Peach and Apple Allergies: The Lipid Transfer Protein (LTP) Syndrome
Published: 30 March 2026
If you've ever experienced an unexpected reaction after eating a peach, apple, or other plant-based food, Lipid Transfer Protein syndrome — commonly known as LTP syndrome — may be a relevant consideration. Unlike the more widely recognised oral allergy syndrome, LTP-related reactions can sometimes be more significant and are increasingly identified across the UK, including in London's diverse population.
Understanding LTP allergy is an important step towards making informed decisions about your health and wellbeing. In this guide, we explore what LTP syndrome involves, how it may present, what testing options are available, and when it may be appropriate to seek medical advice.
What Is Lipid Transfer Protein (LTP) Syndrome?
Lipid Transfer Protein syndrome is a food allergy caused by sensitisation to non-specific lipid transfer proteins (nsLTPs), a family of heat-stable, digestion-resistant proteins found widely in plant foods, including fruits, vegetables, nuts, seeds, and cereals. Unlike some plant proteins that break down with cooking, LTPs can remain intact after heating, which may explain why reactions can occur with both raw and cooked foods.
The most commonly identified LTP allergen is Pru p 3, found in peach skin. Because LTPs share similar structures across many plant species, individuals sensitised to one LTP may also react to proteins in other foods — a phenomenon known as cross-reactivity.
Practical Insight: LTP syndrome differs from oral allergy syndrome (OAS) in that reactions may not be limited to the mouth and can sometimes involve more systemic responses. If you experience reactions to cooked or processed fruit, LTP sensitisation may be worth exploring through appropriate testing.
How Does LTP Syndrome Differ from Oral Allergy Syndrome?
Many people confuse LTP allergy with oral allergy syndrome, as both can involve reactions to fruits. However, these conditions have distinct characteristics that may influence how they are assessed.
| Feature | LTP Syndrome | Oral Allergy Syndrome (OAS) |
|---|---|---|
| Primary allergen | Non-specific lipid transfer proteins (e.g., Pru p 3) | PR-10 proteins (e.g., Bet v 1 homologues) |
| Trigger foods | Peach, apple, cherry, walnut, hazelnut, lettuce, tomato, cereals | Apple, cherry, pear, carrot, celery |
| Heat stability | LTPs are heat-stable — reactions may occur with cooked foods | PR-10 proteins are heat-labile — cooking often reduces reactivity |
| Typical symptoms | May range from localised to systemic reactions | Usually limited to oral/throat tingling and itching |
| Pollen association | Mugwort, plane tree pollen | Birch pollen (most common in UK) |
| Geographic prevalence | More commonly reported in Mediterranean regions, though increasingly identified in the UK | Common throughout Northern Europe, including the UK |
| Severity potential | Can sometimes involve more significant reactions | Generally considered milder |
Practical Insight: If you find that cooking fruit does not reduce your symptoms, this pattern can sometimes suggest LTP sensitisation rather than OAS. A food allergy blood test may help clarify which protein components are involved.
Which Foods Are Associated with LTP Allergy?
LTPs are widely distributed throughout the plant kingdom. Because these proteins share structural similarities, sensitisation to one LTP source may sometimes be associated with reactivity to others.
Foods that commonly contain relevant LTPs include:
- Rosaceae fruits: Peach (particularly the skin), apple, cherry, plum, apricot, strawberry
- Tree nuts: Walnut, hazelnut, almond
- Vegetables: Tomato, lettuce, asparagus, cabbage
- Cereals and grains: Wheat, maize, rice
- Legumes: Peanut, lentil, chickpea, soybean
- Seeds: Sunflower seed, mustard seed
- Other: Grape, citrus fruits, beer, wine
The peach is widely regarded as the primary sensitising food for LTP syndrome, with Pru p 3 being the most clinically significant marker. Notably, LTP concentration tends to be higher in the skin of fruits than in the flesh, which is why some individuals may tolerate peeled fruit more comfortably.
Practical Insight: Reactions may not always be consistent. Some individuals with LTP sensitisation report that co-factors such as exercise, alcohol consumption, or non-steroidal anti-inflammatory medication taken around the time of eating can sometimes influence the likelihood or intensity of a response. This variability can make identification more challenging without appropriate testing.
