Food allergy is a disease suffered by millions of people in Europe alone. It is more common in children (around 5-8 %) than it is in the adults (1-3 %). For the past couple of decades food allergy has become more common in the new-borns and children of the preschool age. Experts claim that the nutrition of the mother during the pregnancy is extremely important in prevention of food allergy. Therefore, it is quite important that the nutrition is versatile and equally balanced, but also that the mother does not cut out on the common allergens during the pregnancy (such as peanuts and clams; unless of course the mother herself is allergic to them). Most common allergic reactions are caused by eggs, milk, fish, peanuts, soy, clams, fruit and gluten flakes. Although there are some known risk factors, what causes food allergies still remains unknown. Risk factors can be hereditary predispositions, being exposed to allergens, contemporary lifestyle and polluted environment. Multiple variables are involved in diagnosing allergic diseases such as anamnesis (tracking down symptoms, habits, family history of illnesses etc), skin tests (prick-test and patch-test, measuring specific IgE-antibodies and provocation tests. The main problem is serologic tests that test up to ten nutritive allergens at the same time, which can sometimes make them false positive. After establishing allergic disease in children, the healing treatment begins. One of the methods is elimination diet that completely excludes a certain consumable from nutrition which can severely impact the health and have a long-term negative influence on child’s growth and development. For that reason, elimination diet is introduced only after the diagnosis had been established and along with the regular expert supervision. For individuals that are a part of the higher risk population regarding allergy diseases there are specific types of prevention; breastfeeding from four to six months, avoiding allergens and early immunotherapy. However, so far these measures have not provided us almost any satisfying results.