Too Much Iodine Can Be as Bad as Too Little

Too Much Iodine Can Be as Bad as Too Little
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Excessive intake of kelp (kombu) or thyroid-containing sausages can lead to iodine toxicity.

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Below is an approximation of this video’s audio content. To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video.

In this study of Boston vegans, concerns were raised about their iodine status, but one vegan’s iodine level was so high, they were excluded from the study. How is that possible? They were consuming kelp. As I’ve written in my iodine recommendations for a decade now, unless your neighborhood nuclear plant just melted down, no kelp—it just has too much iodine. And if you find yourself in Namibia, you might want to stay away from paddle weed as well. Other than that, though, and staying away from hijiki, which just has too much arsenic, sea vegetables are an excellent source of iodine.

There have been a few recent case reports of iodine toxicity in breastfeeding women eating soup made from kelp, also known as kombu, which explains this: “Iodine toxicity from soy milk.” Why? because it was made with kombu. But if you just read kombu on a label, would you think anything of it? Well, we should. There was a worldwide recall, complete with headlines like: “Café raid seizes banned soy milk.” A black market trade was operating in the banned soy milk, even though they faced half million dollar fines. That particular brand has since been reformulated without kombu.

The other way you can get in trouble with your thyroid gland is if you eat too many of them: “Hyperthyroidism caused by excessive consumption of sausages. After tests of the sausage revealed levels one might find in a dose of a thyroid hormone drug, like Synthroid, they “concluded that this patient had an exogenous hyperthyroidism caused by excessive intake of thyroid-containing sausages.”

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Image Credit: Joi Ito via flickr. Image has been modified.

Below is an approximation of this video’s audio content. To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video.

In this study of Boston vegans, concerns were raised about their iodine status, but one vegan’s iodine level was so high, they were excluded from the study. How is that possible? They were consuming kelp. As I’ve written in my iodine recommendations for a decade now, unless your neighborhood nuclear plant just melted down, no kelp—it just has too much iodine. And if you find yourself in Namibia, you might want to stay away from paddle weed as well. Other than that, though, and staying away from hijiki, which just has too much arsenic, sea vegetables are an excellent source of iodine.

There have been a few recent case reports of iodine toxicity in breastfeeding women eating soup made from kelp, also known as kombu, which explains this: “Iodine toxicity from soy milk.” Why? because it was made with kombu. But if you just read kombu on a label, would you think anything of it? Well, we should. There was a worldwide recall, complete with headlines like: “Café raid seizes banned soy milk.” A black market trade was operating in the banned soy milk, even though they faced half million dollar fines. That particular brand has since been reformulated without kombu.

The other way you can get in trouble with your thyroid gland is if you eat too many of them: “Hyperthyroidism caused by excessive consumption of sausages. After tests of the sausage revealed levels one might find in a dose of a thyroid hormone drug, like Synthroid, they “concluded that this patient had an exogenous hyperthyroidism caused by excessive intake of thyroid-containing sausages.”

Please consider volunteering to help out on the site.

Image Credit: Joi Ito via flickr. Image has been modified.

Doctor's Note

For more videos on iodine, see:
Pregnant Vegans at Risk for Iodine Deficiency                                                                                     Can Gargling Prevent The Common Cold?
Which Seaweed is Most Protective Against Breast Cancer?

Also check out my associated blog posts: How much pus is there in milk?The Best DetoxOptimum Nutrition RecommendationsDo Eden Beans Have Too Much Iodine?; and The Best Way to Prevent the Common Cold?

If you haven’t yet, you can subscribe to my videos for free by clicking here.

82 responses to “Too Much Iodine Can Be as Bad as Too Little

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    1. I get that Kelp affects the thyroid-but what is hypothyroid? Do you think it is effective to treat it with a measured amount of kelp instead of drugs? (If you get the blood tested to see the effects?).
      And just how much kelp will “hurt” you? If you “od” on it one day (darn I am drinking smoothie with kelp in it now!) then it will leave your system eventually, right?




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      1. After seeing these videos I stopped using kelp but I apparently did not eat enough other seaweed because my TSH and LDL levels were high on my last blood test. After doing some research I found Lynn Farrow’s book about iodine. Again the medical “wisdom” of the day is wrong. Iodine is needed in greater quantities because of the toxic halogens the environment. Traditionally Japanese people ate much more than the recommended amount of iodine in foods and perhaps that is why their breast cancer rates were so much lower. There is a protocol to supplementing iodine because of halogen detox side effects. Iodineresearch.com has some information.




