Why This Thyroid Condition Poses a Crucial Public Health Concern

Editor’s Note: This article is a reprint. It was originally published July 23, 2018.

Iodine deficiency and the thyroid conditions related to it are a serious public health concern. Several studies published earlier this year suggest iodine deficiency is re-emerging. While about 40% of the world’s population is thought to be at risk of iodine deficiency,¹ residents of developed countries are increasingly found to be lacking this essential nutrient. Your body cannot produce iodine so you must get if from your diet. Iodine is necessary to make thyroid hormones, which control your metabolism and other vital functions. Because your thyroid hormones also support proper bone and brain development in utero and during infancy, the proper intake of iodine is critically important for pregnant women, nursing mothers and their babies.

What Is Iodine and Why Is It Important?

As mentioned, iodine is an essential element needed for the production of thyroid hormone. Because your body does not make iodine, you need to be intentional to ensure you obtain sufficient amounts of this nutrient on a daily basis. Although iodine can be sourced from the foods you eat or through a supplement, many people eating a standard American diet generally get enough iodine simply by using table salt. I’ll say more about salt later in the article. When your body lacks sufficient iodine, it cannot make enough thyroid hormone. If your deficiency is severe, your thyroid may become enlarged, a condition also known as a goiter. Iodine deficiency can also cause hypothyroidism (low thyroid function). In some cases, lack of sufficient iodine can trigger intellectual disabilities and developmental problems in infants and children whose mothers were iodine deficient during pregnancy.² According to the American Thyroid Association, iodine deficiency has also been linked to “increased difficulty with information processing, diminished fine motor skills, extreme fatigue, depression, weight gain and low basal body temperatures, among other things.”³

Studies Highlight Iodine Deficiency as an Emerging Problem

A 2018 study published in the journal Nutrients⁴ involving 1,007 mothers who gave birth to 1,017 children (including 10 twin pairs; multiple births other than twins were excluded), suggests iodine deficiency is a significant public health issue in Norway. After collecting data multiple times during pregnancy, at birth and during four follow-up points until the babies reached age 18 months, the researchers concluded: “[T]his study adds to the increasing evidence that pregnant women in Norway are iodine deficient and that the diet of pregnant women does not secure a sufficient iodine intake. There is an urgent need for public health strategies to secure adequate iodine nutrition among pregnant women in Norway.”

Another body of 2018 research, published in JAMA,⁵ implicated iodine deficiency as a factor associated with impaired fertility. The study included 467 American women who were trying to become pregnant during a four-year span. The researchers, who were associated with the National Institutes of Health, found:⁶

• Slightly more than 44% of the women had urinary iodine to creatinine ratios (UI/Cr) of less than 50 micrograms (mcg)/gram (g)
• Women with UI/Cr ratios lower than 50 mcg/g had a 46% lower chance of becoming pregnant in any menstrual cycle compared to women with normal iodine levels or those suffering from a mild deficiency
• Those experiencing milder iodine deficiencies — between 50 and 99 mcg/g — also took longer to conceive than women with healthy iodine levels, although the difference wasn’t statistically significant

An earlier study published in 2013⁷ found children of women with a UI/Cr ratio of less than 150 mcg/g during pregnancy were more likely to have lower scores on verbal IQ, reading accuracy and reading comprehension at age 8.

Iodine Is Essential During the First 1,000 Days of Life

In a March 2018 study published in Nutrients,⁸ researchers from the U.K.’s University of Surrey and Spain’s Hospital Riotinto observed the effects of a mother’s iodine deficiency related to various stages of child development — during pregnancy, breastfeeding and the first two years of life. About the outcomes, Health.News noted:⁹

“[The researchers] observed iodine deficiency could lead to cognitive consequences such as impaired speech development, learning and reading skills. The negative cognitive outcomes caused by iodine deficiency also led to an increase in behavioral disorders. This was associated with abnormal serum thyroid concentrations during the early stages of pregnancy.”

“Iodine is most critical in the early stages of development, as the fetal brain is extremely dependent on iodine supply and it cannot be replaced by any other nutrient,” suggests study coauthor Dr. Ines Velasco from the pediatrics, obstetrics and gynecology unit of Hospital Riotinto. “[A]n adequate iodine intake in pregnancy is needed to achieve optimal fetal neurodevelopment.”

Iodine Deficiency: Its History and Causes

You may associate iodine with salt. There’s a long-standing connection between the two mainly because beginning in the U.S. in 1924, iodine (in the form of potassium iodide) was added to table salt to address the skyrocketing rates of deficiency.¹⁰ Many residents of the Appalachian, Great Lakes and Pacific Northwest regions were plagued by goiters. Due to the lack of iodine in the soil and the alarming rates of thyroid dysfunction found in local populations, these areas became referred to as the “goiter belt.” At the time, the addition of iodine to table salt, which was an idea borrowed from the Swiss who were adding it for the same reasons, had a noticeably positive effect, reducing the prevalence of deficiency.¹¹ Now, decades later, iodine deficiency is once again showing itself to be a problem. About the issue, Dr. Jacob Teitelbaum, author and nationally recognized expert on chronic fatigue syndrome, fibromyalgia, pain and sleep, asserts:¹²

In the last 30 years, the intake of iodine in America has dropped by around 50 percent. Iodine’s main role is to help manufacture thyroid hormones. That’s why a subclinical iodine deficiency — enough to prevent a goiter, but not enough for optimal health — can cause hypothyroidism, an under-recognized condition that is epidemic in America.

Chemicals in Your Environment Can Block Iodine Absorption

While women have a greater incidence of iodine deficiency related to their hormone production, the bodies of both men and women are subject to the poor absorption of iodine and suboptimal use due to environmental contamination. Common contaminants that compete with iodine include:

• Bromide — Bromides are known endocrine disruptors found in baked goods, pesticides and plastics, among other sources. Because bromide is a halide, it competes for the same receptors used in your thyroid gland and other body areas to capture iodine, thereby inhibiting thyroid hormone production and resulting in a deficiency.
• Fluoride — Fluoride has long been known to displace iodine and studies involving both animals and humans have proven such. As cited by the Fluoride Action Network, Chinese researchers “have repeatedly found that an iodine deficiency coupled with fluoride exposure produces a significantly more damaging effect on neurological development than iodine deficiency alone.”13
• Mercury — Iodine may help detoxify your body of mercury, which is found in dental amalgam fillings and fish like tuna, as well as in consumer products such as antiques, batteries, electronics, light bulbs and pharmaceutical products.
• Nitrates — While there are healthy nitrates, such as from vegetables, including beets, the nitrites found in processed meats such as bacon, hot dogs, lunch meat and sausage may interfere with your uptake of iodine, so be sure to avoid them. Nitrates from agricultural fertilizer, present in contaminated drinking water, have also been implicated as a potential cause of thyroid cancer.¹⁴
• Perchlorate — A contaminant found in groundwater across the U.S. and in measurable amounts in milk, fruit and vegetables. In high doses, perchlorate may inhibit the function of your thyroid gland. Even in low doses, it inhibits the uptake of iodine by your thyroid gland, leading to hypothyroidism.^15,16

How Much Iodine Do You Need and How Can You Get It?

According to the National Institutes of Health, the recommended dietary allowance (RDA) for iodine is:¹⁷

I always recommend you get as many nutrients as possible from the food you eat and your intake of iodine is no exception. Always choose fresh, organic fruits and vegetables and raw, organic, grass fed dairy. Below are some of…

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