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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.
But in animals it takes 10 to 12 weeks for lead exposure to result in hypertension, and in humans it likely takes years to decades, Vaziri says. One possible reason is that the body launches a variety of defense mechanisms that prevent or minimize rapid rise in blood pressure and gross tissue damage.