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        1. I agree! Very recommended reading, Lynn Farrow’s book. I would recommend Dr. Brownstein’s video on iodine as well.

          My own case: Normal TSH, T3 and T4, no thyroid antibodies but urine test showed no detectable levels of iodine. Taking 3000 mcg of iodine daily (ProThera Iodine Complex) I feel a significant improvement in mood, energy and sleep, not feeling cold as easily.

          I like Dr. Greger’s work a lot but I am afraid he could be suffering from the contagious disease called iodophobia.




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    2. Hi Dr. Greger, thank you for everything you do an amazing work. I have been wondering, my mother switched to a plant based diet after a breast cancer diagnosis. Few years ago she had her thyroid gland irradiated. She now takes syntroid. Is there an issue about taking iodine supplement with this condition? Thank you very much for you answer .
      Ps: I appreciated a lot your videos on cancer topics, thank you.. ( i have posted this comment already on another topics discussion accidentally)




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  1. OK, so this is the one that mentions kombu. Clearly kombu can be of concern and I’m glad you have posted this video now. I’m low on my kombu and may not be replenishing it.

    I still don’t think my question is answered, however. The video clearly says to stay away from eating kombu a lot. I’m trying to figure out if this would be too much or not: A sheet of 2×4 inches of kombu in a pot of grains. And then that pot of grains or beans gets eaten over the course of a *week*. Is that too much iodine? Not safe?

    Also, does all kombu have too much iodine or are there certain brands which are safer?

    Here’s why it matters to me: Your videos make it clear that it is vital to get enough iodine. I don’t like (and am rarely compliant about) taking pills, so I’d like to get my iodine from my diet. I do like nori, but I’m still not clear on how much nori I have to eat and I’m wondering if I have to eat X sheets of nori every week (day?) or if I can mix it up by putting some kombu in a pot of grains or beans. Would spreading out that little bit of kombu over the course of a week be just right or is that still too much?

    Thanks!




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    1. I’m bothered by the same question. How much is a gram of kelp? I use kombu to cook grains and given it’s divided between a bunch of people and is cooked into the food, I don’t think its an issue.




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      1. Are you at peace these days consuming sea vegetables considering the plastic microbeads littering the ocean, as well as red tides, pollution, and chemicals that can’t even be tested for?




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  2. Dr. Greger –

    I’m a big fan of tuno salad sandwiches (basically mashed garbanzos in place of tuna). I add some kelp granules to give it that “seafood” flavor.

    I use about 1/4 tsp of the granules per sandwich, which according to the label is only about 50%DV of iodine.

    Is this much kelp still too much?




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    1. VeganRyan: Any chance of posting your tuno recipe? Or pointing me to the book that has it? (Sounds good to me!)

      I wonder if ground up nori in place of kelp would give it the same flavor? My city has a vegan restaurant which serves “phish and chips”. Put aside for a second the unhealthy nature of fried food – what they do is pretty cool: the fish part is tofu slabs. The batter part includes ground up (I think) nori. This ground up sea food (of some kind – now that I think about it, I should ask which kind) really gives it a perfect fishy flavor. I liked the taste and the idea lot. Your tuno idea really intrigues me. Thanks if you get a chance to share the recipe!




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  3. Hi from New Zealand – I’ve just signed up. Thank you for all the work you put into providing these excellent little videos! – I look forward to watching more. I read the comments and have similar questions – I clicked ‘Supplementary Information’ hoping it would lead to detailed info as a follow up/background to the video. Is that generally provided? Or links to study the issues further? I am on PLant-based Wholefoods, and get my blodds donw regularly to monitor zinc, Vit D (I’m low), B12, iron,etc (I’m high). My GP,(MD), tested me for iodine and I was low. She recommended supplementing. I prefer to take seaweed instead of the drops. The test is convoluted so it would be difficult to test regularly for ongoing monitoring. How can I find out the optimum amounts and types of sea vegetables to eat?




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  4. Are there Iodine only supplements and are they effective to take? Also, is there any vegan supplement that provides 100% DV of B12, D and Iodine all in one for those of us that eat only whole plant based foods?




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  5. I’m trying desperately to get my mother to change to a vegan diet because of her heart issues, diabetes and cancer! She is doing really well with it so far, but because she had her thyroid removed many years ago, she’s afraid to eat kale, broccoli or anything in the cabbage family. (iodine related problem I guess)

    My question is…is it true that cabbage family foods need to be avoided for people who are on thyroid medication?




