Sydney: Iodine deficiency leaves one third of the world`s population exposed to adverse health conditions that can cause everything from mild learning difficulties to severe retardation, cretinism and stillbirth, warns a scientist.The warning comes from pioneering Australian medical scientist Basil Hetzel more than 40 years after his seminal studies illuminated iodine`s essential role in brain development.In Papua New Guinea in the 1960s, Hetzel`s research team was the first to prove that brain damage could be prevented by correcting iodine deficiency before pregnancy, according to a Sciencealert statement.
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