Iodine is an essential ingredient in thyroid hormone, and thyroid hormone is critical to the growth and development of the bodies and brains of all baby vertebrates (animals with backbones). Since they need iodine just as much as we do, and they do not have access to artificially iodized salt, how do they get their iodine? Do they have a secret stash somewhere that they’re not sharing with us? I assume they are getting enough iodine because if they weren’t, they would all be born brain-damaged runts, and many would be infertile if they survived to adulthood. To the best of my knowledge, wild inland animals are not herds of sterile, stupefied miniatures roaming the landscape in search of iodine…
Soy for thyroid health is controversial: There's some research that suggests soy might negatively affect your thyroid gland under certain circumstances, like if you have an iodine deficiency. (Something to keep in mind: A 2011 study of vegetarians and vegans in the Boston area found that some vegans did have a mild iodine deficiency, most likely because they don't eat animal and dairy products). But other research presented at the 2014 Endocrine Society's annual meeting found that unless you have thyroid problems already, soy probably won't have any effect on it. Again, says Ilic, as long as you're eating normal amounts of soy, there's no reason to worry it'll hurt your thyroid.
A clinical trial investigating symptoms found that patients receiving l-thyroxine monotherapy, even with a normal TSH, displayed substantial impairment in psychological well-being compared with controls of similar age and sex (3). Because some hypothesized that this phenomenon came about only after adoption of l-thyroxine monotherapy, a study assessed combination therapy with l-thyroxine and l-triiodothyronine. Remarkably, the latter study showed that psychological measures improve in patients receiving combination therapy until serum TSH level is normal (6). In another study comparing l-thyroxine monotherapy versus desiccated thyroid, in which both groups had a normal TSH, many patients preferred desiccated thyroid and lost weight (60). Unfortunately, the solution to this complex problem is not as simple as reverting to combination therapy; the more than a dozen clinical trials on the subject have not shown benefit of superiority and preference for combination therapy, as previously reviewed (1, 3, 70).
Supplements may also mess with your treatment and can be harmful. Iodine supplements, for example, can cause your thyroid to make too much or too little hormone. Too much of a healthy vitamin isn't good for you. Fiber supplements can absorb medication and keep the full dose from working in your body. Herbs may interfere with your medication and may not be safe or effective.
Many types of seaweed are chockfull of iodine, but the amount can vary wildly, says Mira Ilic, RD, a registered dietician at the Cleveland Clinic. According to the National Institutes of Health, a 1-gram portion can contain anywhere from 11% to a whopping 1,989% of your percent daily value. But since seaweed is especially high in iodine, you shouldn't start eating sushi every day of the week. Too much iodine can be just as harmful to your thyroid as too little by triggering (or worsening) hypothyroidism. To get seaweed's big benefits without going overboard, Cynthia Sass, MPH, RD, and Health's contributing nutrition editor advises sticking to one fresh seaweed salad per week (in addition to sushi), and steering clear of seaweed teas and supplements.
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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