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    1. There are natural substances in a wide range of healthy foods (including cabbage family vegetables, soy, flax seeds, and a hundred other plant families) that can interfere with thyroid function in those with inadequate iodine intake. The answer isn’t that we should avoid these super-healthy foods, but instead make sure we get enough iodine (the anti-thyroid effects are reversed in iodine deficient individuals with iodine supplementation). See my videos Avoiding Iodine Deficiency and Pregnant vegans at risk for iodine deficiency.

      Now your mom is a special case. The mechanism by which these substances are thought to work is by inhibiting iodine uptake by the thyroid (so this is why if you’re iodine deficient this can be a problem, but if you have enough iodine your thyroid gets all it needs even if you’re eating lots of these healthy foods–though one can overdo it, see Overdosing on Greens). Your mom doesn’t have a thyroid gland, so there should be no effect of cabbage family vegetables since she’s taking pre-made thyroid hormones in pill form.




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      1. Appreciate the info. regarding iodine with thyroid issues. I have Hashimoto’s and feel as though everywhere I turn (websites, health “professionals”, etc. the paleo diet is hailed as the best diet for Hashimoto’s and other autoimmune diseases. I would love to hear you do a video debunking that. By the way, your new book has changed my omnivore Nurse Practitioner mother to a plant-based eater! After years of me trying all it took was reading your book. Already she is off her antidepressants and feels wonderful. Thank you!




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        1. Hi Alysson, just been diagnosed myself and Im on a plantbased diet that I would rather not quit. I still dont understand the iodine relationship with this and so. Any tips for me? thanks!




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  6. Over the last year I have had a lot of hair falling out, so am taking a supplement for hair growth. I decided to take an iodine supplement based on past experiences of low thyroid and because I eat a lot of greens that are said to interfere with thyroid/iodine function, and also a fair share of sea vegis. Now I am wondering if I am overdoing it. Any ideas? A few years ago I took a 24 hr iodine test and it came out ok. I think I’ll drop the iodine supplements.




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  7. My family and I eat lots of beans. I buy Eden Organic beans and I’ve noticed that they all list kombu as an ingredient. Should I stop using this brand?




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    1. See http://nutritionfacts.org/2012/07/05/do-eden-beans-have-too-much-iodine/
      Dr. Greger posted, “July 18 UPDATE: Eden’s tests are in, and preliminary results suggest the iodine content of their beans ranges from 36.3 mcg per ½ cup serving (Great Northern beans) to 71.2 mcg (Navy beans). That’s quite the Goldilocks sweet spot–a single can could fulfill one’s daily iodine requirement nicely, and it would take around 20 servings a day to hit the upper limit (and even I don’t like beans that much! :)”




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  8. I found the URL to the site of the report featured in your video: 

    https://www.mja.com.au/journal/2010/193/7/iodine-toxicity-soy-milk-and-seaweed-ingestion-associated-serious-thyroidBut it only shows a few people who were affected by consuming soymilk with kombu.  It is unclear whether combining soy with kombu was the problem.  Some researchers would argue that soy consumption could have contributed to the thyroid problem.  I am wondering how many other people who have been consuming just kombu without exhibiting iodine toxicity as reported in the video.




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      1. kelp noodles is 50mcg per 120g according to one company, very hard information to find.
        I’d like a second source tho. How can it be so low when kelp is normally so high.




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  9. Actually, Doc, my nearest nuclear power plant DID melt down! (I live about 100 miles south of Fukushima Daiichi). Happily, we were spared dangerous levels of contamination.

    But seriously, this kombu business… How long does iodine stay in the body? I do ingest kombu from time to time, but it is in small amounts, such as when I make vegan dashi soup stock by boiling a bit of kombu and several shitake mushrooms. Once a week? perhaps less? I really don’t think iodine is an issue, even if I get more than enough iodine on one given day. How long is it in my body? A few days?

    As for shijiki… really? Eden foods has posted an excellent English language article about this which sites evidence (by scientists in Ibaraki – my fair prefecture – that the alleged arsenic levels may be due to the acidic compounds used to test for it. And In addition, this is not something we in Japan eat very much of, and not even daily. Perhaps a spoonful with a bento lunch once a week? I don’t know of any reports of actual harm being done to Japanese consumers due to eating small amounts of the stuff. Certainly, the meat and dairy consumed in Japan is a far larger concern, don’t you think?

