05/24/2026
🧠Did you know that over half of Americans alive today were exposed to harmful levels of lead as young children, and it’s likely impacted their brain development?
For decades, lead was everywhere: in our gasoline, paint, water pipes, and even toys. While we knew about some of the harms from lead as far back as 400 BC, it wasn’t until the 1970s that we began to regulate lead emissions and use.
As we learned more about lead, we discovered that even tiny amounts of lead are dangerous, especially for developing brains. The blood lead reference value (BLRV) that was once considered “safe” was 60 micrograms per deciliter (µg/dL) in the 1960s, then it dropped to 10 in the 1990s, then 5, and as of 2021, it’s 3.5 µg/dL. 📉
🚫 As we now know, there is no known safe level of lead in a child’s blood.
According to a 2022 study in PNAS, early childhood lead exposure has caused a loss of 824 million IQ points across the US population, as of 2015!
👵🏽👴🏻 Americans born between 1950 and 1980 were hit hardest, with nearly universal elevated blood lead levels (BLL) and average IQ losses as high as 5.9 points per person.
On an individual level, losing a few points isn’t too big of a deal, but even a small drop in average IQ across a whole population means fewer people at the top (like scientists and doctors), more people struggling at the bottom, and big impacts on education, jobs, and the economy. What seems small for one person adds up to a huge shift when it happens to millions.
And children are still being exposed, thankfully in lower amounts, but those amounts still matter. Millions of kids in the US have had lead in their blood that is above the current safety threshold. 😪
The best ways to lower lead exposure on an individual level include:
✅Regularly cleaning & dusting your home
✅Filtering drinking water
✅Eat a diet rich in Vitamin C, calcium, and iron, which can minimize lead absorption
We also need to advocate for stricter regulations on polluting industries that still pump lead into our environment! Gimme a ✊if you agree!
References: PMID: 35254913