Population-Level Changes in Folate, Iodine, and Vitamin D Status over More than 20 Years: Biomarker Data from the Cross-Sectional National Health and Nutrition Examination Survey (NHANES 1999-2000 through August 2021-August 2023).

Curr Dev Nutr · 2026 · PMC13185982 · PMID 42163862

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a decreasing trendno p-value reported

UI is used to assess recent dietary iodine intake and showed a decreasing trend from 2001–2002 to 2017–2018, with median UI concentrations declining by ∼25%–30% both in persons aged ≥6 y and in WRA.

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