tailieunhanh - Food Hypersensitivity

Food hypersensitivity refers to all types of overreactions that an organism can have against a food component. Food sensitivity includes food allergy and food intolerance. Food allergy is a specific form of food hypersensitivity that activates the immune system, leading to an exaggerated response. An immunological reaction is a reaction against foreign substances entering the body. An allergen (nearly always a protein in the offending food) sets off a chain of reactions in the immune system including the release of antibodies. These antibodies trigger the release of body chemicals, such as histamine, which give rise to various symptoms such as. | Food Hypersensitivity Food Hypersensitivity Allergy and Intolerance Food hypersensitivity refers to all types of overreactions that an organism can have against a food component. Food sensitivity includes food allergy and food intolerance. Food allergy is a specific form of food hypersensitivity that activates the immune system leading to an exaggerated response. An immunological reaction is a reaction against foreign substances entering the body. An allergen nearly always a protein in the offending food sets off a chain of reactions in the immune system including the release of antibodies. These antibodies trigger the release of body chemicals such as histamine which give rise to various symptoms such as itchy skin a runny nose coughing or wheezing. Common food allergens are cow s milk soy eggs fruits peanuts treenuts such as hazelnuts seafood and most recently allergies to products that have not been traditionally used in Europe such as kiwi or mango. Already a small amount of food proteins can trigger an allergic reaction. The immune system protects our body from harmful foreign proteins . antigens by generating a response to eliminate them. In a true allergic reaction the immune system produces antibodies. An antibody is a protein that specifically binds with an antigen to inactivate it and remove it from the body. The class of antibodies known as immunoglobulin E Ig E reacts with the antigen and this in turn triggers a reaction with the mast cells tissue cells and basophiles a type of blood cell . Mast cells are found below the surface of the skin and in the membranes lining the nose respiratory tract eyes and intestine. A substance called histamine or other substances such as leukotrienes and prostaglandins are released from mast cells and they cause allergic responses. These adverse reactions are immediate and usually localised. Fortunately most allergic reactions to food are relatively mild but a small number of people have a very severe and .