    As you point out, sea vegetables contain many beneficial nutrients. I don’t over do eating them (as Americans seem to do with many foods) and until hard evidence suggests otherwise will not refrain from consuming them.

    Thank you, with respect and great appreciation for all you do to bring us the latest in scientific knowledge about nutrition.




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  10. Please give me Your opinon on liquId iodine concentrate
    vs levothroxine for thyroid treatment . rx 2 or more drops
    in water per day. or .50mg levothroxine. Have been tested
    t3 t4 tsh. Close to a plant based diet. LOTS OF SYMPTOMS!
    NEITHER seem to help much with symptoms! THANKS




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  11. Dr. Greger, I am reading Kathy Hester’s book “The Great Vegan Bean Book” in which she states that beans in the kidney bean family should be boiled for 10 minutes — including cannellini beans — to rid them of “a toxic agent, phytohaemagglutinin, also known as kidney bean lectin” What does this toxin do? And do you agree with her remedy?




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  12. Presently taking 1/8th teaspoon of kelp powder from plants grown in an Iceland bay away from shipping lanes. That amount has a bit more than the US RDA. Taking that with an equal amount of chlorella powder to bind any heavy metals which might still be in the kelp. Does that sound legit?




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    1. February 6th, 2017 at 11:47 am
      See http://nutritionfacts.org/2012/07/05/do-eden-beans-have-too-much-iodine/
      Dr. Greger posted, “July 18 UPDATE: Eden’s tests are in, and preliminary results suggest the iodine content of their beans ranges from 36.3 mcg per ½ cup serving (Great Northern beans) to 71.2 mcg (Navy beans). That’s quite the Goldilocks sweet spot–a single can could fulfill one’s daily iodine requirement nicely, and it would take around 20 servings a day to hit the upper limit (and even I don’t like beans that much! :)”




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  13. I’ve heard that soaking kombu in cold water for a few hours, which the prefered way of making dashi, releases virtually no iodine. Is that true? I then thow away the kombu and use this subtle fragrant water to cook beans, soups, gravies and breads. I can’t find any reliable information about this claim and therefore ask for your insight.




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  14. Off topic: I’ve been following several of the recommendations on this site for about 2 weeks now (more changes in the pipeline), and I’ve noticed a completely unexpected benefit – my persistent (but minor) tinea has almost disappeared without any ointment, powder, or even cleaning attention. Wow!




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      1. Sorry, false alarm. It isn’t bad, but it hasn’t gone away completely yet either. I have changed so many things around the same time that it is difficult to know what caused what. But I still think all these dietary changes have been for the better :)




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  15. Arame appears on the chart as a possible good middle level iodine content seaweed. However, it is a type of kelp according to the wikipedia article. Kelp is shown as dangerous. I’ll search for the source of this chart.




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  16. Should these journal articles (cited in this video) be more freely available to the public? I found the article on Nutritional Value of Edible Seaweeds but I need to subscribe at $549 US.




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    1. I am not sure about cranberries and their iodine content. I wrote about sources, here. Yes, I would agree that berries grown away from the coast would have less.




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  17. I must be one typical example of this situation. Since a few years ago I have high TSH (about 6 to 7 mUI/l, normal is below 4), normal T3 and T4, thyroid ultrasonography normal, no symptom at all…. this year I did a ioduria test (on a 24h urine sample) and the result was 1332 mcg/l (normal is below 300). I used to eat a lot seaweeds, especially during my frequent travels to Japan, I do not see any other possible cause (I’m a long term vegan), so now I’m refraining as much as possible from eating seaweeds and taking essential oils to keep TSH to a more normal level. I do not have any anomaly apart from a somewhat high cholesterol (for a vegan: 1.92 g/l TC, I was between 1.20 and 1.40 before), which is also a known effect of hypothyroidism. Hadn’t I did the TSH test, I would never have suspected something was out of order, having no symptom at all.




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  18. Out of curiosity. Wouldn’t eating 1/5 a gram or less of dry kombu be perfectly acceptable if that is basically your only source of iodine? I just don’t see an issue with using very, very small amounts as a supplement that will literally almost last your entire life? Am I missing something?




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  19. Does the common practice of adding a strip of kombu to the pot when cooking up dried beans pose a risk of excessive iodine? (This cooking advice to soften beans and increase digestibility is found on Dr. Weil’s website and many others.)




