Food allergy prevention sign in Foods. The food allergy is an exaggerated immune response in the body when in contact with the food allergen. These substances can cause allergic reaction are called allergens or allergens. In its milder forms may be transient in nature (subside with time) can cause cutaneous (from eczema through urticaria atopic dermatitis), gastrointestinal tables (eg, chronic diarrhea), nonspecific gastrointestinal discomfort, nausea, vomiting, difficulty swallowing (eosinophilic esophagitis) and in severe cases anaphylactic shock with death risk. Do not confuse food allergy with food intolerance, which is the inability to eat certain foods or nutrients without adverse effects on health. The effects may be more or less rapid on health.Food intolerance differs from allergies in the latter causing an immune response, activating the immunoglobulin E (IgE) or other immune mechanisms, and intolerance in general be enzyme deficiency that prevents proper metabolism of nutrients . There are common among the pollen proteins that cause rhinitis or asthma, and many plant foods. Many allergic to pollens become allergic to some of these proteins and then begin to have problems with many plant foods. For example, LTP (lipid Transporting protein) are in the skin of peach and the pipe and are also in many fruits and vegetables more, so that those who are allergic to LTP, begin to have problems with allergies to nuts (pipe fruit) and many other fruits and vegetables.Another is the profilins, structural protein of fruits and vegetables, which are usually more mild reactions that LTP but with plenty of fruits and vegetables, other is the syndrome latex / fruit, many are allergic to latex (gloves, condoms, balloons …. ) are allergic to nuts and tropical fruits, tomatoes, etc.., we have the Sazae syndrome (syndrome mugwort, carrot, celery and spices) that are allergic to ragweed pollen allergy start having these foods, etc., etc. .