Food Allergens: Practice Questions & Explanations

The FDA Big 9 (updated from Big 8 with sesame addition in 2023): (1) Milk; (2) Eggs; (3) Fish (e.g., bass, flounder, cod); (4) Crustacean shellfish (e.g., crab, lobster, shrimp); (5) Tree nuts (e.g., almonds, cashews, walnuts); (6) Peanuts; (7) Wheat; (8) Soybeans; (9) Sesame (added by FASTER Act, effective 2023). These nine allergens account for the vast majority of severe food allergic reactions in the US. Food handlers must: know which menu items contain or may contain these allergens; communicate accurately to customers asking about allergens; prevent cross-contact (when a non-allergen food picks up traces of an allergen from contact with shared surfaces, utensils, or fryers). Cross-contact is not solved by cooking — allergen proteins survive cooking temperatures. A peanut-allergic customer can react to fries cooked in oil also used for peanut-coated chicken. Anaphylaxis from food allergens kills people; the food handler's vigilance can be life-or-death.

Cross-contact occurs when allergens accidentally transfer to non-allergen foods. Cooking does NOT destroy food allergens — proteins remain reactive at any temperature. Prevention strategies: (1) Use separate dedicated equipment for allergen-free preparation when possible (separate fryers, grills, cutting boards, utensils); (2) Wash hands thoroughly and change gloves before preparing allergen-free meals; (3) Clean and sanitize all food-contact surfaces and equipment between uses, with attention to crevices and hidden surfaces; (4) Use clean uniforms, aprons, and hair restraints; (5) Read all ingredient labels carefully — allergens may be present in sauces, marinades, breading, etc.; (6) Use color-coded utensils for allergen-free preparation; (7) Communicate clearly with kitchen staff about each allergy-restricted order; (8) Store allergens away from non-allergen foods; (9) Train all staff on allergen procedures. When in doubt, refuse rather than guess — saying 'I'm not sure' is better than serving a potentially deadly food.

PEANUT ALLERGIES can be life-threatening — anaphylaxis from peanut exposure kills people. The food service team's responsibility: SERVER: Record the allergy; communicate to the kitchen clearly; verify the kitchen acknowledges; KITCHEN: Identify all dishes that may contain peanuts (including hidden sources: satay sauce, some Asian cuisines, some desserts, some snack mixes); prepare the order on clean surfaces with clean utensils (peanut protein can survive on surfaces and cannot be destroyed by cooking); CROSS-CONTACT PREVENTION: Even trace amounts of peanut from shared fryer oil, shared utensils, or contaminated surfaces can trigger reactions. The legal and ethical standard is to provide accurate information and take reasonable steps to prevent cross-contact.

FOOD ALLERGEN MANAGEMENT — CROSS-CONTACT PREVENTION: Cooking does NOT destroy allergens (unlike pathogens) — even tiny amounts of an allergen can cause a severe or fatal reaction. PREVENTING CROSS-CONTACT: Use clean, sanitized equipment, utensils, cutting boards, and surfaces; wash hands thoroughly; use separate fryers (allergens transfer through shared oil); prepare allergen-free orders separately; communicate the allergy clearly to the entire kitchen team; check all ingredients including sauces, marinades, and garnishes for hidden allergens; THE BIG 9 ALLERGENS: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soybeans, and sesame (added 2023); SEVERITY: Allergic reactions range from mild to anaphylaxis (life-threatening); a peanut allergy is among the most dangerous; SERVER/HANDLER ROLE: Take allergies seriously, communicate to the kitchen, verify ingredients, prevent cross-contact, and know the emergency response if a reaction occurs.

Major food allergens that food handlers must know include milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame (sesame was added as a recognized major allergen). For a person with a food allergy, even a tiny amount of an allergen can trigger a severe, potentially life-threatening reaction (anaphylaxis). Food handlers must be able to identify which menu items contain allergens, prevent cross-contact (for example, using clean utensils and surfaces), and communicate accurately with guests about ingredients. Taking allergen requests seriously and preventing cross-contact is a key food-safety duty.

Cross-contact occurs when an allergen is unintentionally transferred from a food containing it to a food that is supposed to be free of that allergen — for example, using the same cutting board, utensil, fryer oil, or gloves for both, or letting foods touch. Unlike cross-contamination with pathogens, cross-contact cannot be 'cooked away'; the allergen protein remains and can still trigger a reaction. To prevent cross-contact, food handlers use clean and separate equipment and surfaces, wash hands and change gloves, and prepare allergen-free orders carefully. Understanding cross-contact is essential to safely serving guests with allergies.