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Scientists know that lead exposure during childhood harms the developing brain and nervous system, but it is not clear if childhood lead exposure has long-lasting effects on adult brain function. Changes in adult intelligence quotients â IQs â is a way to measure effects of lead and other neurotoxic substances.
Like calcium, lead stays in the bloodstream for a few weeks. Then it is deposited into the bones, where it can stay for a lifetime. Even small amounts of lead can permanently harm children over time, leading to learning disabilities, behavior problems, decreased intelligence, and other damage.