what was chef michael allergic to

The cause of Chef Michael Chiarellos deadly allergic reaction is unknown. However, he was known to have a food allergy that caused him to enter anaphylactic shock. The article does not mention what specific food he was allergic to. Most commonly, food allergies are caused by crustacean shellfish, peanuts, tree nuts, fish, eggs, milk, wheat, soy, and sesame. Nonetheless, any food can cause an allergic reaction, and some foods may contain "hidden" allergens that may not appear on restaurant menus.