The Diet-Allergy Link: Can What You Eat Make Hay Fever Worse? | Deanna Thomas Middlesbrough
Most hay fever advice focuses on what is outside: pollen counts, window-closing times, sunglasses, nasal sprays. What is inside, specifically what you are eating and how your gut is functioning, rarely gets mentioned. Which is a gap, because the connection between diet, gut health, and immune reactivity is increasingly well-established, and making some relatively simple shifts during pollen season can meaningfully reduce your overall allergic load.
This is not about finding a miracle food that cures hay fever. It is about understanding that your immune system does not operate in isolation from the rest of your body. What you eat affects your gut microbiome, your gut microbiome affects your immune regulation, and your immune regulation directly governs how severely your system reacts to pollen. Small, consistent changes in that chain can compound meaningfully across a season.
Key Takeaways- The gut microbiome plays a direct role in regulating the Th1/Th2 immune balance that underlies allergic reactivity. Diet is one of the primary levers that shifts it
- Ultra-processed foods, excess sugar, and certain dietary patterns promote gut dysbiosis and increase the inflammatory baseline that amplifies hay fever symptoms
- Quercetin, a naturally occurring flavonoid found in onions, apples, capers, and berries, has been shown in preclinical studies to reduce IgE, histamine, and key inflammatory cytokines involved in the allergic response
- In Traditional Chinese Medicine, excess consumption of cold, damp, and sweet foods weakens Spleen Qi and produces Phlegm accumulation in the Lung, directly mapping onto increased mucus and nasal congestion
- These dietary shifts are most effective as a complement to acupuncture treatment, not as a standalone intervention
- The goal is reducing total allergic load, not eliminating entire food groups. Small consistent changes compound across a season
A note on what this post is and is notThis is not a restrictive diet protocol or an elimination plan. The goal is practical, accessible information about which foods add to your allergic load and which can help reduce it, so that you can make informed choices without overhauling your entire way of eating. Most of what is recommended here is adding things, not taking things away. The changes that make the biggest difference during pollen season are often smaller than people expect.
Certain foods increase total histamine load and systemic inflammation during pollen season. Understanding which ones, and in what quantities, is more useful than blanket restriction.How Your Gut Shapes Your Allergic Response
The gut microbiome, the community of bacteria, fungi, and other organisms living in your digestive tract, is one of the primary regulators of immune function. It influences the balance between Th1 cells (the part of the immune system that fights infection) and Th2 cells (the part involved in allergic reactions). When the microbiome is diverse and well-nourished, Th1 and Th2 stay in relative balance. When it is depleted by poor diet, antibiotics, stress, or lack of dietary fibre, the Th2 pathway tends to dominate, which means the immune system leans toward allergic reactivity.
This is not a small effect. Research into the gut-immune axis has established it as a significant driver of allergic disease prevalence, and dietary choices are one of the most modifiable factors in gut microbiome composition. You cannot change your genetics or your local pollen count. You can, over weeks and months, meaningfully shift your gut environment in a direction that supports better immune regulation.
What Traditional Chinese Medicine Has Always Known
In Traditional Chinese Medicine, the Spleen and Stomach govern digestion, fluid transformation, and the production of the body's vital substances. When these organ systems are weakened by cold, damp, or excessively sweet foods, they lose their ability to transform fluids efficiently. The result is an accumulation of Phlegm and Dampness that settles in the Lung, producing the thick mucus, nasal congestion, and post-nasal drip that characterises the worst hay fever presentations.
This is not metaphor. The TCM observation that dairy products, cold drinks, refined sugar, and processed foods worsen respiratory and nasal symptoms predates the science by centuries. The biomedical explanation, via gut dysbiosis, increased inflammatory cytokine production, and impaired mucosal barrier function, arrived later but points to the same underlying reality. What you eat affects how your mucous membranes function and how readily your immune system mounts an inflammatory response.
"Acupuncture addresses the Spleen and Lung patterns driving allergic reactivity. Diet supports or undermines that work. Both matter, and together they produce better results than either alone."
Foods That Increase Your Allergic Load
During pollen season, certain foods add to the total inflammatory and histamine burden your body is already carrying. None of these are foods to eliminate permanently or rigidly avoid. They are foods worth moderating when your immune system is already under seasonal pressure.
Foods to Moderate During Peak Season
Think of this as turning down the volume on your inflammatory load while the pollen is high, not as a permanent dietary restriction. Small reductions compound across the season.