Recognising Potential Symptoms of LTP Syndrome
Symptoms associated with LTP allergy can vary considerably between individuals. They may include:
- Oral symptoms: Tingling, itching, or swelling of the lips, tongue, or throat — overlapping in some cases with inflammatory oral conditions such as geographic tongue
- Skin reactions: Hives (urticaria), flushing, or generalised itching
- Gastrointestinal symptoms: Nausea, abdominal discomfort, or vomiting
- Respiratory symptoms: Nasal congestion, wheezing, or shortness of breath
- Systemic reactions: In some cases, more significant reactions involving multiple body systems
It is important to note that not everyone with LTP sensitisation will experience symptoms, and the severity can vary. If you experience any concerning symptoms — particularly those affecting breathing or circulation — seek urgent medical care immediately.
Practical Insight: Keeping a food and symptom diary may help identify patterns that can be discussed with an appropriate healthcare professional. This information can also be valuable when considering whether allergy testing may be beneficial.
Who Should Consider LTP Allergy Testing?
Allergy blood testing can be a helpful step for individuals who wish to understand whether LTP sensitisation may be relevant to their symptoms. You may wish to consider testing if you:
- Experience reactions to multiple plant-based foods, particularly peach or apple
- Notice symptoms with both raw and cooked fruit or vegetables
- Have reactions that seem inconsistent or unpredictable
- Experience symptoms that extend beyond mild oral tingling
- Have a history of pollen allergy (particularly mugwort or plane tree) alongside food reactions
- Live or work in London and are exposed to high plane tree pollen levels during spring and summer months
Component-resolved diagnostics (CRD) can identify specific protein sensitisations — such as Pru p 3 — rather than simply confirming reactivity to a whole food extract. This molecular-level approach may provide more detailed information about cross-reactivity patterns.
Our clinic offers allergy testing services that can assess specific IgE levels to individual allergen components, providing a clearer picture that you can discuss with your healthcare provider.
Understanding Your Test Results
Allergy blood tests measure specific IgE antibodies in the blood. Results can sometimes indicate sensitisation to particular allergen components, though it is important to understand that:
- A positive result (elevated specific IgE) suggests sensitisation but does not automatically confirm clinical allergy — some individuals may be sensitised without experiencing symptoms
- A negative result makes IgE-mediated allergy to that component less likely but may not completely exclude it
- Component-specific testing (e.g., Pru p 3 for peach LTP) can sometimes provide more clinically useful information than whole-extract testing
- Results should ideally be interpreted alongside your clinical history by an appropriate healthcare professional
Practical Insight: Test results form one part of a broader assessment. We provide clear, detailed reports that can be shared with your GP or allergy specialist to support informed clinical decisions.
How Often Should Allergy Testing Be Repeated?
The frequency of retesting may depend on individual circumstances. General considerations include:
- Initial baseline testing when symptoms first raise concerns
- Follow-up testing may be considered after 12–24 months, particularly if symptoms change or new food reactions develop
- Children and young people may benefit from periodic reassessment, as sensitisation patterns can evolve during growth and development
- After significant dietary changes, retesting may help provide updated information
Your healthcare provider can advise on the most appropriate testing schedule based on your individual circumstances. For more information about the blood tests we offer, our team can help guide you through the options available.
LTP Syndrome and Living in London
London presents some unique considerations for individuals with LTP sensitisation. The city's extensive planting of London plane trees — one of the most common street trees in the capital — means that exposure to plane tree pollen is a regular seasonal occurrence. Plane tree pollen contains LTP allergens that share structural similarities with food-based LTPs, and this cross-reactivity may sometimes be relevant.
Additionally, London's richly diverse food culture means exposure to a wide range of plant-based foods — from Mediterranean cuisine to Asian cooking — is common. For individuals with LTP sensitisation, this variety can sometimes present challenges when trying to identify trigger foods.
Private allergy screening in London offers an accessible route to gaining clarity. Unlike NHS pathways, which may involve longer waiting times for specialist allergy services, private testing can often provide timely results that support more prompt discussions with your healthcare team.
Practical Insight: If you live in London and notice seasonal patterns in your food reactions — particularly worsening during late spring when plane trees are pollinating — this may be a relevant detail to mention when considering allergy testing.
Frequently Asked Questions About LTP Syndrome
What is Lipid Transfer Protein syndrome?
Lipid Transfer Protein syndrome is an IgE-mediated food allergy caused by sensitisation to non-specific lipid transfer proteins found in a wide range of plant foods. The primary sensitising allergen is Pru p 3, found in peach skin. Unlike some food allergies, LTP syndrome can sometimes involve reactions to cooked as well as raw foods, because LTPs are heat-stable proteins that may resist breakdown during food preparation and digestion.
Can you be allergic to peach but not apple?
Yes, this is possible. Although LTPs share structural similarities across different plant species, the degree of cross-reactivity can vary between individuals. Some people may react primarily to peach — which contains higher concentrations of LTP, particularly in the skin — while tolerating apple or other fruits. Component-specific allergy blood testing can sometimes help clarify individual sensitisation patterns.
