Lead has been a quiet background force shaping the health and development of generations.

There is a tendency to think that lead pathology has been dealt with, as in largely eliminated. Unfortunately that’s far from the case. While it is true that lead levels in the environment are less than, say, 50 years ago, it is sill incredibly persistent and is carried in human tissues almost permanently. We do not shake off lead so easily and IT’S DEADLY!

You may had read the theory that lead poisoning is probably what sank the Roman empire. They had lead in their plumbing, lead in their baths, lead cookware, even wine sweetened with lead acetate (sapa), and obviously large amounts of the metal has been found in their bodies: over 70 times higher than pre-Roman populations. They were once a brilliant and advanced civilization but maybe they died of being somewhat weakened, relatively infertile and perhaps deranged!1

CHRIS73/CREATIVE COMMONS

Geochemist Clair Patterson (1922 – 1995) published that in our time we are born with 1000 times more lead in our bones than was found among our ancestors centuries ago! Patterson was a strong advocate for the removal of toxic lead from our environment. He also used a uranium-lead isotope to determine that the earth was 4.5 billions years old and he received the Nobel Prize for his great contribution to human knowledge… Oh, no, wait a minute. No he didn’t. Actually he was IGNORED by the Nobel committee, who awarded it instead to two independent workers on the chemistry of organometallic “sandwich” compounds!2

(Yawn)

Here’s something critical you may not know: lead levels in your bones (bone lead) is a perfect monitor for your risk of dying from all causes. 

This startling fact is from The Harvard bone-lead mortality study (?2007–2009).3

You have unsafe levels of lead in your bones even if you have had 100 IV EDTA infusions (aka. IV chelation), slow with sodium EDTA or rapidly with Calcium EDTA.  Rapid Calcium EDTA infusion is proven to take out more lead than the slow but slow infusion is better for those few patients where the primary issue is pathologic calcification, as in vascular calcification or high calcium coronary score.

Remember: hair, blood and urine levels tell you almost nothing about your bone lead score!

From “Safe” to None at All 

There was a time—not very long ago—when a child could carry a measurable burden of lead in their blood and still be considered “fine.” Not healthy, not thriving—just not yet alarming enough to trigger concern. That illusion has been steadily dismantled over the past half century, piece by piece, study by study, until today the conclusion is stark:

There is no safe level of lead exposure in children.

That statement, now widely accepted, represents one of the most profound reversals in environmental health science.

The CDC’s Turning Point (2012)

In 2012, the Centers for Disease Control and Prevention (CDC) formally lowered its reference level for blood lead in children from 10 micrograms per deciliter (µg/dL) to 5 µg/dL, effectively doubling the number of children considered at risk.

This decision, reported by John Gever in MedPage Today, was more than a numerical adjustment—it was a philosophical shift. The CDC also abandoned the term “level of concern,” acknowledging that it falsely implied safety below a threshold.

The agency stated plainly:

“No level of lead in the blood is safe.”

This position was based on recommendations from the Advisory Committee on Childhood Lead Poisoning Prevention, which emphasized that even low-level exposure is associated with measurable harm. The new 5 µg/dL benchmark was not a safety cutoff, but a statistical marker—the 97.5th percentile of U.S. children’s blood lead levels at the time.

The implication was unsettling: what had once been considered “acceptable” exposure was now recognized as biologically active and potentially damaging.

To understand how dramatic this shift was, we have to rewind.

In the mid-20th century, lead poisoning was recognized primarily as an acute condition. Children with very high blood lead levels—often above 60 µg/dL—presented with seizures, coma, or death. These were unmistakable cases.

Chronic lead poisoning, I learned at med school, was characterized as “The dangles and dry colic”, meaning abdominal pains and peripheral nerve damage, leading to weak wrists and difficulty walking.

Lower levels were largely ignored.

This paradigm began to crack in the 1970s, largely due to the work of Herbert Needleman, a pediatrician and psychiatrist who asked a radical question:

What if lead harms children even when it doesn’t cause obvious poisoning?

In a landmark 1979 paper published in the New England Journal of Medicine, Needleman and colleagues measured lead levels in children’s shed baby teeth and compared them with cognitive and behavioral outcomes.

Herbert Needleman. The kid’s hero!

They found that children with higher lead burdens—even at levels far below those causing acute poisoning—had:

• Lower IQ scores

• Reduced attention span

• Increased behavioral problems

This study was explosive. It suggested that lead was not just a poison—it was a neurodevelopmental disruptor at levels previously considered harmless.4

By the 1990s and early 2000s, a new generation of studies confirmed and extended Needleman’s findings.

