The Claim

Thyroglobulin concentrations increase linearly with higher iodine intake in children aged 7–14, with a β coefficient of 0.5 μg/L per μg/d increase, but the prevalence of thyroglobulin levels exceeding 40 μg/L remains consistently above 3% across all iodine intake levels, indicating that thyroglobulin is not a reliable marker of iodine excess.

Source: Adverse effects on thyroid of Chinese children exposed to long-term iodine excess: optimal and safe Tolerable Upper Intake Levels of iodine for 7- to 14-y-old children.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
44score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

In children aged 7 to 14, higher iodine intake is associated with a predictable rise in thyroglobulin levels, but the proportion of children with very high thyroglobulin levels stays above 3% regardless of how much iodine they consume, suggesting that this measure cannot reliably identify excess iodine.

See the scientific wording

Thyroglobulin concentrations increase linearly with higher iodine intake in children aged 7–14, with a β coefficient of 0.5 μg/L per μg/d increase, but the prevalence of thyroglobulin >40 μg/L remains consistently above 3% across all intake levels, indicating it is not a reliable marker of iodine excess.

Why this might work

When children consume more iodine, their thyroid glands make more thyroglobulin protein to store it, but the gland cannot remove the extra protein fast enough, so it builds up in the blood. Even with much more iodine, the amount of thyroglobulin that spills over into the blood stays above a certain level because the gland always makes at least that much, no matter how much iodine is available.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Adverse effects on thyroid of Chinese children exposed to long-term iodine excess: optimal and safe Tolerable Upper Intake Levels of iodine for 7- to 14-y-old children.

    In kids aged 7 to 14, eating more iodine makes a certain thyroid protein go up in a predictable way, but the number of kids with very high levels of that protein stays about the same no matter how much iodine they get — so it’s not a good way to tell if they’re getting too much iodine.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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