Initial strategies for thyroid hormone replacement included thyroid transplantation, but efficacious pharmacologic strategies soon won favor. Natural thyroid preparations containing T4 and T3, such as desiccated thyroid, thyroid extracts, or thyroglobulin, were the initial pharmacologic agents. Synthetic agents were synthesized later. Early clinical trials demonstrated the efficacy of synthetic and natural agents, but concerns arose regarding consistency of natural thyroid preparations and adverse effects associated with T3-containing preparations (natural or synthetic). With the demonstration of peripheral T4-to-T3 conversion and the availability of the serum TSH radioimmunoassay in the early 1970s, there was a major trend in prescribing preference toward l-thyroxine monotherapy. BMR = basal metabolic rate; DT = desiccated thyroid; IV = intravenous; RIA = radioim-munoassay; T3 = triiodothyronine; T4 = thyroxine; TG = thyroglobulin; TSH = thyroid-stimulating hormone.
• Selenium: The highest concentration of selenium is found in the thyroid gland, and it’s been shown to be a necessary component of enzymes integral to thyroid function.14 Selenium is an essential trace mineral and has been shown to have a profound effect on the immune system, cognitive function, fertility in both men and women, and mortality rate.
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.
Zinc is another key nutrient for your thyroid—your body needs it to churn out TH. Take in too little zinc, and it can lead to hypothyroidism. But get this: If you develop hypothyroidism, you can also become deficient in zinc, since your thyroid hormones help absorb the mineral, explains Ilic. And when that happens, you may also experience side effects like severe alopecia, an autoimmune condition that attacks hair follicles and makes it fall out in clumps, according to one 2013 report.
Although the implementation of sensitive TSH assays resulted in dose reduction, it also fueled the discovery of subclinical states of hypothyroidism (i.e., serum TSH <10 mIU/L and normal serum free T4); this state is 20 times more prevalent than overt hypothyroidism (64). Hence, many patients with vague symptoms, such as depressed mood and fatigue, are commonly screened and found to have subclinical hypothyroidism. In many cases, this finding prompts the conclusion that the subclinical hypothyroidism is the cause of the nonspecific symptoms, and thyroid hormone therapy is initiated. The patients in whom the cause–effect relationship was incorrect contribute to the increasing number of euthyroid but symptomatic patients (57). The marked increase in prescribing of thyroid hormone with decreasing TSH thresholds amplifies this problem (47).
90% of all hypothyroid conditions are autoimmune in nature. In other words, most people with hypothyroidism have the condition Hashimoto’s Thyroiditis. But what causes this condition? Numerous factors can trigger an autoimmune response and result in the elevated thyroid peroxidase (TPO) and/or thyroglobulin antibodies you see with Hashimoto’s Thyroiditis. These antibodies will damage the thyroid gland, which is what leads to the decreased production of thyroid hormone. And while taking synthetic or natural thyroid hormone might be necessary for someone who has low or depressed thyroid hormone levels, this won’t do anything to improve the health of the immune system. So the goal is to detect and then remove the trigger which is causing the autoimmune response, get rid of the inflammation, and suppress the autoimmune component of the condition.
You may have read that green, leafy veggies like kale, bok choy, broccoli, and Brussels sprouts can make hypothyroidism worse. But before you keep reading, ask yourself a question: Do you live in the United States? That’s key — because if you do, you likely don’t need to worry about these cancer-fighting veggies messing with your hypothyroidism management. (7)
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