Why too much fluoride might make your neck swell
Iodine Modifies the Susceptibility of Thyroid to Fluoride Exposure in School-age Children: a Cross-sectional Study in Yellow River Basin, Henan, China
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Iodine doesn’t just prevent deficiency—it actively reduces fluoride’s harm, especially at moderate levels (≤300 μg/L).
Most assume more iodine is always better, but here, moderate iodine was the sweet spot where fluoride most disrupted TT3—suggesting a delicate balance, not a linear relationship.
Practical Takeaways
Ensure kids get enough iodine through iodized salt, dairy, eggs, or seaweed—especially if they live in a fluoridated area.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Iodine doesn’t just prevent deficiency—it actively reduces fluoride’s harm, especially at moderate levels (≤300 μg/L).
Most assume more iodine is always better, but here, moderate iodine was the sweet spot where fluoride most disrupted TT3—suggesting a delicate balance, not a linear relationship.
Practical Takeaways
Ensure kids get enough iodine through iodized salt, dairy, eggs, or seaweed—especially if they live in a fluoridated area.
Publication
Journal
Biological Trace Element Research
Year
2021
Authors
Yuhui Du, Guoyu Zhou, Biao Gong, Jun Ma, Ning An, Minghui Gao, Meng Yang, Qiang Ma, Hui Huang, Q. Zuo, Y. Ba
Related Content
Claims (5)
Boys' thyroids tend to get bigger than girls' when they're exposed to fluoride in water or food, which suggests boys might be more sensitive to fluoride's effects on their thyroid gland.
When kids have just enough iodine in their urine but are exposed to more fluoride, their bodies might make less of an important thyroid hormone called TT3 — like their thyroid is struggling a bit under those conditions.
In kids aged 7 to 12, the more fluoride they have in their urine, the bigger their thyroid gland tends to be — by a tiny amount, about the size of a small grape.
When kids have more iodine in their urine, fluoride doesn’t seem to make their thyroid gland grow as much—so iodine might help protect their thyroid from fluoride’s effects.
In kids, more fluoride in their urine seems to be linked to bigger thyroids, but iodine in their urine doesn’t seem to make a clear difference—so fluoride might be the main thing affecting their thyroid size.