When it comes to thyroid medications, it’s important for RDs to know the medications can interact with common nutritional supplements. Calcium supplements have the potential to interfere with proper absorption of thyroid medications, so patients must consider the timing when taking both. Studies recommend spacing calcium supplements and thyroid medications by at least four hours.21 Coffee and fiber supplements lower the absorption of thyroid medication, so patients should take them one hour apart.22 Dietitians should confirm whether clients have received and are adhering to these guidelines for optimal health.
AGEs cause massive destruction throughout the body and have an affinity for thyroid tissue. Elevated HgA1C (a measure of glycation) is correlated with increased TSH and decreased free T3 & T4 (57). When the blood sugar drops too low (hypoglycemia), it increases stress hormone (cortisol and adrenaline) to boost up blood sugar. Cortisol directly inhibits the enzyme (5’-deiodinase) which converts inactive T4 into active T3.
As mentioned above, most thyroid conditions are auto-immune diseases. There are tons of lymphocytes and other immune cells in the gut, which protect the body from viruses, bacteria, and other invaders. This is why most people with thyroid conditions also experience frequent bloating, gas, constipation or diarrhea. A diet change will help your gut tremendously. “All disease begins in the gut“, said Hippocrates, the father of modern medicine. I’m not sure why this is not taught in schools today, but it’s an important part of the thyroid diet plan.
You probably get enough zinc already (most people in the U.S. do), but if you have a poor diet or a GI disorder that interferes with your ability to absorb zinc, you might be at risk for a deficiency, says Ilic. Meats are a good source: One 3-ounce serving of beef chuck roast contains 7 milligrams; a 3-ounce beef patty contains 3 milligrams; and a 3-ounce serving of dark chicken meat contains 2.4 milligrams.
Radioimmunoassays for measurement of serum T3 (48) and T4 (49) were soon developed, and it was observed that l-thyroxine monotherapy could normalize both T4 and T3 levels at the expense of a high T4:T3 ratio. In contrast, l-triiodothyronine, desiccated thyroid, thyroglobulin, and l-thyroxine/l-triiodothyronine combination all typically resulted in low or low-normal serum T4 values with usually elevated serum T3 levels, and thus a low T4:T3 ratio (28). Desiccated thyroid resulted in a T3 peak about 2 to 5 hours after administration that corresponded to thyrotoxic symptoms in some patients (50). That a single daily dose of l-thyroxine resulted in stable blood levels of T4 and T3 throughout the day (48) was understood to result from a steady rate of conversion of T4 to T3 (51).
To find out if you have hypothyroidism, your doctor will run blood tests to check for levels of the hormones known as T4 (thyroxine) and TSH (thyroid-stimulating hormone). Hypothyroidism is diagnosed in your thyroid test when TSH is high. Sometimes, TSH can be high, but the thyroid is still producing enough hormones. This condition is referred to as subclinical (or mild) hypothyroidism.
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).
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).
Constipation is a common symptom of hypothyroidism. Whole-grain foods such as cereal, bread, pasta, and rice are high in nutrients in addition to fiber, which can help with bowel regularity. However, fiber can interfere with synthetic thyroid hormones, cautions Turner. Some people with hypothyroidism choose to avoid whole-grains altogether, but if you do choose to eat them, "the recommendation is to take your thyroid medication several hours before or after eating foods rich in dietary fiber," she says.
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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