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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.
Lead poisoning and health. 1  Lead is a cumulative toxicant that affects multiple body systems and is particularly harmful to young children.  Lead exposure is estimated to account for 674 000 deaths per year with the highest burden in low- and middle-income countries1.