Gomasio

Cross-reactivity

Case notes

A jar labeled gomasio gives no hint that sesame is the main event. The word is a transliteration, not a description, and it can appear on a label in more than one spelling — gomashio is the same ingredient, and so is the tidier-sounding sesame salt. Any of the three can sit in a seasoning blend, a rice topping, or a packaged snack without the word sesame appearing nearby, which means a quick scan for familiar allergen terms can pass right over it.

The wider problem is that sesame travels under many names. Gomasio sits alongside terms like tahini, benne, halvah, sesamol, and the botanical name Sesamum indicum — all pointing back to the same source. For a parent checking a school snack or a party spread, that means the useful habit is learning the name list rather than looking for one word. Gomasio belongs to the 2S albumins family, the seed storage-protein group associated with seed allergy.

That family is worth knowing by name because it spans more than sesame. Characterized 2S albumins include peanut's Ara h 2, 6 and 7, walnut's Jug r 1, cashew's Ana o 3, and hazelnut's Cor a 14, with moderate structural overlap between several of them — roughly 25 to 50 percent of people allergic to peanut react to tree nuts. Reactions attributed to this family range from contact dermatitis and respiratory symptoms to anaphylaxis in severe cases.