Question

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which type of immune hypersensitivity is associated with food allergies?
type iii (immune complex - mdiated hypersensitivity)
type i (ige - mediated hypersensitivity)
type ii (igg - mediated cytotoxic hypersensitivity)
type iv (cell - mediated hypersensitivity)

Explanation:

Food allergies are a rapid - onset immune response. Type I hypersensitivity is characterized by IgE - mediated reactions. When a person with a food allergy is exposed to the allergen (e.g., peanut protein), IgE antibodies are produced. These IgE antibodies bind to mast cells and basophils. On subsequent exposure, the allergen cross - links the IgE on these cells, causing degranulation and release of histamine and other mediators, leading to symptoms like itching, swelling, and in severe cases, anaphylaxis. Type III involves immune complex deposition (e.g., in serum sickness), Type II is IgG - mediated cytotoxicity (e.g., hemolytic disease of the newborn), and Type IV is cell - mediated (e.g., contact dermatitis).

Answer:

Type I (IgE - mediated hypersensitivity)