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).
Hypothyroidism Medication: Conventional doctors almost always put their patients on either Synthroid® (a synthetic thyroid hormone pill that contains only T4; sometimes called Levothyroxine, Levothroid, Unithroid, and Tirosint) or Armour (Natural Desiccated Thyroid derived from the thyroid glands of pigs). Both are tablets that patients will have to take daily for the rest of their lives. In some cases, these medications might help, but there are all kinds of side effects and issues that arise. So I recommend two other medications over these two instead.
You need to reduce the toxins you ingest from additives, preservatives, artificial sweeteners (!), excessive sodium, and trans-fats and try to eliminate toxins hiding around your house. Water toxicity is a HUGE problem in thyroid conditions. Most public water systems in the US have fluoride added, which is now linked to slowing down the thyroid; fluoride is believed to be leaching on to the thyroid cells inhibiting the uptake of iodine, hence the altered production of the thyroid hormone (T4).
Short of eating a few kelp salads, you probably don't have to worry about getting too much iodine from any other foods. In particular, dairy products are full of this nutrient (and in more manageable amounts), according to a 2012 research in the journal Nutrition Reviews. Part of the reason is because livestock are given iodine supplements and the milking process involves iodine-based cleaners. Plain, low-fat yogurt, or Greek yogurt is a good source—it can make up about 50% of your daily intake of iodine.
Gluten – Many people with thyroid issues are also sensitive to gluten or have celiac disease, an autoimmune disease that results in an allergy to gluten. Gluten is found in all wheat, rye and barley products, so carefully check ingredient labels to avoid hidden gluten that is lurking in many packaged foods. Undiagnosed sensitivities to gluten can further raise inflammation, create nutrient deficiencies and worsen hormonal problems.
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.
Since most cases of hypothyroidism are permanent and often progressive, it is usually necessary to treat this condition throughout one’s lifetime. Periodic monitoring of TSH levels and clinical status are necessary to ensure that the proper dose is being given, since medication doses may have to be adjusted from time to time. Optimal adjustment of thyroid hormone dosage is critical, since the body is very sensitive to even small changes in thyroid hormone levels.

These clinical trials also began to define the adverse-effect profiles associated with these agents; thyrotoxicosis was frequently encountered. Patients treated with l-triiodothyronine3 (100 to 175 mcg/d) normalized BMR faster than did those receiving desiccated thyroid (120 to 210 mg/d) or l-thyroxine (200 to 350 mcg/d) but were more likely to experience angina (32). Desiccated thyroid was also associated with adverse symptoms in other studies; muscle stiffness, psychosis, and angina all occurred (33). In a crossover study of l-triiodothyronine monotherapy (75 to 100 mcg/d), l-thyroxine monotherapy (200 to 300 mcg/d), and desiccated thyroid (1.5 to 3 grains/d), all of these therapies restored BMR and serum PBI; with l-triiodothyronine, however, angina and heart failure occurred. Dose reduction corrected these adverse effects, but authors concluded that l-thyroxine monotherapy or thyroid extract was preferred (34). In a trial of l-thyroxine monotherapy at doses of 200 to 300 mcg/d versus l-thyroxine (80 mcg) plus l-triiodothyronine (20 mcg) daily, patients receiving the combination had such symptoms as palpitations, nervousness, tremor, and perspiration (35). Some early proponents of l-thyroxine monotherapy emerged because of less frequent thyrotoxic effects (24), but it is difficult to determine whether such adverse effects were related to the agent used or its high dosage. Thyrotoxic adverse effects were typically remediable by simple dose reduction (36), so desiccated thyroid remained the preparation of choice (37).
Avoiding daily installments of ice cream scoops (sigh), fudgy brownies and cookies, and bowls of jelly beans may be a (sad) reality check for your health, in general. But limiting sugar can also help you reduce inflammation—a root cause of chronic illness—in the body, says Dr. Susan Blum, MD, an integrative medicine physician and founder of the Blum Center for Health in Rye Brook, New York. Many studies show an inflammatory microenvironment in your body weakens your immune response toward the spread of thyroid cancer spread in advanced stages, according to the Endocrine-Related Cancer journal.

T4 circulates through to the liver where 60% of it is converted into T3 through the glucoronination and sulfation pathways.  If the liver is sluggish it will cause a problem in T4-T3 conversion (6).  Another 20% is converted into reverse T3 which is permanentely inactive.  The final 20% is converted into T3 sulfate and T3 acetic acid which can then be further metabolized by healthy gut bacteria to produce more active T3 (6).
A complete thyroid diet solution includes more than just food. I cannot emphasise how important these are for managing stress and emotions, especially for people with hyperthyroidism. We underestimate what stress and emotions do to us; each flare-up of anger, feelings of guilt, fear, hostility, jealousy, etc. fires up the adrenals which release cortisol, and cortisol has a detrimental impact on the thyroid.

Think milk, butter, cheese, and meat. If you buy the cheap, conventionally raised versions at the supermarket, those types of deliciousness can also disrupt all your thyroid’s hard work. You omnivores (like us) can avoid this dilemma by choosing organic, or at least antibiotic-free and hormone-free meats and dairy. It’ll save you in the end, with fewer medical costs down the line.
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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