The Allergen Labelling Call
A bakery makes a range of biscuits on shared equipment. One line uses sesame seeds; another uses peanuts. Cleaning between runs involves brushing and a wet wipe, but the nut line runs first each morning and the sesame line second. A new customer asks whether the plain shortbread is nut-free. The owner knows the shortbread recipe contains no nuts, but the equipment is shared. The bakery has no validated cleaning procedure and no allergen testing. A staff member suggests adding 'may contain traces of nuts' to every product to be safe. Another says this will scare customers away and is unnecessary because the recipe has no nuts.
1. Evaluate the two staff positions and recommend how the bakery should label and manage the shortbread, with reference to allergen risk and food law principles.
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Position 1 - label everything 'may contain traces'. This is over-inclusive. Precautionary allergen labelling should be used only when a real, assessed risk cannot be removed by controls. Applying it to every product reduces choice for allergic consumers, undermines trust in the label, and is not a substitute for cleaning. It may also be inaccurate if the risk is actually manageable.
Position 2 - no label because the recipe has no nuts. This is unsafe. Allergen risk comes from cross-contact as well as ingredients. Shared equipment, brushes and surfaces can carry peanut protein onto the shortbread. Peanut is a major allergen and can cause severe reactions at very low doses. The absence of nuts in the recipe does not make the product nut-free.
Recommended approach.
- Assess the risk. Map the process: nut line first, sesame second, shortbread where? Identify every point where peanut could contact the shortbread.
- Control the risk. Introduce a validated cleaning procedure between the nut line and any nut-free product - dismantle equipment, clean and inspect, and verify with allergen swabs or ATP testing. Schedule nut-free products first, before the nut line, to remove the risk at source.
- Separate where possible. Dedicate utensils, trays and storage to nut-free runs.
- Label honestly. If the controls are validated and verified, the shortbread can be sold without a nut precautionary label. If controls cannot be validated, the bakery must either use a precautionary statement or decline to describe the product as nut-free.
- Communicate. Train staff to answer customer questions accurately and never to guarantee 'nut-free' without evidence.
Judgement. The customer's question is a trigger for risk assessment, not a labelling shortcut. The bakery should not claim nut-free until it can demonstrate control.
2. Explain how the bakery could verify that its cleaning procedure is effective, and what it should do if verification fails.
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Verification methods.
- Visual inspection after cleaning, including dismantled parts, seals and brushes. This is necessary but not sufficient because protein residues can be invisible.
- Allergen-specific tests. Lateral-flow devices or ELISA swabs detect peanut protein on surfaces. Swab defined areas - for example 10 cm × 10 cm on the mixer, bench and cutter - before and after cleaning.
- ATP testing measures organic residue generally. It is fast and useful for cleaning checks but does not specifically detect allergens, so it should support, not replace, allergen testing.
- Product testing. Send finished shortbread samples to a laboratory for peanut protein analysis, especially in the first runs after introducing the new procedure.
- Record keeping. Log swab sites, results and corrective actions so trends can be seen.
Setting a standard. The bakery should define what counts as 'clean' - for example, no detectable peanut protein above the test's limit of detection on designated surfaces. The test method and its sensitivity should be understood, because a pass at a high detection limit may not protect very sensitive consumers.
If verification fails.
- Stop the line and do not release affected product as nut-free.
- Re-clean and re-test; investigate why cleaning failed (for example, a brush or seal harbouring residue).
- Consider design changes: dedicated equipment, a different schedule, or eliminating the nut line.
- If the risk cannot be controlled, apply a precautionary allergen label or stop making the nut-free claim.
- Record the failure and the corrective action, and review the procedure.
Principle. Verification is evidence, not assumption. A cleaning procedure is only validated once testing shows it removes the allergen consistently.