Is LTP allergy the same as oral allergy syndrome?
No, these are distinct conditions, though both can involve reactions to fruits. Oral allergy syndrome is typically linked to birch pollen cross-reactivity and involves heat-labile PR-10 proteins, meaning cooking usually reduces symptoms. LTP syndrome involves heat-stable proteins, so reactions may occur with cooked foods. LTP reactions can also sometimes be more significant than the typically mild symptoms associated with oral allergy syndrome.
What foods should I be aware of if I have LTP sensitisation?
LTPs are found in many plant foods, including peach, apple, cherry, walnut, hazelnut, peanut, tomato, lettuce, wheat, and grapes. However, sensitisation does not necessarily mean you will react to all LTP-containing foods. A detailed clinical assessment, supported by component-resolved testing, can help provide a more personalised understanding. It is important to seek medical advice before making significant dietary changes.
Can LTP allergy develop in adulthood?
Yes, LTP sensitisation can develop at any age, including adulthood. Some individuals may notice the onset of reactions to previously tolerated foods. If you experience new or unexplained symptoms after eating plant-based foods, it may be worth discussing allergy testing with your healthcare provider to explore whether LTP sensitisation could be a contributing factor.
Does cooking destroy LTP allergens?
Unlike many other plant allergens, LTPs are notably resistant to heat and digestive enzymes. This means that cooking, baking, or processing foods may not significantly reduce LTP allergenicity. This heat stability is one of the distinguishing features of LTP allergy and may explain why some individuals react to foods such as cooked tomato sauce, baked goods containing nuts, or pasteurised fruit juices.
How is LTP allergy tested in the UK?
In the UK, LTP sensitisation can be assessed through specific IgE blood tests, including component-resolved diagnostics that measure antibodies to individual proteins such as Pru p 3. These tests can be arranged through private allergy screening services or via NHS allergy clinics, though NHS waiting times for specialist services may sometimes be longer. Blood testing is non-invasive and provides objective data to support clinical assessment.
Can exercise trigger LTP allergy reactions?
Exercise is recognised as a potential co-factor that may sometimes increase the likelihood or severity of LTP-related reactions. This is sometimes referred to as food-dependent exercise-induced reaction. Other co-factors may include alcohol consumption and certain medications. If you notice that symptoms seem more likely when eating and exercising in close proximity, this is an important detail to share with your healthcare provider.
Is LTP syndrome common in the UK?
LTP syndrome has traditionally been considered more prevalent in Mediterranean countries, particularly Spain and Italy. However, it is increasingly being identified in the UK, particularly in urban areas like London where plane tree pollen exposure is common. Greater awareness among healthcare professionals and improved access to component-resolved testing are contributing to more frequent identification of LTP sensitisation in UK populations.
Where can I get tested for LTP allergy in London?
Private allergy screening clinics in London, including The Allergy Clinic, offer specific IgE blood testing that can assess sensitisation to LTP components such as Pru p 3. Private testing can provide a convenient and timely option, with detailed results that can be shared with your GP or allergy specialist to support ongoing care and management decisions.
Taking a Proactive Approach to Understanding Your Health
Understanding whether LTP sensitisation may be contributing to your symptoms can be an empowering first step. Allergy blood testing provides objective information that can support informed conversations with your healthcare team, helping to clarify patterns and guide appropriate next steps.
At The Allergy Clinic, we offer a range of allergy screening services designed to provide clear, detailed results in a supportive and professional setting. If you have questions about fruit allergy testing or would like to explore whether LTP screening may be relevant for you, our team is here to help.
About This Article
This content has been prepared by a UK medical content team with expertise in allergy screening and immunological testing. All information is drawn from peer-reviewed research, established clinical guidelines, and current UK medical literature. The article has been developed in accordance with UK medical editorial standards and is intended to support public understanding of LTP syndrome and related allergy testing.
Medical Disclaimer
This article is intended for educational and informational purposes only. It does not constitute medical advice, diagnosis, or treatment recommendations. The information provided should not be used as a substitute for consultation with a qualified healthcare professional.
Individual symptoms, health concerns, and test results should always be assessed by an appropriate healthcare professional who can consider your full medical history and circumstances. No specific health outcomes are promised or guaranteed.
If you are experiencing symptoms that concern you — particularly severe or sudden reactions — please seek appropriate medical advice or urgent medical care without delay.
This content complies with UK GMC advertising guidance, CQC patient communication standards, and ASA regulatory requirements.
Written Date: 30 March 2026 Next Review Date: 30 March 2027