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BMJ Case Rep. 2014 Oct 29;2014. pii: bcr2014206330. doi: 10.1136/bcr-2014-206330.

Thyroid dysfunction following a kelp-containing marketed diet.

Author information

1
A.O.R.N. dei Colli Hospital, Naples, Italy.
2
University of Salerno, Baronissi, Salerno, Italy.
3
University of Molise, Campobasso, Italy.

Abstract

Complementary medications and herbal medicine for weight loss have become very popular. We report a case of thyroid dysfunction following the ingestion of a kelp-containing marketed diet in a 45-year-old woman with no previous thyroid disease. Signs of hyperthyroidism occurred shortly after a kelp-containing diet. Hyperthyroidism lasted 2 months and was followed by an overt hypothyroidism. The thyroid scintiscan exhibited an extremely low uptake and colour-Doppler ultrasonography revealed multiple small areas of pulsatile flow. After 3 months of levothyroxine substitutive therapy, normal thyroid function was recovered after levothyroxine discontinuation. This clinical history is compatible with a case of iodine-induced thyrotoxicosis followed by prolonged block of the sodium-iodide symporter activity as a consequence of excessive iodine consumption from kelp. Consumers of marketed diets containing kelp or other iodine-rich ingredients should be advised of the risk to develop a thyroid dysfunction also in the absence of underlying thyroid disease.

PMID:
25355748
PMCID:
PMC4216876
DOI:
10.1136/bcr-2014-206330
[Indexed for MEDLINE]
Free PMC Article

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