How many IQ points has lead exposure cost humanity?

An estimated 554 billion IQ points have been lost globally due to lead exposure across exposed birth cohorts in the twentieth century. In the United States, 170 million Americans — roughly half the population — were exposed to adverse lead levels in early childhood according to McFarland et al. 2022.

What is the Prevention Paradox in lead exposure?

The Prevention Paradox, documented by Bruce Lanphear, refers to the finding that protecting children with blood lead levels above 5 µg/dL prevents only 18% of total lead-related cognitive damage. The other 82% of harm occurs at blood lead levels below that threshold — levels that regulatory frameworks historically considered safe. The steepest part of the lead dose-response curve is at the lowest exposures.

Does lead exposure affect adults as well as children?

Yes. A 2018 Lancet Public Health study by Lanphear et al. linked blood lead levels at or above 2.2 µg/dL in adults to significantly elevated cardiovascular disease risk — heart attack and stroke — attributed to over 400,000 deaths per year globally. This cardiovascular threshold is lower than the 3.5 µg/dL child blood lead reference value.

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