Increase allergic load
- Refined sugar and sugary drinks
- Ultra-processed foods (ready meals, crisps, fast food)
- Excess dairy during symptomatic periods
- Alcohol, particularly red wine and beer
- Fermented foods in large quantities (sauerkraut, kefir, kimchi)
- Tinned fish (sardines, tuna, mackerel)
- Aged and smoked cheeses
- Cold foods and iced drinks (weakens Spleen Qi in TCM)
Support immune balance
- Onions and spring onions (high quercetin)
- Apples, especially with the skin on
- Berries: blueberries, blackberries, strawberries
- Capers and caper berries
- Dark leafy greens: kale, cavolo nero, spinach
- Oily fish: salmon, mackerel eaten fresh (not tinned)
- Ginger and turmeric (anti-inflammatory)
- Fibre-rich foods: legumes, oats, root vegetables
Individual responses vary. A food and symptom diary during peak season is the most practical way to identify your personal pattern.
Quercetin: The Natural Allergy Compound in Your Fruit Bowl
Quercetin is a flavonoid compound found naturally in a range of everyday foods. It has attracted considerable research interest for its anti-allergic properties, and while most of the clinical evidence comes from preclinical models rather than large human trials, the mechanism is well understood and the research picture is promising.
🧅Onions
The richest common dietary source of quercetin, particularly red and white onions
🍎Apples
Concentrated in the skin. Eating whole rather than juiced preserves more quercetin
🫐Berries
Blueberries, blackberries, and elderberries all carry meaningful quercetin content
🌿Capers
Gram for gram, one of the most quercetin-dense foods available
What the Research Shows on QuercetinA 2025 systematic review and meta-analysis in Frontiers in Pharmacology examined 13 preclinical studies of quercetin in allergic disease models. Across these studies, quercetin significantly reduced total IgE, allergen-specific IgE, and histamine levels. It also suppressed infiltration of eosinophils and macrophages, reduced pro-inflammatory IL-4 and TNF-alpha, and increased IFN-gamma, contributing to Th1/Th2 immune rebalancing. The researchers identified quercetin's anti-allergic action as working through multiple simultaneous pathways rather than a single mechanism.
A separate review published in Allergy, Asthma and Clinical Immunology described quercetin's capacity to inhibit histamine production and pro-inflammatory mediators, regulate Th1/Th2 balance, and decrease allergen-specific IgE release, concluding that it has significant potential as a complementary approach for allergic conditions.
Lv Z et al., Frontiers in Pharmacology (2025) · doi.org/10.3389/fphar.2025.1673712
Jafarinia M et al., Allergy Asthma Clin Immunol (2020) · doi.org/10.1186/s13223-020-00434-0
A note on the evidence: the quercetin research reviewed here is predominantly from animal models. Human clinical trials for quercetin specifically in allergic rhinitis are limited. This does not mean the effect does not translate to humans, but it means we cannot cite the same strength of evidence as for acupuncture or pharmaceutical interventions. What the preclinical research demonstrates clearly is the mechanism: quercetin acts on the same IgE and cytokine pathways involved in human hay fever. Including quercetin-rich foods in your diet during pollen season costs nothing and carries no risk.
How Diet and Acupuncture Work Together
Diet is not a replacement for treatment. Eating more onions will not resolve a severe hay fever picture any more than eating more vitamin C will cure a chest infection. What dietary changes can do is reduce the total load that your immune system and acupuncture treatment are working against, which tends to make treatment more effective and the results more sustained.
At my Middlesbrough clinic, I discuss diet as part of every hay fever treatment conversation. Not as a rigid prescription, but as practical context: here are the things that are likely working against what we are trying to achieve, and here are some small shifts that can support it. Most patients find one or two changes they can realistically make and stick to them for a season. That is enough to make a difference without making eating feel like a project.
The acupuncture side addresses the Spleen and Lung patterns at the root. Dietary adjustments reduce the dietary input that continually stresses those same systems. Both moving in the same direction at the same time tends to produce results that neither achieves as well alone. For patients across Teesside working with me through hay fever season, the patients who make even modest dietary adjustments alongside treatment consistently report better outcomes than those who treat in isolation.
Where to Start This Week
1
Add onions to two meals a dayRed onion raw in salads, white onion cooked in almost anything. This is the single easiest way to significantly increase quercetin intake without changing what you eat. Most people find this entirely achievable within their existing cooking habits.
2
Swap one sugary drink a day for water or herbal teaSugar is one of the most consistent promoters of gut dysbiosis and systemic inflammation. One reduction makes a measurable difference to your gut environment over two to three weeks. Aim for the biggest source first rather than trying to remove everything at once.
3
Add one portion of fibre-rich food at each mealLegumes, oats, root vegetables, and leafy greens all feed the beneficial bacteria that regulate your immune response. Aim for variety rather than large quantities of any single food. Diversity of plant foods is the strongest predictor of gut microbiome diversity.
