The thyroid gland uses iodine (mostly from foods in the diet like seafood, bread, and salt) to produce thyroid hormones. The two most important thyroid hormones are thyroxine (tetraiodothyronine or T4) and tri-iodothyronine (T3), which account for 99% and 1% of thyroid hormones present in the blood respectively. However, the hormone with the most biological activity is T3. Once released from the thyroid gland into the blood, a large amount of T4 is converted as needed into T3 - the active hormone that affects the metabolism of cells.
Making dietary changes is your first line of defense in treating hypothyroidism. Many people with hypothyroidism experience crippling fatigue and brain fog, which prompts reaching for non-nutritional forms of energy like sugar and caffeine. I’ve dubbed these rascals the terrible twosome, as they can burn out your thyroid (and destabilize blood sugar).
There is little mention of patients who did not respond symptomatically to treatment despite having normalization of their other measured variables, such as BMR or serum PBI, in the early clinical trials in the 1940s through 1960s. After the 1970s (38, 52), a new category of hypothyroid patient was recognized: the patient who received thyroid hormone replacement therapy, had normal serum TSH, and exhibited residual symptoms of hypothyroidism. Initially, such symptoms were largely dismissed as unrelated to the thyroid condition (62). Indeed, hypothyroidism is prevalent, and symptoms overlap with those of other common conditions, including menopause, depression, and chronic fatigue syndrome. Likewise, thyroid hormone had been administered for nonthyroid disorders, including obesity and psychiatric disease, for decades. Thus, it was difficult to assess whether patients with residual symptoms had been misdiagnosed. Residual symptoms were even attributed to nonadherence (63).
The first step in treatment of hypothyroidism is to eliminate the effects and causes of the thyroid dysfunction, such as inflammation, overuse of medications, nutrient deficiencies, and changes in hormones due to stress. The hypothyroidism diet eliminates foods that can cause inflammation and immune reactions and instead focuses on foods that help heal the GI tract, balance hormones, and reduce inflammation.
Medications that are used to treat an overactive thyroid (hyperthyroidism) may cause hypothyroidism. These drugs include methimazole (Tapazole) and propylthiouracil (PTU). The psychiatric medication, lithium (Eskalith, Lithobid), is also known to alter thyroid function and cause hypothyroidism. Interestingly, drugs containing a large amount of iodine such as amiodarone (Cordarone), potassium iodide (SSKI, Pima), and Lugol's solution can cause changes in thyroid function, which may result in low blood levels of thyroid hormone.
One root vegetable that is the exception, and which can negatively impact an underactive thyroid is cassava, a common staple in certain parts of Africa. This plant “is known to produce toxins that can slow an already underactive thyroid,” Dr. Nasr says. But, “that’s not relevant here in the United States, unless you cook cassava and you eat it every day.”
Certainly, many of the foods listed above are an important part of a healthy diet. Try to eat a varied diet so that you avoid eating large amounts of goitrogenic foods on any one day. Be especially careful about raw juicing, which can concentrate these foods. Cooking, steaming, and even blanching (such as with kale) reduce goitrogen content and are good options when you wish to consume these foods.
In developing countries, insufficient amounts of iodine in the diet account for most cases of hypothyroidism. Iodine is necessary for the production of the two main thyroid hormones, thyroxine (T-4) and triiodothyronine (T-3). In the U.S. – where salt is iodized, and most Americans get plenty of iodine from table salt – an autoimmune condition known as Hashimoto’s thyroiditis is the most common cause. Hashimoto’s is more common in women and in those with a family history of autoimmune diseases. It involves immune-related inflammation and destruction of the thyroid gland, which reduces proper functioning and production of thyroid hormone. The exact cause and triggers of Hashimoto’s still remains unknown.
There are some people who say that there is no scientific evidence linking food to thyroid problems or healing. We have a choice to make about how we want to view things and about what we want to believe. Choice is a powerful tool. Let us never forget that. Even if there is supposedly “no evidence” that food is linked to thyroid healing, you could say to yourself, “What if I try something new and different for 3 weeks and just see how I feel.” Because really, what have you got to lose? Especially if you have been sick for a long time… You might learn something new and have fun along the way! You have a choice. You can choose to start a thyroid diet plan and see what happens.
For starters, consider the effect that hypothyroidism can have on weight. Hypothyroidism (also called low thyroid or underactive thyroid) is marked by insufficient hormone production in the thyroid — the butterfly-shaped gland located at the bottom-front of your neck. This gland affects the body’s metabolic processes, and often, sudden weight gain is an early sign of low thyroid.
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Please Note: The material on this site is provided for informational purposes only and is not medical advice. Always consult your physician before beginning any diet or exercise program.
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