Iodine is an essential mineral commonly found in seafood.
Your thyroid gland uses it to make thyroid hormones, which help control growth, repair damaged cells and support a healthy metabolism.
Unfortunately, up to a third of people worldwide are at risk of an iodine deficiency Those at the highest risk include
- Pregnant Women
- People who live in countries where there is very little iodine in the soil. This includes Australia, New Zealand, South Asia, Southeast Asia, and European countries
- People who don’t use iodized salt
- People who follow a vegetarian or vegan diet
Iodine deficiency can cause uncomfortable and even severe symptoms. They include swelling in the neck, pregnancy complications, cognitions issues and weight gain.
The symptoms are very similar to those ofhypothyroidism, or low thyroid hormones. Since iodine is used to make thyroid hormones, an iodine deficiency means your body can’t make enough of them, leading to hypothyroidism.
People must also be careful not to over supplement with iodine. Excess levels without selenium is associated withincreased thyroid autoimmunity, so you must be careful not to over supplement your iodine intake. I always get my hypothyroid patients run a iodine, selenium and tyrosine test to ensure optimal levels.
Here are 10 signs and symptoms of an iodine deficiency.
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1. Unexpected Weight Gain
Unexpected weight gain is another sign of an iodine deficiency. It may occur if the body does not have enough iodine to make thyroid hormones.
This is because thyroid hormones help control the speed of your metabolism, which is the process by which your body converts food into energy and heat.
When your thyroid hormone levels are low, your body burns fewer calories at rest. Unfortunately, this means more calories from the foods you eat are stored as fat.
Adding more iodine to your diet may help reverse the effects of a slow metabolism, as it can help your body make more thyroid hormones.
2. Swelling of The Neck
Swelling in the front of the neck is the most common symptom of an iodine deficiency. This is called a goiter and occurs when the thyroid gland grows too big.
The thyroid gland is a small, butterfly-shaped gland in the front of your neck. It makes thyroid hormones upon receiving a signal from the thyroid-stimulating hormone (TSH).
When blood levels of TSH rise, the thyroid gland uses iodine to make thyroid hormones. However, when your body is low in iodine, it can’t make enough of them.
To compensate, the thyroid gland works harder to try to make more. This causes the cells to grow and multiply, eventually leading to a goiter.
Fortunately, most cases can be treated by increasing your iodine intake. However, if a goiter hasn’t been treated for many years, it might cause permanent thyroid damage.
3. Hair Loss
Thyroid hormones help control the growth of hair follicles. When your thyroid hormone levels are low, your hair follicles may stop regenerating. Over time, this may result in hair loss. For this reason, people with an iodine deficiency may also suffer from hair loss.
One studyin 700 people found that 30% of those with low thyroid hormone levels experienced hair loss.
If you experience hair loss because of an iodine deficiency, getting enough of this mineral may help correct your thyroid hormone levels and stop hair loss.
4. Fatigue
Fatigue and weakness are common symptoms of an iodine deficiency. These symptoms occur because thyroid hormones help the body make energy.
When thyroid hormone levels are low, the body can’t make as much energy as it usually does. This may cause your energy levels to plummet and leave you feeling weak.
A 2017 studyin 2,456 people found that fatigue and weakness were the most common symptoms among those with low or slightly low thyroid hormone levels.
When people are fatigued it causes them to seek out high amounts of calories in the form of processed food. This helps to boost energy levels slightly, however, it leads to significant weight gain. Fatigue also lowers people’s ability to exercise, exacerbating the weight gain.
5. Feeling Colder Than Usual
Feeling cold is a common symptom of an iodine deficiency.
As iodine is used to make thyroid hormones, an iodine deficiency can cause your thyroid hormone levels to plummet. Given that thyroid hormones help control the speed of your metabolism, low thyroid hormone levels may cause it to slow down. A slower metabolism generates less heat, which may cause you to feel colder than usual.
Also, thyroid hormones help boost the activity of your brown fat, a type of fat that specializes in generating heat. This means that low thyroid hormone levels, which may be caused by an iodine deficiency, could prevent brown fat from doing its job.
6. Dry, Flaky Skin
Dry, flaky skin may affect many people with an iodine deficiency.
