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.
l-Thyroxine was the first synthetic molecule used to treat hypothyroidism (23) and was shown to be efficacious as monotherapy for myxedema (24). Around that time, serum protein-bound iodine (PBI) emerged as a diagnostic test and therapeutic marker; serum PBI quantitation was the only valid way to biochemically assess thyroid hormone status (25). This tool was limited in terms of treatment monitoring because the effect on serum PBI varied by agent (26). For example, l-triiodothyronine corrected BMR without much increase in serum PBI, l-thyroxine increased serum PBI sometimes to above normal, and combination l-thyroxine and l-triiodothyronine and desiccated thyroid had the advantage of normalizing serum PBI (27). In addition to BMR and serum PBI, other surrogates for treatment response included cholesterol levels, symptoms, and deep tendon reflexes, but their lack of sensitivity was always recognized (28).
Although it’s not very common, newborns are sometimes born with a dysfunction of the thyroid gland, a genetic condition called congenital hypothyroidism. Some evidence shows that people are more likely to develop hypothyroidism if they have a close family member with an autoimmune disease. But according to the National Institute of Health (NIH), the likelihood of congenital hypothyroidism is very low and only about 1 out of every 4,000 newborns is born with a thyroid disorder. (8b)
A cup of cooked white beans serves up 8mg of iron—a mineral that many people, especially premenopausal women, have trouble getting enough of . But getting your fill is important. “If you don’t, it can impair the activity of enzymes that produce thyroid hormones,” Dr. Lee says. (Women aged 19 to 50 need 18mg iron daily, while men and women 51 and older need 8mg .)
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.
According to Dr. Datis Kharrazian, 90% of people with hypothyroidism have Hashimoto’s, an autoimmune hypothyroid condition, whereby the immune system attacks thyroid tissue. Therefore, to cure thyroid disease, or any autoimmune condition, you have to get to the source of the imbalance; focusing on suppression of symptoms with medication is simply barking up the wrong tree.
Kale reigns supreme in the land of leafy green vegetables that we often eat raw, but beware if you have an iodine deficiency. “Kale gets a big baddy,” Blum says. “Eat it cooked.” When raw, this dark green leaf steals the iodine from the thyroid gland. If you must, it’s ok to nosh on the green veggie in your salad, but stop at two servings a day. No need to get extra credit on the superfood.
Clara Schneider, MS, RD, RN, CDE, LDN, of Outer Banks Nutrition and author of numerous books, including The Everything Thyroid Diet Book, says, “The No. 1 priority is to get the thyroid disease under control. Clients need to have labs and medications addressed first. Weight changes are just not going to happen before all of that is under control.” She notes that Hashimoto’s typically occurs around menopause, which compounds the weight gain issue that many women experience during that time.
Cruciferous vegetables, such as broccoli and cabbage, are full of fiber and other nutrients, but they may interfere with the production of thyroid hormone if you have an iodine deficiency. So if you do, it’s a good idea to limit your intake of Brussels sprouts, cabbage, cauliflower, kale, turnips, and bok choy, because research suggests digesting these vegetables may block the thyroid's ability to utilize iodine, which is essential for normal thyroid function.
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