Food labelling laws state that food companies must always declare the presence of 14 major allergens when they appear in pre-packed food, and these must be highlighted in the ingredients list (for example, in bold type). People with food allergies must read the ingredient list every time they buy a product, even if they have bought it before. Recipes sometimes change.
Warning labels stating that a product “may contain” a particular allergen, such as nuts, are infuriating because they limit choice and make shopping complicated. But often these warnings are there for a reason because of the risks of cross-contamination during the production chain. Don’t ignore these warnings. You may eat a product numerous times without having a reaction, but the next time you may not be so lucky. Cross-contamination can be intermittent.