Iodine: The Most Misunderstood Supplement For Your ThyroidAugust 6, 2018
How Do You Know If You Have Fatty Liver?August 13, 2018
Are you getting too much or too little iodine? We often refer to iodine as the “goldilocks” nutrient of your thyroid. Not too much, not too little, things need to be just right to secure your long-term health. Let’s dive into what that means, and how you can achieve it with easy, actionable changes…
Iodine is one of the nutrients that your thyroid needs to thrive (1). Healthy daily iodine intake is set at 150 micrograms per day1. If you are on thyroid medication, you can obtain your iodine through your thyroid medication. You really will not need to bring large amounts into your diet and would do well to limit extra iodine.
The Effects of Low-Iodine Diets
The low iodine diet is typically used when preparing for radioactive iodine testing or treatment (2). The idea behind this diet is that when you keep your levels of iodine very low, your thyroid gland will more readily take up the radioactive iodine once you receive it.
Key Insight: For this purpose, a low-iodine diet is defined as under 50 micrograms of iodine per day2.
A review of current studies demonstrates that a strict or moderate low iodine diet results in higher ablation rates (higher success rates of treatment) than a normal diet3. Further studies are needed to determine the long-term effects of the low iodine diet on treatment outcomes.
The usefulness of a low-iodine diet is demonstrated in an interesting case study of a young woman with papillary thyroid cancer. After being diagnosed, she had a total thyroidectomy. This was to be followed by an ablation. The pre-ablation scan did not show elevated thyroid activity which did not make sense based on the results of previous imaging and biopsy.
This led the patient to admit she had not been compliant with the recommended low iodine diet. This is important because the pre-ablation scan is used to determine the treatment dose of radioactive iodine, check for malignancies, and suggest prognosis and you want to avoid getting a false imaging result.
Bottom Line: All in all, the patient then followed a low-iodine diet, repeated her scan and was able to continue with thyroid ablation treatment.
Can A Low-Iodine Diet Help with Hashimoto’s?
When a group of unmedicated patients with Hashimoto’s thyroiditis was placed on an iodine-restricted diet, they had a much higher recovery rate to a euthyroid state than a group of patients with Hashimoto’s thyroiditis who were not placed on an iodine-restricted diet4.
These results were seen after three months. The patients who had not reached a euthyroid state by three months of a low iodine diet still saw improvements in their TSH levels4.
Similarly, a larger study of iodine restriction in patients diagnosed with subclinical hypothyroidism also found that a low iodine diet for three to six months significantly reduced TSH levels5.
Interested in learning more about how your thyroid works? Here’s where you should start…
How To Enjoy A Low-Iodine Diet
Doing a low-iodine diet may seem daunting at first but if you stick to whole, unprocessed foods you’ll realize how simple it can be.
On a low-iodine diet, you can eat a variety of fresh meats along with vegetables, fruits, grains, unsalted, unprocessed nuts and a variety of herbs and spices.
Foods To Include
- Fresh meat
- Unsalted, unprocessed nuts
- Egg whites
- Alternative milks (almond, hemp, rice, coconut)
- Non-iodized salt
- Fresh or dried herbs and spices
- Honey 2,6
Foods To Avoid
- Processed foods
- Cured meats
- Dairy products
- Egg yolks (egg whites are okay)
- Fish and shellfish
- Seaweed and thickeners
- Soy products
- Breads and baked goods containing calcium iodate or potassium iodate
- Red dye #3
- Blackstrap molasses
- Herbal supplements2,6
You will need to check your supplements for iodine content and potentially eliminate calcium, multivitamin, selenium and fish oil supplements.
A few other places iodine can be hiding are lotions made with seaweed products, water purification tablets, and toothpaste (if containing alginates).
Need supplements you can trust? You can find them in Daily Reset Packs…
Bottom Line: It will be easiest to prepare your own food at home rather than eating out at restaurants, where there may be hidden sources of iodine.
This diet is intended to be followed for the two weeks preceding radioactive iodine testing or treatment. This appears to be sufficient for creating an iodine deficient state for treatment as long as you are careful to follow the diet guidelines3.
A Word Of Caution
Due to the changes, you will be making in order to follow a low iodine diet, you may run into a couple deficiencies. The first is low EPA, an omega 3 fatty acid. EPA is found in fish and fish products, which are avoided during the low iodine diet.
Another is sodium. Severe sodium deficiency has been reported a handful of times in the scientific literature7-9. This is more of a concern in elderly patients or patients on certain diuretic drugs.
However, a recent study found that overall, low iodine diets are not a risk factor for sodium deficiency and that this is not a common outcome for people on a low iodine diet10. Also, recall that you can have salt on the low-iodine diet as long as it is non-iodized salt.
Ready To Try Low-Iodine?
Get ready to jump right in with this sample meal plan! This covers one week of meals, and you can repeat this for four weeks.
Get Started Today
Curious to know if a low-iodine diet is for you? Start with the Thyroid Quiz (2), and gain a clearer picture about the state of your thyroid, your overall health, and the things you can do to start living better right away.
1 – Medicine, I. of. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. (National Academies Press, 2001). doi:10.17226/10026
2 – Nih CC. Low-Iodine Diet: Preparing to Receive Radioactive Iodine.
3 – Li, J. H., He, Z. H., Bansal, V. & Hennessey, J. V. Low iodine diet in differentiated thyroid cancer: a review. Clin. Endocrinol. (Oxf). 84, 3–12 (2016).
4 – Kasagi, K., Iwata, M., Misaki, T. & Konishi, J. Effect of Iodine Restriction on Thyroid Function in Patients with Primary Hypothyroidism. Thyroid 13, 561–567 (2003).
5 – Yoon, S. J. et al. The Effect of Iodine Restriction on Thyroid Function in Patients with Hypothyroidism Due to Hashimoto’s Thyroiditis. Yonsei Med. J. 44, 227 (2003).
6 – Low Iodine Diet | American Thyroid Association. Available at: https://www.thyroid.org/low-iodine-diet/. (Accessed: 24th June 2018)
7 – Al Nozha, O., Vautour, L. & How, J. Life-Threatening Hyponatremia Following a Low-Iodine Diet: A Case Report and Review of all Reported Cases. Endocr. Pract. 17, e113–e117 (2011).
8 – Krishnamurthy, V. R. & McDougall, I. R. Severe Hyponatremia: A Danger of Low-Iodine Diet. Thyroid 17, 889–892 (2007).
9 – Kim, S. K. et al. Severe Hyponatremia Following Radioactive Iodine Therapy in Patients with Differentiated Thyroid Cancer. Thyroid 24, 773–777 (2014).
10 – Kim, J. et al. Preparation for radioactive iodine therapy is not a risk factor for the development of hyponatremia in thyroid cancer patients. Medicine (Baltimore). 96, e6004 (2017).