Iodine deficiency is the world’s most prevalent, yet easily preventable, cause of brain damage. So whether you want to use IQ or some other measure. The goal of correcting iodine deficinecy is to help avoid significant brain damage for a lot of people (up to 2 billion).
Understanding Global Health details the effect of undernutrition and lack of micronutrients
Measles used to kill about 1 million people per year but 30 million people get measles which left some number of them with brain damage.
2008 had seen improvement to 164,000 deaths from measles.
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