Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
Diagnosis of hypothyroidism is based on your symptoms and the results of blood tests that measure the level of TSH and sometimes the level of the thyroid hormone thyroxine. A low level of thyroxine and high level of TSH indicate an underactive thyroid. That's because your pituitary produces more TSH in an effort to stimulate your thyroid gland into producing more thyroid hormone.
When a patient is suspected to have a thyroid disorder a comprehensive thyroid profile is ordered, in the form of a blood test. The test results will give precise measurements of Free T3 and T4 and their ratios to each other. If the results indicate that for example, the patient’s T3 level is too low then the patient will be checked for deficiencies in essential nutrients which are required for hormone production. Many times this will correct the thyroid without the need for prescription hormones.
*In the years prior to the discovery of peripheral T4-to-T3 conversion, most groups recommended treatment with natural thyroid preparations, such as desiccated thyroid, thyroid extract, or thyroglobulin, which contain both T4 and T3. However with the discovery of T4-to-T3 conversion and the development of the radioimmunoassay for TSH in the early 1 970s, not only was there a trend toward l-thyroxine monotherapy, but the recommended daily maintenance doses decreased significantly. These trends led to the adoption of the contemporary standard of care: l-thyroxine monotherapy administered at doses to maintain a normal serum TSH level.
A diet low in nutrient-rich foods, especially in iodine and selenium (which are trace minerals crucial for thyroid function), increases the risk for thyroid disorders. The thyroid gland needs both selenium and iodine to produce adequate levels of thyroid hormones. And these nutrients also have other protective roles in the body; for example, severe selenium deficiency increases the incidence of thyroiditis because it stops activity of a very powerful antioxidant known as glutathione which normally controls inflammation and fights oxidative stress.
Information on this website is provided for informational purposes only and is not intended as a substitute for the advice provided by your physician or other healthcare professional. You should not use the information on this website for diagnosing or treating a health problem or disease, or prescribing any medication or other treatment. Any third party offering or advertising on this website does not constitute an endorsement by Andrew Weil, M.D. or Healthy Lifestyle Brands.
Megan Casper, RDN, a dietitian based in New York City and the founder of Nourished Bite, points out that iodine deficiency is the leading cause of hypothyroidism worldwide. This mineral can’t be made by the body, so dietary sources like iodized salt, dairy products, seafood, seaweed, and fortified cereals are important. “Iodine is an essential nutrient in the body, and thyroid hormones are composed of iodine,” explains Rizzo. “Those lacking thyroid hormones may also be lacking iodine.”
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