If you don't have enough to worry about when it comes to your kids, you can now add manganese to your list. Although the trace mineral is necessary for all living things, it can cause brain damage in high amounts. In this particular study, when all other factors were ruled out, kids drinking tap water with the highest concentrations of manganese had an IQ that measured SIX POINTS below children with little or no manganese in their water. And the scientists found that manganese from drinking water is metabolized differently than from food. Apparently absorption is decreased during digestion. Here's the study: http://psychcentral.com/news/2010/09/23/manganese-in-childrens-drinking… The good news is that filters have since been installed - and IQ can be increased through brain training since it's basically a measurement of cognitive skills (which can be strengthened).
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