Foods to Avoid for Allergies: 9 Major Allergens

Milk, eggs, and peanuts are among the 9 major food allergens to avoid if you are allergic to them, not foods everyone with allergies needs to avoid.

The AI symptom analyzer may help you organize symptoms, but it cannot diagnose an allergy or assess an emergency. For hydration rather than food-allergy treatment, see the best drinks for allergies.

Which 9 foods should you avoid if you have allergies?

The United States recognizes these 9 foods or food groups as major allergens. They account for many food-allergy reactions, but other foods can cause allergies too.

Avoid a food if you have a confirmed allergy to it, following your clinician’s instructions. If you suspect a food caused a reaction, avoid that food until you can discuss it with a clinician; you do not need to remove the entire list from your diet.

1. Milk

A milk allergy occurs when the immune system reacts to milk proteins, such as casein or whey. It is different from lactose intolerance, which involves difficulty digesting milk sugar.

If you have a milk allergy, check for milk in foods such as cheese, butter, baked goods, and sauces. Lactose-free milk still contains milk proteins and is not a substitute for someone with a milk allergy. Do not try baked milk as a way to test your allergy unless your allergist has given you a specific plan.

Evidence: A 2021 review of cow’s milk allergy describes elimination diets as part of managing confirmed allergy and discusses medically supervised food challenges and immunotherapy. It does not show that avoiding milk helps people with unrelated allergies.

2. Eggs

An egg allergy is an immune reaction to egg proteins, which can occur in both the white and the yolk. Eggs may appear in baked goods, mayonnaise, pasta, and foods with an egg wash.

If you have a confirmed egg allergy, check ingredient labels and ask how prepared foods are made. Some people tolerate egg in certain baked foods, but you should discuss this with an allergist rather than testing it yourself.

Evidence: Egg is a recognized major food allergen, so avoiding it is appropriate when your clinician recommends it for a confirmed allergy. Avoiding eggs is not a general treatment for pollen or other unrelated allergies.

3. Peanuts

Peanut allergy involves an immune response to peanut proteins; even a small exposure can cause a serious reaction in some people. Peanuts may be present in nut butters, sweets, sauces, and foods made on shared equipment.

If you are allergic, read labels and ask restaurants about ingredients and preparation. Discuss peanut oil and the need to avoid particular products with your allergist. Peanuts are legumes, but a peanut allergy does not automatically mean you must avoid every other legume.

Evidence: Peanut is a well-established major food allergen. The case for avoiding it applies to people with peanut allergy, not everyone who has allergies.

4. Tree nuts

Tree nut allergies involve proteins in nuts such as almonds, cashews, walnuts, and pistachios. A person can be allergic to one type, several types, or more, and cross-contact can occur during processing.

Follow your allergist’s advice about which nuts to avoid. Check foods such as nut butters, pesto, baked goods, and desserts, and ask about shared equipment when buying prepared foods.

Evidence: Tree nuts are recognized major food allergens. A tree nut allergy should be assessed individually; the label alone does not establish which other nuts you can safely eat.

5. Fish

Fish allergy is an immune reaction to fish proteins. Fish can appear in less obvious products, including some sauces, broths, and dressings.

If you have a fish allergy, ask which fish and products you need to avoid and check ingredient labels. Restaurant grills and cooking surfaces may also transfer fish proteins to another meal. Fish and shellfish are different groups, so an allergy to one does not automatically mean an allergy to the other.

Evidence: Fish is a recognized major food allergen. Avoidance is relevant to a diagnosed fish allergy, rather than a proven remedy for other allergies.

6. Crustacean shellfish

Crustacean shellfish, including shrimp, crab, and lobster, contain proteins that can cause allergic reactions. Shellfish ingredients may appear in sauces, stocks, seafood dishes, and fried foods prepared in shared oil.

Avoid the shellfish your allergist identifies and ask restaurants about shared preparation areas. Mollusks, such as clams and scallops, can also cause allergies, although crustacean shellfish are the group specifically included among the 9 major U.S. allergens. Ask your allergist whether you need to avoid mollusks too.

Evidence: Crustacean shellfish are recognized major allergens. A reaction to one kind warrants individual assessment rather than assumptions about every seafood.

7. Wheat

Wheat allergy is an immune reaction to wheat proteins. Wheat is common in bread and pasta, but it may also appear in sauces, coatings, and other prepared foods.

If you have a wheat allergy, check labels and follow your clinician’s advice about substitutes. Wheat allergy is different from celiac disease and from non-celiac gluten sensitivity; the right dietary restrictions depend on the diagnosis.

Evidence: Wheat is a recognized major food allergen. Avoiding it is appropriate for a confirmed wheat allergy, but a wheat-free diet is not established as a treatment for unrelated allergies.

8. Soy

Soy allergy involves an immune response to soy proteins. Soy can be found in foods such as tofu, edamame, miso, and some sauces and packaged products.

If you are allergic, read ingredient labels and discuss specific products with your allergist. Do not assume that every product containing a soy-derived ingredient poses the same risk; your clinician can help you understand which products to avoid.

Evidence: Soy is a recognized major food allergen. Avoidance should be based on your own allergy and care plan, not on the assumption that soy worsens allergies in general.

9. Sesame

Sesame allergy is an immune reaction to sesame proteins. Sesame may appear as whole seeds, sesame oil, tahini, or an ingredient in foods such as hummus, dressings, and baked goods.

If you have a sesame allergy, check labels and ask about ingredients in prepared foods. Foods from bakeries or restaurants may also come into contact with sesame during preparation.

Evidence: Sesame is a recognized major U.S. food allergen. Avoiding sesame is appropriate for a confirmed sesame allergy; it is not a general remedy for other allergies.

Which other foods should you limit or check?

There is no universal list of foods that everyone with allergies should limit. In particular, do not remove foods solely because they appear on a major-allergen list. Unnecessary restrictions can make it harder to get a balanced diet.

For a known food allergy, the important question is whether a food contains your allergen or may have come into contact with it:

Some people with pollen allergies react to certain raw fruits or vegetables because their proteins resemble pollen proteins. If a food makes your mouth itch or causes another reaction, discuss it with an allergist instead of assuming you need to avoid all produce.

Who should be careful, and when should you see a doctor?

See a clinician or allergist if you think a food caused a reaction, if you are unsure which foods to avoid, or if your diet has become restricted. Allergy testing and a medical history can help guide the assessment; a supervised food challenge may sometimes be needed. Do not deliberately eat a suspected allergen at home to test whether it is safe.

Children who avoid foods may need nutrition counseling and growth monitoring. A 2024 review of children with food allergies found that dietary restrictions can increase the risk of nutrient deficiencies and poor growth. Parents should discuss suspected reactions and feeding changes with a pediatrician, rather than broadly restricting a child’s diet to prevent allergies.

During pregnancy or breastfeeding, speak with your clinician or a dietitian before making extensive dietary restrictions. Continue to avoid any food for which you have a diagnosed allergy, and ask for help finding suitable substitutes.

Get emergency help immediately for suspected anaphylaxis, including trouble breathing, throat tightness, fainting, or symptoms affecting more than one body system after exposure. Use a prescribed epinephrine auto-injector promptly according to your emergency plan, call local emergency services, and seek emergency care even if symptoms improve.