I suspect that there is actually enough iodine in the environment to go around, and that we actually need less than 150 micrograms per day of iodine. From the above list, you can see that animal foods are much richer in iodine than plant foods—so how do herbivores (animals which eat a plant-based diet, such as rabbits and deer) get enough iodine? I suspect that there is something about the human diet which interferes with our ability to absorb, utilize, and/or retain iodine, and that this is why we appear to be iodine-deficient compared to other animals. So, what might the possible culprits be? Hmmm….
Chromium picolinate, which is marketed for blood sugar control and weight loss, also impairs the absorption of thyroid medications. If clients decide to take chromium picolinate, they should take it three to four hours apart from thyroid medications.23 Flavonoids in fruits, vegetables, and tea have been shown to have potential cardiovascular benefits. However, high-dose flavonoid supplements may suppress thyroid function.24 The Natural Standards Database provides an extensive list of supplements that have a potential impact on thyroid function, so taking precautions and coordinating patient care with a knowledgeable practitioner is prudent.
Thyroid hormones regulate cholesterol synthesis, cholesterol receptors, and the rate of cholesterol degradation. Hypothyroidism increases LDL levels, and increased cholesterol levels have been shown to induce hypothyroidism in animal models. Normalization of thyroid hormone levels has a beneficial effect on cholesterol, which may be worth noting especially for clients who choose not to take prescribed thyroid medications.7
Over my several decades working as a Functional Medicine doctor, I can assure you that even in the toughest cases, you can heal your thyroid. With some patients, I can do this through the dietary, nutrient, and lifestyle factors I’ve discussed here. For others, that healing requires trial and error using several medications and working closely with a physician.
l-Thyroxine monotherapy for athyreotic rats results in a high T4:T3 ratio at doses sufficient to normalize serum TSH levels (8). Yet, the brain, liver, and skeletal muscle tissues of these l-thyroxine–treated animals continue to exhibit markers of hypothyroidism (9), probably because of the inability of l-thyroxine monotherapy to restore tissue levels of T3 (8). This is probably a direct consequence of lower serum T3 levels and the relatively high T4 concentration in these tissues, which inactivates the type 2 iodothyronine deiodinase (D2). In the hypothalamus, loss of D2 is minimal in the presence of T4, which increases sensitivity to T4 levels and explains TSH normalization, despite relatively lower levels of serum T3. Only combination therapy with l-thyroxine plus l-triiodothyronine normalized all thyroid hormone–dependent measures (9), including serum and tissue T3 levels (8). Whether tissue-specific markers of hypothyroidism are restored with l-thyroxine monotherapy in humans remains to be determined, as does the ability of l-thyroxine plus l-triiodothyronine combination therapy to normalize the serum T4:T3 ratio without adverse events. The development of a novel drug delivery system for l-triiodothyronine would facilitate these studies (5).
Since iodine is found in soils and seawater, fish are another good source of this nutrient. In fact, researchers have long known that people who live in remote, mountainous regions with no access to the sea are at risk for goiters. "The most convincing evidence we have [for thyroid problems] is the absence of adequate nutrition," says Salvatore Caruana, MD, the director of the division of head and neck surgery in the department of otolaryngology-head and neck surgery at ColumbiaDoctors.
Gluten is the common protein found in wheat, barley, & rye. Gluten is a sticky, storage protein that is challenging for the digestive tract because it binds to the small intestinal wall where it can cause digestive and immune system disorders. Gluten sensitivity is an epidemic that is a major contributing factor with inflammatory and autoimmune diseases (61, 62).
Lack of ideal thyroid hormone function leads to a global decline in cellular functionality in all bodily systems. The thyroid is a central player in the complex web of human metabolism and is very sensitive to even minor imbalances in other areas of physiology. The thyroid gland is the most common site for the development of an autoimmune disease.
If you have been diagnosed with both hypothyroidism and iodine deficiency, there are some things you can do to make these vegetables less harmful. Cooking them can reduce the effect that cruciferous vegetables have on the thyroid gland, and limiting your intake of these (cooked) vegetables to 5 ounces a day may help as well, since that amount appears to have no adverse effect on thyroid function.
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