4
Keep warm food and drink warmIn TCM terms, cold and iced foods and drinks weaken Spleen Qi and promote fluid accumulation. During pollen season, eating food at room temperature or above and avoiding iced drinks costs nothing and can make a noticeable difference to mucus production and nasal congestion, particularly in the mornings.
5
Reduce alcohol on high-pollen daysAlcohol, particularly red wine and beer, is high in histamine and triggers mast cell degranulation independently. On days when the pollen count is already high and your immune system is already reactive, alcohol compounds the load significantly. Saving it for lower-count days or reducing quantities during peak season is the most practical approach.
Your PractitionerDeanna Thomas
BSc (Hons) Acupuncture · MBAcC · DipObsGyn · CNHC Registered
Working with patients across Middlesbrough, Yarm, Stockton, and the wider Teesside area since 2021, I always discuss diet as part of hay fever treatment, not as a prescription but as practical context for the work we are doing together. Over 800 five-star reviews reflect the difference that a whole-picture approach makes compared to treating the allergy in isolation.
What you eat is one lever among several. For most people, one or two focused changes during the season is all it takes to notice a meaningful difference.
Frequently Asked Questions
Does dairy really make hay fever worse?
The dairy-mucus link is more complex than popular belief suggests. Research on whether dairy directly increases mucus production in healthy individuals is mixed. In TCM, however, dairy is considered a Damp and Phlegm-producing food, particularly when consumed cold, and its effect on Spleen Qi is well-described clinically. What is clearer is that during active hay fever when the nasal mucosa is already inflamed, many patients find that reducing dairy consumption, especially cold dairy like milk and ice cream, produces a noticeable improvement in congestion. Whether this is direct mucus production or something else in the inflammatory picture is less important than the observed clinical effect.
Is quercetin worth taking as a supplement?
Quercetin supplements are widely available and carry a good safety profile. The preclinical evidence for the mechanism is strong, though large-scale human trials specifically for allergic rhinitis are limited. If you want to use a supplement in addition to dietary quercetin, doses of 500 to 1000mg daily are commonly used in the research literature. That said, dietary quercetin from food carries no cost and no risk, and adding it through onions, apples, and berries is a reasonable first step before considering supplementation. If you are taking blood thinners or other medications, check with your GP before adding any supplement.
How long does it take to notice a difference from dietary changes?
Gut microbiome composition begins to shift within two to three weeks of consistent dietary change, which means the immune regulatory effects follow on a similar timescale. For the more immediate effects, such as reduced mucus from cutting back on dairy or reducing the histamine spike after a glass of wine, the difference can be felt within days. Starting dietary adjustments at the same time as acupuncture treatment, rather than waiting, tends to produce the best overall outcome across the season.
Do I need to follow a strict elimination diet for this to work?
No. Strict elimination diets are not necessary and often counterproductive in the long run because they are unsustainable. The goal is reducing total allergic load during the season, not achieving dietary perfection. The patients who benefit most from dietary adjustments are those who make one or two consistent changes and maintain them, not those who attempt a complete overhaul and abandon it after two weeks. Identify the foods in your current diet that are most likely adding to your inflammatory burden, reduce those moderately, and add one or two anti-inflammatory foods. That is all it takes.
Can diet alone control my hay fever?
For mild hay fever in someone with an otherwise healthy gut and immune system, dietary improvements can make a meaningful difference. For moderate to severe presentations, or for long-standing patterns with multiple sensitivities, diet is one useful tool among several rather than a sufficient standalone intervention. Acupuncture addresses the immune and nervous system patterns at a depth that dietary changes alone cannot reach. The two together, with acupuncture treating the root and diet reducing the ongoing burden, tend to produce the most complete improvement across a season.
Final Thoughts
Hay fever management tends to focus on the outside world: pollen forecasts, medication timing, protective glasses. The inside picture, what you are eating and how your gut is functioning, rarely gets the same attention. That is a gap worth closing, because the gut-immune connection means that what happens at your kitchen table has a measurable effect on how reactive your immune system is when you step out the front door.
None of this requires perfection or a complete overhaul of how you eat. The five practical steps in this post are achievable changes that compound across a pollen season without making food feel like a medical project. Pair them with acupuncture treatment and the effect is considerably greater than either alone.
If you would like to explore acupuncture for hay fever at my Middlesbrough clinic, or talk through how treatment and dietary support can work together for your specific picture, you are welcome to get in touch. No obligation. Just a conversation about what might make this season different.
Small changes. Big difference across a season.
Diet and acupuncture together address hay fever from two directions at once. Find out what that looks like for your specific situation.
Find Out More No obligation. Just a conversation about what might help.