Food allergies are high on the scale of autoimmune diseases representation, especialy in the well developed countries. In most cases, the disease is genetic. It is created by stimulation of outter and inner factors. Inner factors are genetic and they can't be affected upon, but outter factors are exposure to the allergen, amount of stress, diet etc. which can be controlled. After food input, checking of the affect of its proteins begins. In case the protein doesn't cause an allegry, cascade of imune tolerance begins, but if it does come to any kind of reaction, cascade of antiinflamatory responses begins encouraged by activity histamines. Because of inability to treat this condition, the only possibility is treatment with antihistamines, which are inhibitors of activity of histamines that reduce inflamatory response. With reactions of bigger scales and anaphylactic shock, medical help is needed. At the moment of allergic reaction, the antigen, allergen and specific antibody immunoglobulin bind together. Depending on the type of reaction, participants can be IgE, IgG, IgA, IgM or IgD antibodies. T cells bind to the allergen, and with the help of immune cells they travel to lymph node where cascade of reactions of the defence sistem begins.