Thyroid hormones, which contain iodine, help your skin cells regenerate. When thyroid hormone levels are low, this regeneration doesn’t occur as often, possiblyleading to dry, flaky skin.
Additionally, thyroid hormoneshelp the body regulate sweat. People with lower thyroid hormone levels, such as those with an iodine deficiency, tend to sweat less than people with normal thyroid hormone levels.
Given that sweat helps keep your skin moist and hydrated, a lack of sweat may be another reason why dry, flaky skin is a common symptom of iodine deficiency.
7. Changes in Heart Rate
Your heart rate is a measure of how many times your heart beats per minute. It may be affected by your iodine levels. Too little of this mineral could cause your heart to beat slower than usual, while too much of it could cause your heart to beat faster than usual.
A severe iodine deficiency may cause an abnormally slow heart rate. This could make you feel weak, fatigued, dizzy and possibly cause you to faint.
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8. Heavy or Irregular Periods
Heavy and irregular menstrual bleeding may occur asa result of an iodine deficiency. Like most symptoms of iodine deficiency, this is also related to low levels of thyroid hormones, given that iodine is needed to make thyroid hormones.
In one study, 68% of women with low thyroid hormone levels experienced irregular menstrual cycles, compared to only 12% of healthy women.
Research also shows that women with low thyroid hormone levels experience more frequent menstrual cycles with heavy bleeding. This is because low thyroid hormone levels disrupt the signals of hormones that are involved in the menstrual cycle.
9. Issues With Learning and Memory
An iodine deficiency may affect your ability to learn and remember.
A study includingover 1,000 adults found that those with higher thyroid hormone levels performed better on learning and memory tests, compared to those with lower thyroid hormone levels.
Thyroid hormones help your brain grow and develop. That’s why an iodine deficiency, which is required to make thyroid hormones, can reduce brain development.
In fact,studies have foundthat the hippocampus, the part of the brain that controls long-term memory, appears to be smaller in people with low thyroid hormone levels.
10. Pregnancy Complications
Pregnant women are at a high risk of iodine deficiency.
This is because they need to consume enough to meet their own daily needs, as well as the needs of their growing baby. The increased demand for iodine continues throughout lactation, as babies receive iodine through breast milk.
Not consuming enough iodine throughout pregnancy and lactation may cause side effects for both the mother and baby.
Mothers may experience symptoms of an underactive thyroid, such as a goiter, weakness, fatigue and feeling cold. Meanwhile, an iodine deficiency in infants maystunt physical growth and brain development.
Furthermore, a severe iodine deficiency mayincrease the risk of stillbirth.
You can see that Iodine is an essential nutrient and plays critical roles in metabolism, energy and reproduction. This critical nutrient is so vital that I reccomend most of my patients perform an Iodine test, especially if you are suffereing from hypothyroidism or planning on becoming pregnant.
Food Sources of Iodine
Food | Iodine content (µg per 100g) |
Oysters | 160 |
Sushi (containing seaweed) | 92 |
Tinned salmon | 60 |
Bread (made with iodised salt) | 46 |
Steamed snapper | 40 |
Cheddar cheese | 23 |
Eggs | 22 |
Ice cream | 21 |
Chocolate milk | 20 |
Flavoured Yoghurt | 16 |
Regular milk | 13 |
Tinned tuna | 10 |
Bread (without iodised salt) | 3 |
Beef, pork, lamb | <1.5 |
Tap water (varies depending on site) | 0.5-20.0 |
Apples, oranges, grapes, bananas | <0.5 |
Iodine recommendations in Australia and New Zealand
Age and Gender | RDI |
1-8yrs boys and girls | 90µg/day |
9-13yrs boys and girls | 120 µg/day |
14-18yrs boys and girls | 150µg/day |
19->70yrs men | 150µg/day |
19->70yrs women | 150µg/day |
Pregnancy | 220µg/day |
Lactation | 270 µg/day |
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Kayla Mignone
Kayla’s personal experience with thyroid issues, autoimmune conditions, and digestive complaints, brings a wealth of experience to her academic career and personal consultations. Her passion came from the inability to find help in the mainstream medical community. Using scientifically-proven natural health protocols, Kayla helps people navigate their health issues and has dedicated her career to helping her patients take control of their health.
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