Banned Substances in Supermarket Food: What Consumers Should Know

People walking through a supermarket generally feel reassured: products appear inspected, safe and properly regulated. The reality is less comfortable. Imports, loopholes and incomplete checks mean that foods containing substances which should no longer be consumed here repeatedly turn up in Germany and elsewhere in Europe. This affects far more than exotic specialities: breakfast cereals, sweets, drinks, fruit and vegetables are involved too.

Dangerous colourings at breakfast: what is in children’s products

A recent example from a French consumer programme illustrates just how close this issue is to everyday family life. A retail expert asked a nutrition specialist to assess several products bought in a major city. The selection was unremarkable: brightly coloured breakfast cereals for children, a jarred gherkin condiment and a chilled peach fizzy drink.

The assessment was alarming:

• Breakfast cereals for children: Several synthetic colourings, including vivid red, yellow and blue dyes, which are associated with hyperactivity and concentration difficulties in children.
• Gherkin product: It contained aluminium sulphate (E520) as a stabiliser, a substance that can put strain on the kidneys and nervous system.
• Peach lemonade: This contained a colouring classified as probably carcinogenic. Just two to three cans a day are enough to exceed the limit regarded as safe.

“Foods that look like harmless treats can contain substances for which authorities have long been showing red cards.”

Products aimed at children are especially concerning. Children weigh less, their metabolism functions differently, and they often snack on the same items every day. Problematic substances can therefore accumulate quickly without parents noticing.

The E171 case: banned in Europe, sold freely from the US

One of the best-known concerning substances is titanium dioxide, often concealed on ingredient lists as E171. This white colouring made sweets, biscuit icing, sugar-coated tablets and even toothpaste brilliantly white and visually “perfect”.

Following several studies that indicated a possible cancer risk, the EU removed E171 entirely from the list of permitted food ingredients. Since 2020, the substance has officially been prohibited in food in Europe.

Yet E171 still reaches shop shelves, simply by indirect routes. Titanium dioxide remains authorised in the United States. Imported sweets, breakfast cereals and baked goods from North America may therefore still contain the colouring. Provided goods formally meet import requirements or do not attract attention, they can end up on the shelves of specialist shops and even major supermarkets.

Consumer protection groups describe this as a “regulatory gap”: a substance may be banned locally but can effectively re-enter the market in imported processed foods.

Pesticides in fruit and vegetables: banned but still in the basket

The debate does not stop with additives. An environmental television programme commissioned tests on fruit and vegetable samples from major retail chains. Imported produce, especially from Asia and South America, was the focus.

The laboratory findings seemed like a return to an earlier era:

• Pomelos from China: Two substances classified as harmful to reproduction were detected.
• Grapes from Peru: Residues of several pesticides were found, including an agent considered a contributing factor in the decline of bees and insects.
• Other products: Tea, coffee and other imported goods showed traces of substances that may no longer be applied to fields in Europe.

Many of these active substances have disappeared from the EU market because of long-term risks, including potential effects on hormones, fertility or the nervous system. They continue to be sprayed in other countries to maintain yields and control pests.

“Anyone choosing exotic fruit or bargain vegetables in the supermarket sometimes brings chemical legacy contaminants home that have long been banned here.”

How do banned products get through at all?

The EU is a single market, and that is precisely what creates difficulties. Goods can arrive in one Member State and then move on to other countries almost freely. Where certain inspections take place only at the first port of entry, it becomes much harder to monitor every shipment comprehensively afterwards.

According to French authorities, more than one million non-compliant products have been imported illegally since 2021. In one uncovered case, a wholesaler in the Paris region stored 17 tonnes of goods that breached current rules, ranging from incorrectly labelled foods to products containing prohibited ingredients.

Such figures suggest that detected cases are only the tip of the iceberg. Many batches are likely to have been consumed long before anyone even takes samples.

What consumers can do in practice

No one can carry out laboratory tests independently on every shopping trip. However, a few everyday measures can substantially reduce the risk.

Check origin and avoid import traps

• Choose regional and domestic products where possible: Products made in Germany or with clearly labelled EU origin reduce the risk of exotic pesticides or additives banned in Europe.
• Be cautious with cheap imports: Exceptionally inexpensive sweets, snacks and drinks from overseas may be tempting, but are more likely to contain concerning ingredients.
• Question loose produce: At markets or food stalls, it is worth asking about origin and supplier, particularly for fruit, vegetables and herbs.

Read ingredients, even when it is tedious

The ingredients list remains the most important tool. Regular shoppers gradually learn to spot typical warning signs.

Anyone overwhelmed by E numbers can use digital support. Apps such as Yuka or Quel Produit scan barcodes and rate products by their risk and nutritional profile. Their assessment does not replace a doctor, but it saves time and reliably filters out many problematic products.

Extra caution for children, pregnant people and frequent consumers

Many limit values are based on an average adult. Children and lighter adults fall well below that weight, yet absorb relatively greater quantities of substances when consuming the same amount.

Someone who drinks the same fizzy drink every day, regularly eats brightly coloured sweets and also consumes a lot of imported fruit reaches ranges that authorities classify as “critical” more quickly. This applies even more to children with low body weight and to pregnant people.

Doctors therefore often offer straightforward advice:

• Treat vividly coloured sweets and drinks as an occasional choice.
• Try new imported brands in small amounts at first and observe any reactions.
• Build variety into the diet rather than repeatedly eating the same processed foods.

Why the issue will become even more important over time

As online retail expands and new import channels continue to emerge, shelf choice increases - as does the risk that problems are detected only late. At the same time, the body of research on the long-term effects of additives, nanoparticles and pesticide cocktails is growing.

A single substance may be considered “acceptable” below its limit value. The so-called “mixture effect” becomes significant when several chemicals act together, even though each individual one remains just below its limit. Research is still working to understand these combinations more fully, and much remains unresolved.

In everyday terms, the fewer highly processed products that go into the shopping basket, the lower the uncontrolled mix of colourings, stabilisers, pesticides and solvents. Choosing fresh, unprocessed foods more often and checking everything else more carefully can already reduce the risk substantially, without giving up enjoyment and convenience entirely.