Q&A: Iodine deficiency

Research has warned that many pregnant women in the UK are not getting enough iodine in their diet.

Mothers who were deficient had children with a slightly lower IQ and worse reading scores in primary school.

Why do we need iodine?

Why is it an issue in pregnant women?

How common is deficiency?

So where do I get it from?

Can I have too much?

What about salt?

So why doesn't the UK add iodine to salt?