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  20. Hi,
    I am making my own seaweed capsules 600mg
    Could someone tell me how much iodine is in 500mg of digitata seaweed?
    It seems from my calculations that this would amount to 2500mcg of iodine.
    I have also heard that 37% goes through the body to waste.

    The average amount in digitata is 0.1-0.3 per 100grams
    Can anyone help?
    Kind regards
    Trevor




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    1. I was taking kelp granules and was able to get off, but I was also eating a whole foods planet based diet (I’m a vegan), no GMOs and pretty much all organic, lots of water, regular moderate exercise, enough sleep, and lots of raw fruits and veggies and healthy fats (from foods plus adding 2 tbsp ground flax to diet each day). I’m still taking kelp granules as I heard that we really don’t get enough iodine and that the DV isn’t high enough. I haven’t experienced any problems but was interested in this video, but was disappointed that nothing at all is mentioned WHY excessive iodine is bad….




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  21. After eating kelp for almost 2 years, almost every day, i got slightly hyperactive thyroid. I cannot say for certain that this is from eating kelp, but sure looks like that. We’ll see what tests will show in the future, since i’ve stopped eating the seaweed.




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  22. I had recently been looking for no-salt added beans. I found Eden Organic products. I checked this site to see if the Kombu source of iodine was okay to consume. After watching that featured video, I am satisfied that I am getting the right amount of iodine from it. Then my father found out that Kombu was added to the beans. He said that powdered Kombu is monosodium glutamate (MSG). I have been steering clear of that neurotoxin my entire life. Do I need to be concerned about products containing Kombu?




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  23. I have Hashimoto’s and I just started using seaweed flakes instead of salt to make sure I have iodine in my diet. So far this is the only information I’ve found from you that relates to Hashimoto’s. Is there anything else you’ve researched about treating Hashimoto’s and thyroid disease through lifestyle? A lot of what I see online has to do with consuming bone broth to heal a leaky gut… which sounds like pseudoscience to me.




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  24. So as I understand, the man has a lot of iodine in his urine wich is not actually a toxicity itself, because he take the most of it away from the body.
    Hi level of iodine in blood – that’s would be bad for him, but if he take 1000 mg and he get it away 950 mg – it’s not the same problem?
    With autist kids they get same situation – kids with near 0 amount of mercury in the hair had a plenty of it in the brain. they just was unable to get rid of it, so those who get bigger amount in the hair was in less dangerous position.

    And another good question is what an actual normal level for us?
    because usual way to find a “normal range” – is just measure “healthy population” and make some statistic from it.
    But what if this population leave in iodine deficiency area?
    you obviously get the lower result then it’s really are normal or good for us.




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  25. I want to use some kelp power as a source of iodine, the label from the jar says “iodine 920 (cfu/g)”. Does this label make sense to anyone, or it’s just wrong? What does colony-forming unit (cfu) has to do with the quantity of iodine?




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  26. I use kelp, which you advise against here, for my iodine needs. If I’m only eating 1/8 to 1/4 teaspoon of dried kelp granules each day, am I likely safe from the negative effects of too much iodine. I posted the brand I use below. Thank you for all of your videos. They’ve been so helpful in discerning actual health knowledge in the sea of false information that pervades the internet.

    https://www.luckyvitamin.com/p-395839-maine-coast-sea-vegetables-sea-seasonings-organic-kelp-with-cayenne-1-5-oz?utm_source=google&utm_medium=PLA&sc_intid=125304&scid=scplp3292580&gclid=Cj0KEQiAy53DBRCo4en29Zvcla0BEiQAVIDccxKR2UedKy0Ee3WALfGK_r20FdP-DeZRbhIEEZiiiu0aAtqX8P8HAQ




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  27. I cant seem to find any videos about thyroid disease. I have a goiter and hashimoto’s and have always been told to stay away from cruciferous veggies and soy. I now know many ppl that have hypothyroidism, I hope one day you do some videos on this. Since cruciferous veggies seem to be a staple in your daily dozen. And I can’t seem to find a straight answer about soy.




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  28. Thanks for the great information :) I just bought some wakame and am wondering how many grams I should eat per day to get the recommended intake of iodine.




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    1. Thanks for your comment Christine.

