Iodine intake changes urinary fluoride levels

Comments on current issues in fluoride/thyroid research.
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Iodine intake changes urinary fluoride levels

Post by wendy »

Urinary fluoride does not necessarily reflect fluoride intake, as iodine intake can change UF levels.

Zhou et al. (2008) showed that the urinary fluoride levels were lower in iodine-deficient patients who were taking iodine preparations compared to normal people taking no supplements, but with identical fluoride intake.

In the study by Sun et al (2013), when iodine supplement (salt) use was stopped for two months, urinary fluoride levels increased while urinary iodine decreased - with identical fluoride intake.

Studies by Zhao on F-/I interaction in mice (1998) showed that under "fluoride-deficient" conditions, MORE fluoride is deposited in bone with increasing iodine intake, indicating less fluoride is excreted.

Sun Ning, Chen Gan, Xie Zhiqiang, Wang Yanli, Zhang Li, Hao Zongyu, Zheng Heming - "Study on the correlation of iodine and fluoride excretion in drinking water with normal fluoride and iodine" Contemporary Medicine 18 (2013) ... 84c1b.html

Zhou BQ, Wang WL, Zhuang JF - "Research on correlation of urinary iodine and urinary fluoride" Modern Preventive Medicine 35(17): 3411-3412 (2008)

Zhao W, Zhu H, Yu Z, Aoki K, Misumi J, Zhang X -"Long-term Effects of Various Iodine and Fluorine Doses on the Thyroid and Fluorosis in Mice" Endocr Regul 32(2):63-70 (1998)
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