The Big 9 Food Allergens: A Practical Guide for Texas Restaurant Workers

Food allergies affect an estimated 33 million Americans, and for many of them, eating the wrong ingredient is not an inconvenience — it is a medical emergency. As a food handler, understanding allergens and responding correctly to allergy requests is part of your professional and legal responsibility.

What are the Big 9 major food allergens?

The FDA recognizes nine foods responsible for the vast majority of allergic reactions in the United States. These must be disclosed on packaged food labels, and restaurants are expected to communicate their presence in menu items on request.

Milk — includes butter, cream, cheese, yogurt, and whey
Eggs — found in baked goods, sauces, coatings, and pasta
Fish — includes bass, flounder, cod, and others (must be identified by species)
Shellfish — shrimp, crab, lobster, clams (must be identified by species)
Tree nuts — almonds, cashews, walnuts, pecans, pistachios, and others
Peanuts — technically a legume, not a nut, and a common trigger of severe reactions
Wheat — found in flour, bread, pasta, breading, soy sauce, and many processed foods
Soybeans — found in edamame, tofu, miso, and many packaged products
Sesame — added to the FDA list in 2023; found in tahini, hummus, some breads and oils

What is the difference between a food allergy and a food preference?

A food preference — "I don't like onions" — is personal taste. A food allergy involves the immune system and can trigger reactions ranging from hives and swelling to anaphylaxis, a severe and potentially fatal reaction that requires an epinephrine injection and emergency care.

When a customer tells you they have a food allergy, treat it as a medical condition — because it is.

What should a food handler do when a customer flags an allergy?

1. Take it seriously, every time. Do not assume it is a preference or a trend. Ask: "Is this an allergy or a preference?" If they say allergy, the following steps apply.

2. Immediately notify your manager and the kitchen. Most restaurants have allergy protocols — separate prep surfaces, dedicated utensils, or dishes prepared by a specific person. Do not guess or improvise.

3. Never guess about ingredients. "I am not sure — let me check with the kitchen" is always the right answer when you are uncertain. Guessing wrong can send someone to the hospital.

4. Watch for hidden allergens.

Wheat is in soy sauce and many marinades
Peanuts appear in some chili and mole sauces
Dairy hides in some breads and dressings
Sesame oil is used in many Asian-style dishes

Know your menu — or know who to ask.

5. Prevent cross-contact. Even trace amounts of an allergen can trigger a severe reaction. This means:

Washing hands before preparing an allergen-free dish
Using clean, dedicated utensils and prep surfaces
Avoiding shared fryer oil that contacted an allergen

What is the difference between cross-contamination and cross-contact?

In food safety, cross-contamination typically refers to the transfer of bacteria between foods. Cross-contact refers to the transfer of allergen proteins from one food to another. Unlike bacteria, cooking does not destroy allergen proteins — a dish that contacted peanuts is not safe for someone with a peanut allergy, regardless of how hot it was cooked.

Your role as a food handler

You do not need to memorize every ingredient in every dish. Your role is to:

Take every allergy report seriously and never dismiss it
Involve a manager immediately when an allergy is flagged
Never guess about ingredients
Understand the Big 9 so you can recognize when to raise a concern

Handling allergen requests correctly is one of the most direct ways a food handler protects a guest's safety — and one of the most important skills covered in the Texas food handler certification course.

Get Certified and Be Ready for Allergy Situations

Our Texas Food Handler course covers the Big 9 allergens, cross-contact prevention, and every other topic on the final certification exam. Complete it in about 2 hours on any phone or computer.