When the hypothalmus decides we need more thyroid hormone in circulation (cold weather or increased activity level for example) it sends a chemical messenger called thyrotropin-releasing hormone (TRH) which goes to the pituitary gland. The pituitary than sends thyroid stimulating hormone (TSH) over to the thyroid. TSH activates the production of a protein called thyroglobulin.
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.
With the availability of multiple forms of thyroid hormone replacement, early clinical trials were designed to assess efficacy and dose equivalency among natural thyroid (typically desiccated), synthetic l-thyroxine, and/or l-triiodothyronine. These were not designed as superiority trials, their therapeutic goals were the normalization of serum PBI or BMR, and doses were dramatically higher than used today. For example, desiccated thyroid and intravenous l-thyroxine monotherapy normalized BMR, pulse, and body weight in myxedema (29), l-triiodothyronine monotherapy was likewise effective (30), and the potency of l-triiodothyronine exceeded that of l-thyroxine (31).
Dietary changes: For those who have existing thyroid conditions, excess consumption of soy may affect thyroid function, but this is probably a concern only in those already taking Synthroid or other thyroid replacement medication. If you consume soy on a regular basis, you may require a slightly increased dosage of replacement therapy. You should also know that if you eat soy foods at the same time that you take thyroid hormone, they may interfere with its absorption. To be safe, do not eat soy within three hours of taking your medication. Moderate soy consumption (one serving daily of whole soy foods) should not be a problem. Adequate iodine from dietary sources is also important – iodized salt, fresh ocean fish and seaweed are good sources.
Postpartum thyroiditis: Five percent to 10 percent of women develop mild to moderate hyperthyroidism within several months of giving birth. Hyperthyroidism in this condition usually lasts for approximately one to two months. It is often followed by several months of hypothyroidism, but most women will eventually recover normal thyroid function. In some cases, however, the thyroid gland does not heal, so the hypothyroidism becomes permanent and requires lifelong thyroid hormone replacement. This condition may occur again with subsequent pregnancies.
l-Thyroxine monotherapy, the novel and physiologically savvy method for treatment of hypothyroidism, contrasted with the traditional approach of natural thyroid preparations that was marred by potency concerns. In less than a decade, there was a major shift in treatment of hypothyroidism such that normalization of TSH with l-thyroxine monotherapy became the new standard of care (Appendix Table) (52). Many clinicians advocated for this to be first-line therapy and for patients previously treated with desiccated thyroid to be transitioned to l-thyroxine monotherapy (50).
Because it helps balance hormone levels, selenium can lower the risk for experiencing thyroid disorder during pregnancy (postpartum thyroiditis) and afterwards. Other studies have shown that when selenium deficiency is resolved through supplementation, patients experience on average 40 percent reduction in thyroid antibodies compared to a 10 percent increase in the placebo group. Selenomethionine is the preferred form of selenium supplementation as it is the form found naturally in food and about 90% of it is absorbed.
Hypothyroidism symptoms include: family history of thyroid disorders, hormonal imbalances, irregular periods, infertility, constipation and other digestion issues, weight gain, bloating, puffy face, irregular hair loss and/or thinning of your hair and/or your hair has become coarse, dry, breaking, brittle, and/or is falling out, acne and/or dry or thinning skin, mood disorders, like anxiety or depression, fatigue, low energy and/or low libido, increased sensitivity to cold, low body temperature usually below 98.6 degrees and/or cold hands and feet, muscle weakness, aches, tenderness and stiffness and/or pain, stiffness or swelling in your joints, trouble falling asleep or staying asleep, numbness or tingling in your hands & fingers, difficulty concentrating, focusing or remembering things and brain fog.
The most common cause of hypothyroidism in the United States is an inherited condition called Hashimoto's thyroiditis. This condition is named after Dr. Hakaru Hashimoto who first described it in 1912. In this condition, the thyroid gland is usually enlarged (goiter) and has a decreased ability to make thyroid hormones. Hashimoto's is an autoimmune disease in which the body's immune system inappropriately attacks the thyroid tissue. In part, this condition is believed to have a genetic basis. This means that the tendency toward developing Hashimoto's thyroiditis can run in families. Hashimoto's is 5 to 10 times more common in women than in men.
Brazil nuts are packed with another nutrient that helps regulate thyroid hormones: selenium. In one 2003 study by researchers in France, women who consumed higher amounts of selenium were less likely to develop goiters and thyroid tissue damage than those who didn't. Plus, it may also help stave off long-term thyroid damage in people with thyroid-related problems like Hashimoto's and Graves' disease, according to a 2013 review in the journal Clinical Endocrinology.
An unhealthy gut environment can contribute to nutrient deficiencies and raise autoimmune activity in the body. Food sensitivities or allergies, including those to gluten and dairy, can trigger gut inflammation. Other causes of a damaged gut are high stress levels, toxin overload from diet and the environment and bacterial imbalances. When leaky gut occurs, small particles that are normally trapped inside the gut start to leak out into the bloodstream through tiny openings in the gut lining, which creates an autoimmune cascade and a series of negative symptoms.
**Note: It’s important to realize that thyroid medication is not one size fits all, and there is no ONE right solution for everybody. Dosage is incredibly important, your specific thyroid labs will impact what type of medication is needed and we all have different needs, budgets, goals, and symptoms. So work with a functional medicine practitioner to find the thyroid medication that makes the most sense for YOU!
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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