Researchers at Australia’s Commonwealth Scientific and Industrial Research Organisation conducted a survey of seven year olds and lead exposure, which showed an average decrease of four to five IQ points when raised blood lead measurements were recorded between fifteen months and four years of age.192 A 2013 study found that children who sustained lead poisoning and presented with blood lead levels of greater than 10 but less than 20 µg/dL before age three did significantly worse on end-of-grade elementary school exams than children with lower blood lead levels.193 Researchers have also concluded that lead exposure both before and after birth can cause significant memory impairment.194
Lead has, of course, been found to be a neurotoxin in adults as well. Elevated bone lead levels in the elderly have been associated with dementia and other negative mental health issues.195 In a fifteen-year study on the effects of lead in the adult brain, researchers concluded that past exposure to lead may actually be attributable to a significant amount of what the medical profession generally considers “normal” age-related cognitive decline.196
Contributions to cardiovascular disease, the world’s leading killer, and more
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