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Recommending iodine supplements to all pregnant women could save the NHS money, say researchers.
A study in The Lancet concluded that if all pregnant women took a daily dose, it could boost children's IQ scores, causing health improvements.
Iodine is important for healthy brain development and there is some evidence that the UK population may not be getting enough.
But Public Health England (PHE) said a varied diet should offer enough iodine.
"The longstanding government advice is that everyone including pregnant women should be able to get all the iodine they need from a varied and balanced diet," said Dr Louis Levy, head of nutrition science, diet and obesity, at PHE.
Severe iodine deficiency has long been known to cause impaired neurodevelopment in unborn children.
But the picture is less clear in countries such as the UK where iodine intake may only be slightly below recommended levels.For more click here