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Iodine in pregnancy

Two hundred micrograms a day, up from 150 — a third more, and one of the largest pregnancy increases in the table. The reason is blunt: for the first months, fetal brain development runs entirely on the mother thyroid hormone.

Nota de la EFSA en esta fila:elevado en un tercio para el desarrollo cerebral fetal

Son valores de referencia poblacionales publicados, no un diagnóstico ni una receta. Una ingesta de referencia describe lo que cubre a un grupo sano; no puede decir su propio estado, y ninguna página puede. El embarazo, la enfermedad crónica, los medicamentos y la malabsorción cambian el cuadro: lleve esas preguntas a un médico, una matrona, un farmacéutico o un dietista.

The timing is the whole argument

The fetal thyroid does not begin producing hormone until partway through pregnancy. Until then, every bit of thyroid hormone reaching the developing brain comes from the mother, and thyroid hormone is built around iodine atoms. Maternal iodine supply in early pregnancy is therefore an input to fetal neurodevelopment in a very direct sense.

The window opens before most women know they are pregnant, which is the same structural problem as with folic acid. It is one reason iodine sufficiency is treated as a matter for women of childbearing age generally, not only for those already pregnant.

Why this is a live issue in the Nordic and Baltic countries

Iodine intake in this region has been a recurring public-health concern, and women of childbearing age have repeatedly been the group closest to the line. The mechanisms are ordinary. Sea salt and rock salt are usually not iodised, so the shift away from iodised table salt removes iodine. Salt-reduction advice, which is correct on its own terms, reduces the vehicle. And dairy, another significant carrier, is often reduced or replaced without a fortified substitute.

None of that is an argument for eating more salt. It is an argument for buying iodised salt when you buy salt, and for knowing where else your iodine comes from.

Where it comes from, and the one to avoid

Iodised salt, milk and dairy, sea fish and eggs are the practical sources in this region. The site food database does not carry iodine values, so this page describes sources rather than ranking them — inventing numbers would be worse than leaving the table out.

Seaweed is the exception that needs a warning rather than a recommendation. Kelp products can carry thousands of micrograms per gram, enough to exceed the 600 microgram adult upper level many times over in a single serving, and both too little and too much iodine disturb the thyroid. Kelp supplements are not a sensible way to cover pregnancy iodine.

This one belongs with your midwife

Thyroid function in pregnancy is monitored clinically where there is reason to, and thyroid disease in pregnancy is managed by specialists. Iodine supplementation in pregnancy is recommended in some countries and handled through diet in others, and the right answer depends on the local food supply as much as on the individual.

Ask at your antenatal appointment. It is a one-sentence question with a locally correct answer, which is more than any reference table can give you.

Cómo se compara esto con cada otro grupo

Comida ordinaria frente athe 200 µgcifra paraembarazo

La instantánea de composición de alimentos detrás de este sitio no llevayodovalores, así que no hay una tabla calculada en esta página. Inventar números sería peor que omitirlo;las secciones de arriba describen de dónde viene en su lugar.

Todo el nutriente, no solo este grupo

The Yodopágina de ingesta de referencia lleva la tabla completa de edad y sexo, el nivel superior y lo que significa el tipo de valor.

Páginas relacionadas

Fuentes:valores de referencia dietéticos de la EFSA · Reglamento (UE) n.º 1169/2011, anexo XIII · USDA FoodData Central SR Legacy (composición de alimentos) · Dictamen científico de la EFSA sobre valores de referencia dietéticos para el yodo (2014) · Directriz de la Organización Mundial de la Salud sobre deficiencia de yodo y yodación de la sal· comprobado2026-09-06

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