![]() ![]() ![]() However, it is also possible for older children and adults to develop allergic symptoms, even when tree nuts have. It is most common to develop a nut allergy before the age of 5. When someone has a tree nut allergy their immune system is reacting to the proteins in the nut. Cashew, and possibly pistachio, allergy may be associated with pectin allergy, and the possibility of pectin allergy should be considered in cashew- or pistachio-allergic patients who have unexplained allergic reactions. Tree nut allergy affects 2 of children and 0.5 of adults in the UK. Ingestion, not only inhalation, of pectin can cause hypersensitivity reactions. Review of previous case reports of pectin-induced occupational asthma revealed several patients with allergies to and cross-reactivity with cashew. ![]() This tree grows to a height of about 5 to 14 m, with the canopy as wide as 20 m. However, it is very time-consuming, expensive and generally associated with the risk of developing severe reactions (6). Nature Anacardium occidentale, also referred to as cashew, is a tropical, evergreen, large tree that belongs to the family Anacardiaceae (1). The pectin in the smoothie was confirmed to be of citrus origin. Oral food challenge (especially double-blind placebo-controlled food challenge test) may be considered as a gold standard for diagnosing allergy related to cashew nut. Results of allergy tests for the other potential food allergens were negative. He had a low-level positive RAST reaction to grapefruit. The child had a positive skin prick test reaction to pectin and a high RAST reaction to cashew and pistachio. Skin tests or radioallergosorbent tests (RASTs) were performed to pectin and other suspected food allergens. To describe a child with pectin-induced food anaphylaxis and to discuss its possible relationship to cashew allergy.Ī 3 1/2-year-old boy developed anaphylaxis once after eating cashews and later after eating a pectin-containing fruit "smoothie." He also has a history of generalized pruritus after eating grapefruit. However, allergic reactions to orally ingested pectin have not been reported. Inhalation of pectin has been identified as a cause of occupational asthma. ![]()
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