Hay fever is not only prevalent in Japan! It's becoming increasingly common among Taiwanese people too.
Every change of season, many people start with "sneezing as an opener," experience nasal congestion in the morning that makes it difficult to breathe, itchy eyes that disrupt sleep, and even a runny nose all day long, like a faucet turned on.
Do you think it's just air pollution or a sensitive constitution? In fact, pollen, dust, and changes in air quality can all trigger seasonal allergies.
But surprisingly——
Allergic reactions are sometimes not a nose problem, but a gut problem! More and more studies point out that:
"Dysbiosis in the gut" can lead to the immune system making incorrect judgments, treating harmless pollen as an enemy, and overreacting, triggering allergic symptoms.
Today, as a nutritionist, I will explain in the simplest way possible everything you need to know about 👇
Why does the gut affect pollen allergies?
This is not metaphysics; it is supported by scientific evidence.
️ 1. The gut is the body's largest immune organ.
Approximately 70% of immune cells reside in the gut.The more diverse and balanced the microbiota, the better the immune system can correctly distinguish between "real dangers" vs "harmless substances."
When the microbiota is out of balance, the immune system becomes "sensitive and overactive":
X Overreacts to pollen
X Releases large amounts of histamine
X Triggers nasal congestion, runny nose, and allergic rhinitis
Therefore, the gut is actually a key factor in allergies.
️ 2. If the gut barrier weakens, allergies are more likely to occur.
When the intestinal mucosa is damaged, too thin, or its permeability increases (commonly known as leaky gut):
Small molecules and sensitizing substances that shouldn't enter the body can pass through the intestinal wall more easily, stimulating an immune response.
It's like a small wooden house with a broken door; any foreign object can enter and cause chaos.
️ 3. The gut and respiratory tract are connected (gut-lung axis).
Studies show that changes in gut bacteria can affect immune responses in the nasal cavity and lungs.
This is why improving gut health not only benefits the digestive system but can also improve nasal allergies and asthma symptoms.
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How can probiotics help reduce pollen allergy symptoms?
Probiotics are not a panacea, but they do have several scientifically supported effects:
1. Regulate immunity and reduce overreactions.
Many people with allergic constitutions have immune systems that tend towards a Th2 type response, easily treating pollen as an enemy.
Lactic acid bacteria and bifidobacteria in probiotics can:
1.Increase immune balance (Th1 / Th2 regulation)
2. Promote "immune tolerance"
3.Reduce oversensitivity to pollen
This is key to improving an allergic "constitution."
2. Repair the intestinal barrier and reduce inflammation.
Some probiotics help to:
V Repair the intestinal mucosa
V Reduce leaky gut
V Lower inflammatory response
This is equivalent to reducing the body's chances of being "mistriggered."
3. Increase gut microbiota diversity.
Research shows that:"People with pollen allergies usually have lower microbiota diversity."
Supplementing probiotics + increasing quality dietary fiber =
(1) Restoring balance to the gut ecosystem
(2) Stabilizing the immune system
Practical advice from a nutritionist: improve your allergic constitution through diet
Below are strategies that are easy for most people to follow and are supported by scientific evidence:
1. At least 25–30g of dietary fiber daily.
Good gut bacteria thrive on "eating fiber." Recommended daily:
• Dark leafy greens (sweet potato leaves, water spinach, spinach)
• Stewed legumes (chickpeas, adzuki beans)
• Whole grains (brown rice, oats)
• High-fiber fruits (kiwi, apple, banana)
2. Consume natural fermented foods in moderation.
Choose: yogurt, unsweetened yogurt, miso, sauerkraut, natto, etc.
Note: If you are prone to bloating or have irritable bowel syndrome, increase intake gradually.
3. Supplement probiotics (choose the right strains).
Based on clinical research, pollen allergies commonly use:
• Lactobacillus plantarum
• Lactobacillus paracasei
• Bifidobacterium longum
• Bifidobacterium lactis
These strains are commonly used to modulate immunity and alleviate nasal allergy symptoms.
Recommendation: Start supplementing 4–8 weeks before pollen season for more stable results.
4. Practice good lifestyle management (hidden key to gut health).
• Get enough sleep (gut bacteria follow circadian rhythms).
• Reduce stress (stress directly kills beneficial bacteria).
• Regular exercise (increases microbiota diversity).
These are fundamental to managing allergies.
Environmental management during allergy season (probiotics work better when combined)
• Use an air purifier and regularly replace filters.
• Wear a mask outdoors and wash your face and nose upon returning home.
• Avoid opening windows (when pollen levels are high).
• Bathe and groom pets after they go outside.
Probiotics are for "internal regulation," while environmental management is for "external protection." Both must be done in parallel.
Probiotics are suitable for "constitution conditioning" and are not an immediate cure for a runny nose. Most people experience improved allergies and immune stability after continuous use for 4–12 weeks.
