For decades, coronary heart disease has been framed almost entirely as a consequence of individual choices — diet, exercise, smoking. A growing body of toxicological evidence is forcing a fundamental reconsideration: industrial lead exposure, accumulated over the 20th century, may have left a measurable vascular imprint on population-level cardiovascular mortality that behavioral risk models systematically undercount.
This correspondence in JAMA engages with a prior editorial arguing that CHD should be understood, at least in part, as a legacy of industrial lead burden. The authors extend that argument by highlighting a critical methodological gap: how lead toxicity is measured and operationalized within clinical and public health frameworks. Blood lead levels — the dominant clinical metric — reflect only recent exposure, not decades of cumulative bone-stored lead that slowly re-enters circulation with age, particularly accelerated by bone resorption in postmenopausal women and older adults. This distinction matters enormously when estimating lead-attributable cardiovascular risk across a population, and current systems may be structurally blind to the chronic, low-level vascular damage that accumulated exposure produces.
The implications extend well beyond historical curiosity. Research from the NHANES cohort and longitudinal studies has repeatedly linked even low-level lead exposure to increased risks of hypertension, left ventricular dysfunction, and cardiovascular mortality, with effect sizes that rival or exceed traditional modifiable risk factors in older age groups. The cardiovascular risk associated with bone lead burden — measurable via K-X-ray fluorescence but almost never assessed clinically — represents a largely invisible exposure layer that standard lipid panels and blood pressure readings cannot capture.
This is confirmatory and clarifying rather than paradigm-shifting science, but it carries meaningful implications for risk stratification in aging populations. Clinicians treating older adults with unexplained cardiovascular risk may benefit from awareness of occupational and residential lead histories, even when blood lead levels appear normal today.
