In utero iodine deficiency affects literacy ability

Researchers reviewed 228 children born when Tasmania had documented population-wide mild iodine deficiency but who grew up in the period when bread manufacturers began substituting iodised salt for regular salt under a voluntary program.

By age nine, children born to mothers who had gestational urinary iodine concentration of <150ug per litre scored lower on spelling, grammar and literacy indicators – but not numeracy indicators – compared to children whose mothers were iodine replete.

J Clin Endo & Metabol 2013; in press