Lead Poisoning Still Raises Heart Disease Risk Decades Later: New JAMA Study Reveals Hidden Environmental Threat

The Silent Cardiovascular Killer That Never Leaves Your Body

Lead may be out of gasoline and paint, but it's not out of our hearts. A groundbreaking study published in JAMA reveals that lead exposure continues to harm cardiovascular health decades after initial contact, moving lead from 18th to 8th place on the global list of leading risk factors for death by coronary artery disease.

Key Findings from the Landmark JAMA Study

The comprehensive analysis followed more than 42,000 people aged 18 to 90 years old from 1988 through 2013, using data from the U.S. National Health and Nutrition Examination Survey (NHANES). The researchers measured lead levels in bones—a more accurate indicator of lifetime exposure than blood tests—and tracked cardiovascular outcomes through 2015.

Critical statistics:

• More than 1,700 cardiovascular deaths were recorded during follow-up
• Globally, authors attributed 3.5 million deaths in 2023 to lead exposure
• Lead's ranking as a cardiovascular risk factor jumped from 18th to 8th place worldwide

How Lead Damages Your Heart and Blood Vessels

Lead is dangerous because it weakens blood vessels from the inside through multiple mechanisms:

Oxidative stress: Lead exerts oxidative stress on blood vessel cells, causing inflammation and damage over time.

Nitric oxide interference: Lead interferes with nitric oxide production, a molecule essential for keeping blood vessel linings flexible and blood pressure under control. This disruption leads to hardened arteries that can bring on heart attacks and strokes.

Mineral displacement: Lead enters cells through the same pathways used by essential minerals like calcium, iron, and zinc. Once inside, it displaces these vital nutrients and becomes deposited in bones, creating a reservoir that slowly releases lead back into circulation throughout your lifetime.

Why Lead Lingers for Decades

Unlike many environmental toxins that the body can eliminate, lead accumulates in bone tissue and remains there indefinitely. As we age, especially with conditions like osteoporosis and menopause, lead leaches out from bones and circulates in red blood cells, directly increasing blood pressure and cardiovascular risk.

"People born in the 1930s and 1940s had the most lead exposure and the worst outcomes," explains Jeffrey Stanaway, associate professor of health metrics sciences at the Institute for Health Metrics and Evaluation and co-author of the JAMA study. "While lead exposure levels are going down, you have a cohort of people now who are older and in the age groups that are at highest risk for cardiovascular disease mortality, who also grew up during a period when lead exposure was the highest."

Current Sources of Lead Exposure

Despite regulatory progress, lead remains present in many everyday environments:

Housing:

• Chipping or peeling paint in homes built before 1978
• Lead dust from old paint during renovations
• Lead pipes and plumbing fixtures

Water:

• Contaminated drinking water from lead service lines
• Flint, Michigan and Milwaukee are recent examples of widespread contamination

Soil and Air:

• Soil near airports, highways, or factories
• Areas around lead-acid battery manufacturing facilities
• Food grown in contaminated soil

Consumer Products:

• Some imported candies and traditional medicines
• Certain cosmetics from unregulated sources
• E-cigarettes and electronic waste
• Imported toys and jewelry

Occupational Exposure:

• Lead-battery recycling (particularly in lower-income countries)
• Manufacturing and industrial work
• Certain hobbies involving lead materials

The Historical Context

Lead's ill effects have been known since the Roman Empire. Scientists from that era recognized it was better to drink water from clay pipes rather than lead pipes after observing people getting sick. However, the industrial age brought massive amounts of lead into air and water systems.

The parallel curves: Researcher Ana Navas-Acien, a physician-epidemiologist at Columbia University, noticed a striking pattern during her Ph.D. studies. The rise and fall of lead exposure in the United States mirrored almost exactly the trajectory of cardiovascular disease deaths. When lead was removed from gasoline and paint about 50 years ago, heart attack deaths began to plunge.

