Top Food Allergens to be Aware of in Restaurants

Food allergies are becoming increasingly common among Canadian diners, driving demand for allergen transparency among restaurants. Awareness of the most common food allergens and how to prevent cross-contamination can help protect your guests and your business.

Food Allergy Canada says more than 3 million Canadians are affected by food allergies. For restaurants, allergen awareness and communication are more critical than ever. Even a trace amount of an allergen can trigger a severe reaction, making clear labeling, proper training, and safe food-handling practices essential. When restaurant staff are unsure about ingredients or fail to communicate effectively, it can lead to life-threatening mistakes.

The Most Common Food Allergens in Restaurants

Below are the top food allergens that restaurant staff should recognize and manage daily.

1. Peanuts

• Common sources: Peanut butter, sauces, desserts, salad dressings.
• Hidden risks: Peanut oil in deep fryers, shared utensils, and desserts handled near nut products.

2. Tree Nuts (Almonds, Cashews, Walnuts, etc.)

• Common sources: Pesto, baked goods, nut milks, and granola.
• Hidden risks: Cross-contact from cutting boards, blenders, or shared storage bins.

3. Milk

• Common sources: Butter, cheese, cream sauces, baked goods.
• Hidden risks: Residue on griddles, shared utensils, or mislabeled “non-dairy” items that still contain casein or whey.

4. Eggs

• Common sources: Sauces like hollandaise, batters, mayonnaise, and baked goods.
• Hidden risks: Shared bowls or mixers, and “egg wash” contamination on baked goods.

5. Fish

• Common sources: Sauces, dressings, or soups made with fish stock.
• Hidden risks: Shared fryers or prep surfaces that contact fish before cooking other proteins.

6. Shellfish (Crustaceans and Mollusks)

• Common sources: Shrimp, crab, lobster, oysters, sauces, soups.
• Hidden risks: Steam and splatter in kitchens, shared grills, or cooking water.

7. Soy

• Common sources: Soy sauce, tofu, marinades, and vegetarian alternatives.
• Hidden risks: Soy lecithin in desserts, sauces, or baked goods; shared cooking oil.

8. Wheat / Gluten

• Common sources: Bread, pasta, batter, soy sauce, and soups.
• Hidden risks: Shared toasters, cutting boards, or flour dust contaminating other foods.

9. Sesame

• Common sources: Bread toppings, hummus, sauces, oils.
• Hidden risks: Tiny seeds can easily spread during prep or plating, contaminating non-allergen dishes.

10. Mustard

• Common sources: Condiments, marinades, salad dressings, spice blends.
• Hidden risks: Residue on utensils or surfaces, especially during sandwich prep.

Cross-Contamination

Cross-contact can happen quickly, through shared fryers, cutting boards, utensils, or unwashed hands. Communication breakdowns during busy service can worsen things, especially if menus are mislabeled or incomplete.

To reduce the risk:

• Use separate prep areas and tools for allergen-free orders.
• Label all ingredients and storage containers clearly.
• Maintain clean and sanitized work surfaces.
• Train staff to verify ingredients before serving.

The Importance of Staff Training and Communication

Every team member, from cooks and servers to hosts and managers, should understand how allergens are handled in your establishment. Establishing food prep, storage, and cleaning protocols can drastically reduce the risk of cross-contact. Just as importantly, clear communication between the kitchen and front-of-house staff ensures that allergen requests are correctly understood and executed. Allergen management should also be documented in a restaurant’s food safety plan.