One of the most influential came from Bruce Lanphear and colleagues:

They found something deeply counter-intuitive: the largest drop in IQ occurred at the lowest levels of exposure! Children whose blood lead rose from 1 to 10 µg/dL experienced a greater IQ decline per unit increase than those at higher levels.

In other words, the dose-response curve was steepest at the low end—exactly where previous standards had assumed safety.5

This pooled analysis of multiple international cohorts revealed something deeply counterintuitive:

Why Are Children So Particularly Vulnerable?

Lead interferes with multiple biological systems central to brain development:

• Synapse formation (disrupting neural connections)

• Calcium signaling (essential for neuron communication)

• Neurotransmitter release

• Gene expression and epigenetic regulation

So much so that a major review by the National Research Council concluded:

Lead exposure during early childhood can cause permanent alterations in brain structure and function, with effects that persist into adulthood.6

Behavioral and Social Effects

• The impact is not limited to IQ.

• Longitudinal studies have linked childhood lead exposure to:

• Increased impulsivity and aggression

• Reduced academic achievement

• Higher rates of delinquency and criminal behavior

Reyes demonstrated that reductions in environmental lead—particularly after the phase-out of leaded gasoline—were strongly associated with declines in violent crime decades later.7

From Treatment to Prevention

By the time of the CDC’s 2012 decision, the scientific consensus had shifted decisively:

• There is no threshold below which lead is harmless

• Effects occur at levels once considered negligible

• Damage is often irreversible

The Advisory Committee emphasized that policies should move away from reacting to elevated blood levels and toward primary prevention—eliminating exposure before it occurs.

The Quiet Reality

The most unsettling aspect of this story is not that lead is toxic—that has been known for centuries.

It is that for decades, “acceptable exposure” was defined not by biology, but by what was economically and politically convenient.

Each time the threshold was lowered—from 60 µg/dL, to 30, to 10, to 5—it wasn’t because lead became more dangerous.

It was because we became more honest about what it was doing all along.

What You Can Do

My old pal the late Garry Gordon was a big activist with lead: he said we older ones should undertake daily chelation for the rest of our lives. He was thinking of oral or rectal chelation with EDTA (which tires after a while, let’s be honest!)

He also used zeolite and found some benefits from daily ingestion of high dose vitamin C, 10 grams or more, plenty of fiber, and other natural chelators (such as pectin and parsley). Garry’s point being that there is new lead coming in daily from water, food and air and from lead released by bone turnover.  

Calcium is the simplest, most underrated intervention. Lead and calcium compete for the same biological pathways. So…

• Low calcium ? more lead absorption

• Adequate calcium ? less absorption + less bone release

Calcium doesn’t exactly “chelate” lead—it prevents it from getting in and coming out of bone.8

Iron status matters more than people realize. Iron deficiency dramatically increases lead uptake. Children with low iron absorb significantly more lead.9

So eat red meat, liver (if you’re open to it), or iron supplementation if deficient. But do NOT take iron supplements without first getting your doctor to measure your serum ferritin levels. Overdosing with iron can be dangerous. No kidding.

OK, that’s it for this week! Not too “heavy” a topic, I hope (joke).

To your good health,
Prof. Keith Scott-Mumby 
The Alternative Doctor

References:

  1. https://www.chemistryworld.com/news/londinium-romans-blood-lead-levels-so-high-they-may-have-lowered-birth-rates/4010808.article
  2. Patterson, Clair C. Contaminated and Natural Lead Environments of Man. Archives of Environmental Health, 11(3), 344–360 (1965)
  3. Circulation. Volume 120, Number 12: https://doi.org/10.1161/CIRCULATIONAHA.108.827121
  4. Needleman, Herbert L., et al. Deficits in psychologic and classroom performance of children with elevated dentine lead levels. New England Journal of Medicine, 300(13), 689–695 (1979)
  5. Lanphear, Bruce P., et al. Low-Level Environmental Lead Exposure and Children’s Intellectual Function: An International Pooled Analysis. Environmental Health Perspectives, 113(7), 894–899 (2005)
  6. National Research Council. Measuring Lead Exposure in Infants, Children, and Other Sensitive Populations. National Academies Press, 1993
  7. Reyes, Jessica Wolpaw. Environmental Policy as Social Policy? The Impact of Childhood Lead Exposure on Crime. The B.E. Journal of Economic Analysis & Policy, 7(1), 2007
  8. Gulson, Brian L., et al. “Dietary calcium supplementation reduces mobilization of lead from bone in lactating women.”Environmental Health Perspectives, 112(3), 2004
  9. Wright, Robert O., et al. “Association between iron deficiency and low-level lead poisoning in an urban primary care clinic.”American Journal of Public Health, 89(7), 1999

 

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