"This study reframes coronary heart disease," says Bruce Lanphear, professor of health sciences at Simon Fraser University. "This and other research show that a large share of heart disease bears the imprint of industrialization. Lead, air pollution, and secondhand smoke aren't side notes—they're central to the story."

Global Inequity in Lead Exposure

While wealthy nations have made significant progress reducing lead exposure, the problem has shifted rather than disappeared. "As wealthy countries reduced use, industry shifted to lower-income countries," Lanphear explains. "The exposure didn't end—it moved."

Workers in Africa and other developing regions often face high lead exposure in battery recycling operations for the U.S. auto industry—work that would be prohibited by regulation in wealthier countries. This global equity issue means cardiovascular disease burden from lead will continue affecting populations worldwide.

What You Can Do to Reduce Your Risk

Dietary protection: Eating a diet rich in calcium, iron, and zinc can help block some lead absorption. These essential minerals compete with lead for cellular entry points.

Home safety:

• Hire certified lead inspectors to test older homes
• Use lead-safe renovation practices in pre-1978 properties
• Test drinking water for lead contamination
• Clean regularly to reduce lead dust accumulation

Medical monitoring: Healthcare providers can perform blood lead tests if exposure is suspected. The CDC uses a blood lead reference value of 3.5 micrograms per deciliter (µg/dL) to identify children with elevated levels.

The American Heart Association Weighs In

A 2023 statement from the American Heart Association officially recognizes lead as an added risk factor for cardiovascular disease, alongside traditional factors like hypertension, high cholesterol, diabetes, obesity, smoking, and sedentary lifestyle. The organization invoked the term "environmental cardiology," acknowledging that exposure to toxic metals and pollutants represents an important, modifiable component of cardiovascular risk.

Why This Research Matters

"This moves lead from being considered primarily a neurodevelopmental toxin in children to a recognized major cardiovascular risk factor across the lifespan," Navas-Acien told STAT News. "Yes, cardiovascular disease is an environmental disease. For so many decades the environmental contributions were completely overlooked, completely ignored."

The study's authors emphasize that understanding lead's role in heart disease requires looking at direct effects rather than just blood pressure changes—previous analyses focused on how much lead increased blood pressure as an indirect predictor, while this new work examines lead's direct cardiovascular impact.

The Path Forward

Sustaining efforts to eliminate lead exposure is vital for long-term cardiovascular health benefits. "We really do need lead exposures not only to decline, but to stay low to get the long-term benefits in cardiovascular disease," Stanaway emphasizes. "Since the cardiovascular damage is a long-term cumulative risk, maintaining low exposure levels is critical."

Lanphear concludes with an urgent message: "Lead is still everywhere, and we know how to eliminate it. What's missing isn't knowledge—it's urgency."

References

1. Stanaway JD, et al. The burden of disease attributable to lead exposure. JAMA. 2026;335(XX):XXX-XXX. DOI: https://jamanetwork.com/journals/jama/fullarticle/10.1001/jama.2026.2197

2. Cooney E. Lead still raises risk of heart disease, years after exposure, study warns. STAT News. March 30, 2026. https://www.statnews.com/2026/03/30/lead-exposure-cardiovascular-risk-factor-jama-study/

3. Navas-Acien A, et al. Lead poisoning. New England Journal of Medicine. 2024. DOI: https://www.nejm.org/doi/pdf/10.1056/NEJMra2402527

4. American Heart Association. Lead exposure and cardiovascular disease: A scientific statement. Journal of the American Heart Association. 2023. https://www.ahajournals.org/doi/10.1161/JAHA.123.029852

5. Centers for Disease Control and Prevention. Childhood Lead Poisoning Prevention. https://www.cdc.gov/lead/prevention/index.html

6. U.S. Environmental Protection Agency. Lead. https://www.epa.gov/lead

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Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider for personal health concerns or before making any changes to your healthcare regimen.