Lead, even in amounts well below levels considered safe for children, is directly associated with attention deficit hyperactivity disorder, a new study found.
Researchers at Oregon Health & Science University studied nearly 400 children between the ages of 6 and 17 years old, including half who were diagnosed with ADHD. They found that those with a certain gene mutation and ADHD had more severe symptoms. The gene appears to protect against lead damage.
Past research has associated lead with ADHD but this study, published in Psychological Science, confirms a tie between the two, said Joel Nigg, lead investigator and director of OHSU's ADHD program.
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