A food allergy is an immune system reaction that can cause a wide range of symptoms, from mild (such as a rash on the skin of the body) to very dangerous (such as anaphylactic shock). If it is detected, it is recommended to avoid consuming even the smallest amounts of the identified allergen. Meanwhile food intolerance is a difficulty in digesting a certain type of food, which can cause unpleasant sensations (bloating, stomach pain, diarrhoea, nausea) that are not life-threatening.