What is a Hazelnut Allergy?
A hazelnut allergy is an immune system reaction to specific proteins in hazelnuts. The body mistakenly identifies these proteins as harmful, triggering an allergic response. Most hazelnut allergies are IgE-mediated, leading to rapid symptoms after exposure. Rarely, non-IgE-mediated reactions may occur, which usually involve delayed gastrointestinal symptoms.
Hazelnuts as a Tree Nut in Australia
Hazelnuts are legally classified as a tree nut under the FSANZ (Food Standards Australia New Zealand) allergen labelling laws. They are among the top allergens required by law to be declared on food packaging. Hazelnuts are commonly found in chocolates, baked goods, spreads, and desserts across Australia.
How Common is Hazelnut Allergy in Australia?
Hazelnut allergy is part of the broader tree nut allergy group, affecting both children and adults. According to Allergy & Anaphylaxis Australia, tree nut allergies, including hazelnut, have been increasing in prevalence. Hazelnut allergy is one of the most frequently reported tree nut allergies in Australia.
Hazelnut Allergy Symptoms
Hazelnut allergy symptoms can vary in severity and timing depending on the level of exposure.
Mild to moderate symptoms
Common mild to moderate symptoms include:
- Hives or skin rashes
- Itching around the mouth or throat
- Stomach pain, nausea, or vomiting
- Sneezing or mild wheezing
- Runny nose or watery eyes
Severe allergic reactions and anaphylaxis
In some cases, hazelnut allergy can cause anaphylaxis, a life-threatening reaction. Symptoms include:
- Difficulty breathing
- Swelling of the tongue or throat
- Rapid drop in blood pressure
- Dizziness or loss of consciousness
Immediate use of an adrenaline autoinjector (EpiPen®) and calling 000 is critical during anaphylaxis.
Diagnosis and Testing for Hazelnut Allergy
GP and allergy specialist pathway
If you suspect a hazelnut allergy, visit your GP, who can provide a Medicare-covered referral to an allergy specialist. Specialists assess your history and arrange appropriate testing.
Skin prick and blood tests
- Skin prick tests expose your skin to hazelnut extract to look for a reaction.
- RAST/IgE blood tests check for specific antibodies in your blood.
Both tests may produce false positives, so results are interpreted alongside your medical history.
Oral food challenge
The oral food challenge is the gold standard for diagnosis. It involves supervised consumption of small amounts of hazelnut under medical observation to confirm the allergy.
Foods and Products That May Contain Hazelnuts
Packaged and processed foods
Hazelnuts may be found in:
- Chocolate spreads (e.g. Nutella)
- Pralines and nougat
- Cakes, biscuits, and pastries
- Muesli and granola bars
Personal care and cosmetic products
Some lotions, shampoos, and lip balms contain hazelnut oil or extracts. Always check labels carefully.
Cross-contamination and “may contain” labels
Manufacturing processes can lead to cross-contact with hazelnuts. Watch for “may contain traces of tree nuts” warnings on packaging.
Hazelnut Cross-Reactivity with Other Allergens
Tree nuts and cross-sensitisation
People allergic to hazelnuts may react to other tree nuts (e.g. almonds, walnuts) due to shared protein structures.
Pollen-related cross-reactivity
Hazelnut allergy is sometimes linked to birch pollen allergy. This can cause oral allergy syndrome (OAS) — itching or swelling in the mouth after eating raw hazelnuts.
Living with Hazelnut Allergy in Australia
Reading food labels and ingredient lists
FSANZ mandates clear allergen labelling. Look for tree nut declarations and understand ingredient lists before purchasing.
Dining out safely with an allergy
When eating out:
- Notify staff of your allergy.
- Use an allergy alert card.
- Ask about food preparation and cross-contact procedures.
Managing workplace exposure risks
Workplaces can pose risks through shared snacks or meals. It’s vital to:
- Inform colleagues and supervisors.
- Ensure shared spaces follow safe food handling practices.
- Keep your EpiPen® accessible at all times.
Treatment and Emergency Management
Use of antihistamines and adrenaline (EpiPen®)
Mild symptoms may respond to antihistamines. Severe reactions require immediate adrenaline injection and emergency assistance.
Anaphylaxis Action Plans
Your doctor can provide an Anaphylaxis Action Plan, detailing steps to take during an emergency. Ensure those around you know how to assist.
Immunotherapy and future treatments
Oral immunotherapy (desensitisation) for hazelnut allergy is under investigation and may become available in the future.
Support and Resources in Australia
Allergy & Anaphylaxis Australia
This organisation provides education, advocacy, and membership benefits, including alerts on food recalls.
School and childcare policies
Australian schools and childcare centres often have nut-free policies and emergency management plans for children with allergies. Child protection training, often mandatory for personnel working with children, also covers basic allergy information to keep children safe.
Emergency medical services and response times
In an emergency, dial 000 immediately. Response times vary between urban and rural areas, so early action is critical.
FAQ
Is hazelnut considered a tree nut in Australia?
Yes. Hazelnut is classified as a tree nut under Australian food allergen laws.
Can I be allergic to hazelnuts but not other nuts?
Yes. Some people react only to hazelnuts, although cross-reactivity is common.
What foods should I avoid if I have a hazelnut allergy?
Avoid products containing hazelnuts or that may have cross-contact — e.g. chocolates, spreads, and baked goods.
Are hazelnut allergies common in adults?
Yes. While often diagnosed in childhood, hazelnut allergy can develop in adults.
What are signs of a hazelnut allergic reaction?
Itching, swelling, rashes, stomach pain, or breathing difficulties.
Is there a cure for hazelnut allergy?
No cure exists, but strict avoidance and emergency management are effective.
Can I touch hazelnuts if I’m allergic?
Some people react to skin contact. Avoid touching hazelnuts and wash hands after exposure.
How is hazelnut allergy diagnosed?
Through skin prick tests, blood tests, and oral food challenges under specialist care.
Is Nutella safe for people with nut allergies?
No. Nutella contains hazelnuts and is unsafe for those with hazelnut allergy.
What should I do if I have an allergic reaction at work?
Use your EpiPen® immediately and call 000. Notify a coworker and follow your action plan.
Key Points
- Hazelnuts are classified as tree nuts and are a common allergen in Australia.
- Symptoms vary from mild itching to life-threatening anaphylaxis.
- Diagnosis includes skin prick, IgE blood tests, and oral food challenges.
- Hazelnuts appear in many foods and personal care products.
- FSANZ allergen labelling helps reduce risk.
- EpiPens and action plans are essential for safety.
- Cross-reactivity with birch pollen and other tree nuts should be considered.
