A food allergy is based on an immune reaction by the body to harmless vegetable or animal proteins (allergens). In Switzerland, 14 ingredients that may cause an allergy or other adverse reactions must be clearly labelled and highlighted on the packaging.
to page Food allergy
Tiny amounts of the food in question are often enough to trigger an allergic reaction.
to page Cross-reactions
It is often the case that someone who has a reaction to tree pollen, animals or latex is also unable to tolerate certain foods due to a cross-reaction.