Q. I heard that if you ingest too much iodine, you can develop hypothyroidism. Is that true? I’m a little confused about why that would happen .
A. Yes – it is true that too much iodine can lead to hypothyroidism. It seems counterintuitive; you’d think that more iodine would lead to more thyroid hormone production. However, it does seem that there is a link between excessive iodine intake and autoimmune thyroid disease (leading to hypothyroidism).Recently, researchers from China have found that too much iodine leads to an influx of lymphocytes, for some reason, and an increased incidence of self attack on the thyroid:
“…although iodine supplementation should be implemented to prevent and treat iodine-deficiency disorders, supplementation should be maintained at a safe level. Levels that are more than adequate (median urinary iodine excretion, 200 to 299 µg per liter) or excessive (median urinary iodine excretion, >300 µg per liter) do not appear to be safe, especially for susceptible populations with either potential autoimmune thyroid diseases or iodine deficiency. Supplementation programs should be tailored to the particular region. No iodine supplementation should be provided for regions in which iodine intake is sufficient, whereas salt in regions in which iodine intake is deficient should be supplemented with iodine according to the degree of iodine deficiency.”
The underlying mechanism hasn’t been entirely worked out – but there does seem to be a link. So: adequate (but not excessive) iodine supplementation is important in iodine-deficient regions, whereas people in iodine-rich regions should not ingest additional iodine.
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- Ephriam Bam said Thanks very much for your simple and clear explanation!
- Marina P said Professor Thomas Renne from Sweden and his group conduct research on the topic of FXII, I found it m...
- sachini said Very important this one.thank you
- Jeevanshu Dhawan said That is the most simple explanation I have read till date. Thanks.
- pooja said Great explanation. Thank you
- Sandhya said Kristine, you are a teacher non-pareil !
- Lilah said Thanks looking forward for the bites
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- VAISHALI said STILL I DONT UNDERSTAND-LOWER NORMAL RANGE IS 4.0 x 103/μL THAT MEANS IN 1uL THERE ARE 4000 CELLS,SO...
- Devender Singh said good
- LILAH said SOOO GOOD