5.1 The Big Nine Allergens and Symptoms

The Big Nine is a legal list, not a kitchen rumor

A major food allergen is not “whatever made a guest sick last year.” It is a defined category under federal labeling law and the FDA Food Code 2022. As of January 1, 2023, the official list is the Big Nine: milk, egg, fish, Crustacean shellfish, tree nuts, wheat, peanuts, soybeans, and sesame. That date is not decoration. The Food Allergy Safety, Treatment, Education, and Research (FASTER) Act added sesame as the ninth major food allergen. Packaged foods labeled on or after 2023-01-01 must declare it. Older packaged inventory produced before that date can still sit on a retail shelf or in a restaurant storeroom without sesame on the label. A Person in Charge who only reads a 2022 carton is guessing.

FDA Food Code §2-102.11 includes identifying major food allergens and the symptoms they can cause among the PIC knowledge areas. This is not a hospitality extra. An inspector can ask you to name the nine, to distinguish fish from Crustacean shellfish, and to describe what an allergic reaction looks like. A manager who recites “nuts and dairy” and stops has not demonstrated knowledge.

Spell the nine the way the law spells them

The exam punishes casual kitchen language. Fish means finfish — bass, flounder, cod, salmon, tuna, and other vertebrate seafood. Crustacean shellfish means crab, lobster, and shrimp (and related crustaceans). Molluscan shellfish — oysters, clams, mussels, and scallops — can cause allergies, and they are a separate Food Code world for raw service and Vibrio. They are not a major-allergen category in the Big Nine. If an item asks which food is a major food allergen, “scallops” is the trap. “Shrimp” is the listed crustacean.

Tree nuts and peanuts are two different major allergens. Tree nuts include almonds, walnuts, pecans, cashews, pistachios, hazelnuts, and similar tree-grown nuts. Peanuts are legumes that grow underground. A “nut-free” ticket that still uses peanut sauce has not solved the peanut allergen. A peanut-free ticket that still uses almond pesto has not solved tree nuts. Treat them as separate recipes, separate utensils, and separate storage.

Wheat is the major allergen on the list, not the word gluten. Gluten also appears in barley and rye, which are not Big Nine entries. A guest with celiac disease is reacting to gluten more broadly. A wheat-allergic guest is reacting to wheat proteins. Both need you to stop guessing and read the ingredient list. Do not tell a wheat-allergic guest that a rye roll is automatically safe, and do not tell a celiac guest that “wheat-free” is the same as gluten-free.

Milk is the major allergen. Lactose intolerance is not an allergy. Lactose intolerance is a digestive enzyme problem — uncomfortable, real, and not an immune-system emergency. A milk allergy is an immune response to milk protein. Casein and whey still count. A “lactose-free” dairy product can still contain milk protein and can still trigger a milk-allergic guest. Never substitute a lactose-intolerance story for allergen control.

Hidden ingredients are how kitchens fail the nine

Guests do not order “casein.” They order ranch, pesto, a soy-glazed salmon, or a sesame bun. The PIC job is to know where the nine hide.

Read the table the way an inspector will test it. Caesar dressing is a double trap: egg and often anchovy (fish). Pesto is a tree-nut trap. Tahini is sesame. Tamari is a soy trap and sometimes a wheat trap. Casein and whey are milk even when the menu says “non-dairy.” Albumin is egg. A cook who only looks for a glass of milk or a whole peanut will miss the nine in the mise.

An allergic reaction is not a foodborne infection

An allergic reaction is an immune response. It is not a foodborne infection and it is not a dose-dependent “you just ate a little bad shrimp” story. Tiny amounts — a smear of peanut on a knife, steam from a fish sauté, fryer oil that previously cooked breaded shrimp — can trigger a sensitive guest. The clock can be minutes. Allergen control is a residue problem, not a cooking-temperature problem. Cooking does not reliably “kill” an allergen the way it can kill vegetative bacteria.

Teach the staff the symptom list the Food Code expects a PIC to know:

• Hives — raised, itchy welts
• Swelling of lips, face, tongue, or throat
• Vomiting
• Diarrhea
• Difficulty breathing, wheezing, tightness in the chest
• Anaphylaxis — a rapid, multi-system, life-threatening reaction that can include a drop in blood pressure, loss of consciousness, and airway closure

Not every reaction looks like a textbook anaphylaxis drill. Some guests start with hives and a tingling mouth. Some start with vomiting that a server mistakes for ordinary foodborne illness. The managerial point is the same: stop service of the suspected food, treat breathing or consciousness changes as a medical emergency, and do not argue about how little allergen was in the dish.

How this shows up on the exam

Expect items that swap look-alike categories. Mollusks are not the ninth allergen. Sesame is. Peanuts are not tree nuts. Lactose intolerance is not a milk allergy. Celiac disease is not identical to a wheat allergy, even though wheat is the Big Nine entry. “A little bit should be fine” is never the correct control. Identifying the nine and naming symptoms is §2-102.11 PIC knowledge, not optional training.

Scenario: a guest asks whether the seafood linguine is “nut-free.” The dish has no walnuts. It does have a cream sauce (milk), egg in the pasta, wheat in the noodles, and possibly anchovy in the sauce (fish). A PIC who answers only the nut question has not identified major food allergens. Check the recipe, name every Big Nine ingredient that is actually in the dish, and let the guest decide.

If you remember one sentence from this section, remember this: the Big Nine are a federal list with a 2023 sesame addition, mollusks are not on that list, tiny amounts can trigger an immune reaction, and the PIC has to know both the names and the symptoms.