Cadmium found in most tested Swiss food products, raising cumulative-exposure concerns

Cadmium appeared in 67 of the 90 food products tested, putting a toxic heavy metal into the daily diet conversation for consumers across Switzerland. The French-speaking Swiss Consumer Federation commissioned laboratory tests on breads, pastries, potatoes, pasta, chocolate, cereals and oat flakes, foods selected because they can contain cadmium absorbed from soil.

None of the products breached current safety standards. That finding means the tested items remain legally compliant. It does not settle the question raised by repeated, low level exposure over time. People may eat several foods from the tested categories in the same week, or even the same day, while cadmium remains in the body for years.

Cadmium is classified as toxic and carcinogenic. According to the study information reported by RTS and Swissinfo, long term accumulation can harm the kidneys and weaken bones. The issue therefore rests on total exposure, not on a single product alone.

The results, published on August 27, 2026, do not identify a contaminated brand or a specific Swiss canton. They point to a broader food chain issue involving soil, crops, fertilisers and imported ingredients. Swiss consumers face exposure through ordinary foods, even when each item individually meets the rules.

The highest reading reached 0.36 mg/kg in one chocolate sample, approximately ten times the level found in bread, pasta or potatoes. Chocolate sits at the centre of the findings because cacao trees can absorb cadmium efficiently from the soil.

Delphine Gilliard, a food testing scientist at the consumer federation, told RTS that cacao takes up more cadmium than oats or wheat. The growing region also matters. Gilliard said American soils generally contain more cadmium than African soils, yet chocolate packaging does not always identify the origin of the cacao clearly enough for shoppers to compare products.

Swiss rules allow higher cadmium limits for chocolate than for some other foods. Those limits reflect the plant’s capacity to accumulate the metal and the practical difficulty of eliminating it from cacao completely. The highest result in this survey still remained within the applicable standard.

The test did not establish that all chocolate carries the same risk. Levels varied by sample and growing area, and the source did not publish a brand by brand ranking. Consumers can, however, treat chocolate as a food where origin and portion frequency may affect their overall exposure. Regulators may also face pressure to improve traceability for cacao used in Swiss products.

Potatoes contained 0.042 mg/kg of cadmium, compared with 0.015 mg/kg in toast, according to the laboratory analysis. The difference illustrates how the part of a plant that people eat can shape exposure.

Potatoes develop directly in the soil. Wheat also takes up cadmium through its roots, but only a small portion reaches the grain, Gilliard explained. That helps account for the lower reading in toast. Cereals and oat products remain relevant because repeated consumption can add small amounts to a person’s cumulative intake.

Cadmium enters agricultural soils through natural geology and through phosphate fertilisers. The metal occurs naturally in certain rocks, while fertilisers can increase its concentration in farmland. Once present in soil, it can move into crops and then into products made from those crops.

The study found no significant difference between organic and conventional products. Organic farming often avoids phosphate fertilisers, although some phosphate fertilisers are permitted under organic rules. Similar levels may reflect natural soil concentrations, historic inputs or other factors that the small survey could not separate. Two packages of Swiss organic oats recorded the lowest cadmium levels in their category, showing that product results can vary even within one farming system.

Every tested product stayed below the applicable safety limit, a point that Swiss authorities and consumers cannot ignore when assessing the findings. Regulatory thresholds are designed to keep individual foods within accepted risk parameters, and the survey did not identify a product requiring an immediate recall.

The unresolved issue concerns combined exposure. A person could eat bread at breakfast, pasta or potatoes at lunch, and chocolate later in the day. The source does not calculate a daily intake for any individual, nor does it show that the tested combination exceeds a health threshold. It does show why monitoring several food categories matters.

A related Swissinfo report published on June 19, 2026, examined Switzerland’s food safety position after a French report raised concerns about high dietary exposure. Switzerland considers consumers protected by its controls, while questions remain about imported food and ingredients. The latest study adds evidence from products available to Swiss shoppers, but its 90 item sample cannot represent the entire national market.

Regulators will need reliable data on soil conditions, cacao origins, fertiliser use and long term dietary patterns. Clearer origin information on chocolate would help consumers understand why two otherwise similar products may contain different amounts of cadmium.

The survey gives Swiss consumers a reason to follow the evidence, not to abandon staple foods. No tested item exceeded the current limit, and the study did not find a meaningful advantage linked to organic labels, Swiss origin or price. Those details make blanket shopping advice difficult.

Consumers can reduce uncertainty by eating a varied diet rather than relying heavily on one food category, particularly products that may accumulate more cadmium. Chocolate deserves attention because cacao absorbs the metal readily and the measured maximum was substantially higher than readings reported for bread, pasta and potatoes. People should also recognise that the source provides no clinical advice for individual patients and no basis for changing medically prescribed diets.

For Switzerland, the next steps are institutional. Authorities can expand testing across regions, brands and imported ingredients, publish results in a form shoppers can use, and investigate why product packaging often omits cacao origin. Researchers can examine how natural soil concentrations, phosphate fertilisers and farming practices interact over time.

The current record is reassuring on immediate compliance and incomplete on cumulative exposure. That distinction should guide the next round of Swiss food monitoring, especially for foods eaten frequently and for products whose raw materials come from regions with higher soil cadmium levels.