Cadmium and the Questions Ireland Isn't Asking
An absence of evidence risks being mistaken for evidence of absence.
France recently discovered something worrying.
Its national biomonitoring programme found levels of cadmium exposure significantly higher than expected, among large parts of the population. The source was not a major industrial accident or a contaminated water supply. Rather, exposure appeared to arise from foods consumed every day: cereals, vegetables, potatoes and other staples. Some findings suggested that younger age groups may face particular risks from long-term exposure.
The obvious question for Ireland is whether the same pattern exists here.
The answer is surprisingly simple.
We do not know.
That uncertainty matters. Not because there is evidence of a cadmium crisis in Ireland, but because cadmium is precisely the kind of contaminant that rewards early attention and punishes late discovery.
Unlike many environmental hazards, cadmium accumulates slowly. It enters the body through diet and can remain there for decades, concentrating in the kidneys and bones. Scientists have linked long-term exposure to kidney disease, bone demineralisation and other health effects. It is not the sort of contaminant that produces immediate headlines. If a problem emerges, it is likely to do so gradually, over many years.
France’s experience is therefore instructive. The concern did not arise because officials suspected a problem. It arose because they measured and discovered one.
Ireland has not undertaken comparable population-level biomonitoring. While environmental agencies monitor cadmium in certain soils, waters and industrial settings, we have no national dataset capable of showing whether exposure among the population is low, moderate or potentially concerning. In effect, Ireland lacks a baseline.
That absence of evidence risks being mistaken for evidence of absence.
There are reasons why the question deserves attention. Ireland is not France, and there is no reason to assume identical exposure levels. Our agricultural systems differ in important respects. Yet some of the underlying conditions are familiar. Ireland imports phosphate fertilisers whose cadmium content can vary significantly depending on their source. Much of the country’s soil is naturally acidic, a factor known to increase cadmium uptake by plants. Potatoes, an important part of the Irish diet, are among the crops capable of accumulating cadmium from the soil.
None of this demonstrates that Ireland has a problem. It does suggest that Ireland has grounds for asking the question.
The issue is especially important because environmental exposures often affect generations differently. Children can be more vulnerable to certain contaminants than adults, both because their bodies are still developing and because they have longer lifetimes over which cumulative effects may emerge. That is one reason why public-health monitoring matters. It allows policymakers to identify potential risks before they become entrenched.
France’s experience offers a useful lesson. Not that Ireland should be alarmed, but that it should be curious.
Good public policy is often an exercise in prudence. We test drinking water before people become ill. We monitor air quality before respiratory diseases appear in statistics. We inspect food systems before contamination incidents occur. The purpose is not to create fear. It is to reduce uncertainty.
Cadmium deserves the same approach.
A modest national biomonitoring programme, combined with updated information on fertiliser inputs and soil concentrations, would provide Ireland with something it currently lacks: knowledge. Such measures would not confirm the existence of a problem. They would simply allow the country to determine whether one exists.
France’s findings do not tell us that Ireland has a cadmium issue. They tell us something more uncomfortable: Ireland does not know whether it has one.
For a contaminant that accumulates over decades and may affect future generations as much as the present one, that uncertainty alone seems reason enough to ask the question.
Journalist’s Note
This article began as a question rather than a conclusion. Readers who would like to see the research behind it can find my original notes in Field Notes.
Field Notes is a record of the questions, sources, documents and observations that sit behind my published work. The material is presented largely as gathered and should be regarded as research rather than finished journalism.
My intention is simple: to make the origins and development of my work visible, and to allow readers to examine the evidence and reasoning for themselves.