      According to this https://thyroidresearchjournal.biomedcentral.com/articles/10.1186/1756-6614-4-14:

      “Iodine content varies depending on species, harvest location and preparation, and is typically highest in fresh cut blades and lowest in sun bleached blades. The three most popular seaweed products in Japan are nori (Porphyra), wakame (Undaria) and kombu (Laminaria). Dried iodine contents range from 16 μg/g in nori to over 8,000 μg/g in kelp flakes; Japanese kombu and wakame contain an estimated 2353 μg/g and 42 μg/g respectively”

      Because plant-based diets can be low in iodine, vegans who do not consume key vegan sources of iodine, such as iodized salt or sea vegetables, may be at risk for iodine deficiency. Like stated, above the iodine content of sea vegetables varies widely and some may contain substantial amounts of iodine. The Recommend Dietary Allowances are 150mcg for adults, and the intakes should not exceed the Tolerable Upper Intake Level of 1,100 mg (see here).

      According to my calculations (based on this paper), this means, that to meet current recommendations, one could eat 139.7g of wakame.

      Hope this answer helps.




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  29. Dear Dr. Greger, dear nutritionfacts team,

    I love eating nori sheets. However, there is a warning sign on the package which says “Do not consume more than 2.5 g per day”. This would be 1 nori sheet. Sometimes I like to eat 4 or 5 nori sheets. I have a thyroid hypofunction. How much is too much?




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    1. Hi Marley!
      Thanks for your question.
      I love nori and sushi too! So it was great to be able to look up some info about something I eat a lot of.
      From this paper’s calculations of the amount of iodine in nori sheets, I worked out that there is about 150 mcg iodine in 1 nori sheet. The recommended intake for healthy adults is 150 mcg a day, according to the NIH. Therefore, eating 5 sheets of nori could potentially take you up to 625 mcg. This is still only about half the tolerable upper limit for iodine, but if you do have thyroid problems you may just want to limit your intake to one sheet every now and again. Be aware though, all these calculations are just an estimate!!
      Changing foods you like is always hard, but this video suggests a good snack option!




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  30. How about samphire/glasswort, which I understand is a sea vegetable rather than seaweed. Is this a good enough source of iodine?




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  31. Should I still take the recommend dose of 150mcg if I eat a lot of potatoes and some broccoli? I eat NO sea vegetables and do NOT add iodized salt to my food just for the record.




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  32. Sushi Chefs cook rice with kombu, I have read read that even small amounts of Kombu have dangerously high amounts of iodine and that iodine gets into the rice water really quick.

    So i wonder can i savely eat Sushi, or will the be iodine content be too big?




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  33. Thanks for the info, also thank for the time your took. No i was actually talking about kelp. I do not know how common it is but i read on the net that Sushi Rice is cooked with a sheet of kelp called Konbu, pronounce Kombu. When i wanted to buy some of it for Sushi in the Supermarket it says even a gram is dozens/hundreds or so of times above the save limit. When i looked it up a bit on the Internet i read that the iodine gets released to the water really quick.

    So i wanted to know how save Sushi actually is, if its true that Rice gets cooked with a sheet of kelp.




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  34. Can you help me please? The video is suggesting kelp should not be consumed but most of the iodine supplements are kelp based. Is it okay to have a kelp based iodine supplement? If not, what supplement would you suggest?




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  35. Hi Hannah,

    I am a volunteer for Dr. Greger. Thank you so much for your question.

    The reason Dr. Greger recommends avoiding kelp is just because the amounts in which people typically consume it can cause elevated levels of iodine, which can be dangerous. But if you just take a kelp based supplement, make sure your daily intake is around 150 micrograms a day.

    I hope this helps answer your question!




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  36. I became vegan about 3 years ago. Since that time, my previously normal TSH levels have become elevated, most recently the reading was 8.93 mU/L. I do take an iodine supplement (Indoral) that I started a few years ago. My MD has me taking 25mcg Levothyroxine. Could this change in the TSH be due to being vegan and/or the iodine supplement?




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  37. I need help please, I understand kelp is not recommended because of high dosage of iodine. but how about sea kelp supplements containing 150 mcg from Natures garden brand? please let me know.




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  38. I need help please, I understand kelp is not recommended because of high dosage of iodine. but how about sea kelp supplements containing 150 mcg from Natures garden brand? please let me know.




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    1. Thanks for your question,

      There has been cases of adverse effects reported with its intake, not only because of high iodine content (1) but also arsenic (2).

      However, as Jack Norrid RD notes (3):

      “It is very unlikely that, taken at recommended amounts of 150 µg every other day, arsenic toxicity is likely to occur from kelp supplements.”

      Hope this answer helps.




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      1. Thank you so much for your answer. a quick question I thought Dr said 150 µg every day but you mentioned every other day. kindly confirm.




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