and are crucial for the development of the central nervous system in foetuses and newborns. Iodine deficiency can lead to developmental delays, mental retardation, and many other health problems.
To combat iodine deficiency, universal salt iodization (USI) has been implemented globally. USI is a strategy recommended by the World Health Organization (WHO) and UNICEF to ensure adequate dietary iodine by adding potassium iodate to salt.
However, while iodine deficiency disorders have decreased, iodine excess has become a more frequent occurrence due to extensive environmental iodine exposure and poor monitoring. Iodine excess has been linked to the development of autoimmune thyroid disease, including autoimmune thyroiditis, in humans and animals.
Several mechanisms have been proposed to explain how excess iodine contributes to autoimmune thyroid disease:
- Excess iodine induces the production of cytokines and chemokines, which recruit immunocompetent cells to the thyroid.
- Processing excess iodine in thyroid epithelial cells can result in elevated levels of oxidative stress, causing harmful lipid oxidation and thyroid tissue injuries.
- Iodine incorporation into the protein chain of thyroglobulin may increase the molecule's antigenicity.
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Iodine is used to disinfect surfaces, purify water, and in medicines
Iodine is a naturally occurring element that is essential for the good health of people and animals. It is found in small amounts in seawater, rocks, and sediments. Iodine is primarily used as a disinfectant for cleaning surfaces and storage containers. Its antimicrobial properties make it effective in killing bacteria, fungi, and other microorganisms. Iodine is also used to disinfect water, especially in areas where municipal water treatment is unreliable.
Iodine is an essential component of thyroid hormones. Humans cannot produce iodine, so it must be consumed through foods such as seaweed or iodized salt. Iodine deficiency can lead to goitre and thyroid disorders. However, excess iodine ingestion can also cause thyroid problems, particularly hypothyroidism, and there is ongoing debate about the maximum safe dose and duration of use.
Iodine is used in various medical applications. It can be applied topically to treat wounds, diabetic foot ulcers, and leg sores caused by poor circulation. Iodine solutions are used as a vaginal wash before Caesarean deliveries to reduce the risk of uterine swelling. Iodine eye drops can help prevent and treat pink eye, and it is also used to prevent infections during surgery.
Additionally, iodine is used in the chemical industry for making inks, colouring agents, and chemicals for photography, as well as in the production of batteries, fuels, and lubricants.
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Global warming and climate change are increasing iodine levels
Iodine is a naturally occurring element that is essential for the good health of people and animals. Humans cannot produce iodine, so it must be consumed. It is commonly added to table salt and animal feeds to ensure that people and animals have enough iodine in their bodies to form essential thyroid hormones. Iodine is also used in medicines, soaps, bandages, and for purifying water.
While iodine is essential for life, it is unclear what the consequences of increased global iodine levels will be. Global warming and climate change are contributing to rising iodine levels. This is due to the reaction of ozone (O3) from natural and anthropogenic pollution sources with iodide (I-) present in the oceans and in seaweeds (macro- and microalgae) in coastal waters, producing gaseous iodine (I2). The increase in iodine levels has been particularly notable in the North Atlantic since the mid-20th century, with a 33% increase in ocean iodine emissions over this period.
The increase in iodine emissions is also influenced by the lowering of ocean pH due to increased carbon dioxide (CO2) levels. As ocean temperatures rise and the water becomes more acidic, iodine is more easily released. However, these changes can also have the opposite effect, as seen in the decline of kelp forests in Tasmania due to warming ocean waters.
While the increase in iodine levels may have potential benefits for global iodine supply and thyroidal health, it is important to recognize that global warming and climate change are not the primary causes of increased iodine supply. The primary driver of increased iodine is the reaction of ozone with iodide from natural and anthropogenic sources. Additionally, the consequences of increased iodine levels in the atmosphere and deposited in rain are still unknown.
Overall, while global warming and climate change are contributing factors to rising iodine levels, the full implications of this increase are yet to be understood, and addressing the underlying causes of climate change remains a critical priority.
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Iodine deficiency can cause developmental delays and mental retardation
Iodine is a naturally occurring chemical element that is essential for the good health of people and animals. It is found in small amounts in seawater, certain rocks, and sediments. Iodine is necessary for the production of thyroid hormones, which regulate metabolism, growth, and development.
Iodine deficiency occurs when the body does not get enough iodine from the diet, leading to insufficient thyroid hormone production. This can be due to various factors, including living in areas far from water or at higher altitudes, where seafood or dairy consumption is low, and where iodized salt is not commonly used.
Iodine deficiency during pregnancy and early childhood can have severe consequences for the developing fetus and young child, including developmental delays and intellectual disabilities. The thyroid hormones produced with sufficient iodine intake are critical for brain development, and their absence can lead to a range of issues.
Children born to iodine-deficient mothers are more likely to suffer from developmental problems, including physical and mental delays, deafness, severe muscle tightness, and short stature. In severe cases of iodine deficiency during pregnancy, a condition called cretinism can develop in the offspring, resulting in permanent intellectual disability, neurologic defects, and growth abnormalities.
Iodine deficiency is a preventable public health issue. The most common and effective way to prevent and treat iodine deficiency is through the use of iodized salt. Global efforts to promote iodine supplementation, such as universal salt iodization, have made significant progress in reducing iodine deficiency worldwide.
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Frequently asked questions
Iodine is a naturally occurring element that is essential for the good health of people and animals. It is found in small amounts in seawater, certain rocks, and sediments.
Iodine is not a pollutant. In fact, it is essential for the production of thyroid hormones in humans and animals. However, iodine deficiency or excess can lead to health issues.
Iodine deficiency can interfere with normal brain development and increase vulnerability to certain environmental pollutants. It can also lead to developmental delays, mental retardation, and other health problems.
Excess iodine can lead to autoimmune thyroid disease and has been linked to the development of autoimmune thyroiditis in humans and animals. It can also cause side effects such as a metallic taste, soreness of teeth and gums, burning in the mouth and throat, and stomach upset.
