The story in detail
The researchers examined population iodine status rather than diagnosing individual deficiency. They analysed urinary iodine relative to creatinine in 22,851 US participants aged 14 or older, using surveys conducted from 2001 to 2018. Indicators of inadequate intake increased over time, with women of reproductive age and pregnant participants among the groups of concern.
Changes in the production and consumption of iodized salt, dairy and bread provide context for the findings. However, a population estimate cannot establish an individual’s nutritional needs, and US figures should not be transferred directly to other countries. The study supports closer attention to dietary iodine and vulnerable groups. It does not justify self-prescribing supplements or increasing salt intake without considering the person’s overall diet and health.
Updated: 20 October 2026 · Study date: 2025
What was found?
Data from 22,851 US participants collected during 2001–2018 suggested that inadequate iodine intake became more common.
What does it mean?
Iodine intake needs to be considered alongside food choices and consumption of fortified products. The study does not show that one type of salt alone caused the change.
Limitations
US findings cannot be directly generalized to Türkiye. This story does not recommend eating more salt or taking iodine supplements.
Sources and review scope
English adaptation of the reviewed Turkish edition. The translation preserves its study population, uncertainty and limitations. It is not an independent new study review. Translation checked: 20 October 2026.
Editorial expansion: 21.10.2026
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