Soba (buckwheat)Foods that are prone to causing anaphylaxisis

- Why are they called "foods that are prone to anaphylaxis"? -

Positioning within Japan's national data

conducted by the Consumer Affairs Agency
The Nationwide Survey of Immediate Food Allergy (Fiscal Year 2024, n=6,033) found that
Soba is not among the top 5 causative foods.。

On the other hand, a certain number of immediate-type reactions are reported annually,
In clinical practice Ingredients that are not frequently consumed but can cause severe illness
is recognized as.

📊 In fact, Japanese epidemiological studies have
Approximately 4-60 cases of buckwheat-related anaphylaxis per 100,000 schoolchildrenis being reported,
Patients with buckwheat allergiesAbout half of them experience anaphylaxis.before the onset of the influenza season.

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Why are buckwheat allergies more likely to be severe?

The reason why soba is said to be "prone to causing anaphylaxis" is
Properties of Allergen ProteinsIt is located in.

Buckwheat is a major allergen.
(Page 1, Page 2, Page 3, etc.) are,

Difficult to break down by digestive enzymes (pepsin)
Easily reaches the small intestine while maintaining antigenicity in the digestive tract

This has been demonstrated in multiple basic and clinical studies.

As a result,
🌾 even with very small doses, it is strongly recognized by the immune system
Within minutes of ingestion
Accompanied by skin symptoms, respiratory symptoms, low blood pressure, and impaired consciousness.
Severe anaphylaxiscan lead to.

🌏 "High-risk foods" internationally

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Soba allergies are considered particularly important in Asian regions such as Japan and Korea.

Furthermore,
The European Allergy-Vigilance Network (Allergy-Vigilance Network)
Buckwheat

High frequency of anaphylaxis
・Symptoms are severe
High recurrence rate

For this reason,
Ingredients proposed for addition to food items subject to disclosure/regulationIt also is.

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When did people start eating soba?

Under the current guidelines,
"At what age is it okay to start eating soba?"
No specific age criteria have been provided.。

However, in Japanese clinical settings and explanations for guardians,

👶 Around 1.5 to 2 years old or older
A day when you feel well
In small quantities
・During the day (when it's easy to visit medical institutions)

And,Introduce more carefully than other foodsIt is common to be done.

This is,
This is due to safety precautions, taking into account the fact that even small amounts can lead to severe illness.

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Summary

Soba, though not eaten frequently,
Foods that are likely to cause anaphylaxis even in small amounts in sensitized individualsbetween 27 and 36 weeks of pregnancy.

Even during periods like the year-end and New Year holidays when opportunities to eat increase,
Soba is a food that doesn't need to be rushed.

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References
Consumer Affairs Agency
Reiwa 6th year Immediate Food Allergy National Monitoring Survey

・Kajita N, Yoshida K.
Buckwheat Allergy in Asia.
Curr Allergy Asthma Rep. 2024

・Yanagida N et al.
Reactions during buckwheat oral food challenges are rare but often anaphylactic.
Int Arch Allergy Immunol. 2016

Tanaka K, et al.
Pepsin-resistant 16-kDa buckwheat protein is associated with immediate hypersensitivity.
Int Arch Allergy Immunol. 2002

・Sabouraud-Leclerc D et al.
Food Anaphylaxis: Eight Food Allergens Without Mandatory Labeling.
Clin Exp Allergy. 2025