Nut Allergy Labels in Japan: Why Some Nuts Are Listed and Others Are Not
Why I Wrote This Article
My friend lives with a nut allergy every day. In Japan, even for people who live here, it is not easy to choose foods while carefully checking every product for ingredients and allergen content. This is especially true for nuts that are not subject to mandatory labeling. Even when someone is being careful, uncertainty remains, and it can still be difficult to avoid them completely.
So what about tourists visiting Japan from overseas, or people who want to order Japanese foods from abroad? If any of them have a nut allergy, Japanese food labeling may feel even harder to understand.
In principle, we all have the right to know what is in our food. But if the clues needed to know are not sufficient, there may be people who cannot safely enjoy Japanese foods and snacks. That is how I felt.
For that reason, in this article, I wanted to organize how nuts are handled under Japan’s food labeling system, and explain as clearly as possible which ones are covered by labeling rules and which ones are not, but still deserve attention.
When people research nut allergies, many of them wonder things like, “Do I only need to watch out for the ones that are labeled?” or “If a nut is not included in the 28 allergen items, does that mean I do not need to worry about it?” But Japan’s food labeling system is not designed to list every possible allergenic food all at once. Instead, it selects items for labeling based on factors such as the number of reported cases and the risk of severe symptoms. The Consumer Affairs Agency reviews the covered items based on nationwide survey data, and the handling of tree nuts has been updated in recent years. For example, in April 2026, cashew nuts were added to the mandatory labeling category, and pistachios were added to the recommended labeling category.
The important point here is that whether something is labeled and whether it actually requires caution are not always the same thing. Some items are legally required to be labeled, while others are only recommended. There are also nuts outside the labeling categories that can still cause allergic reactions depending on the individual. As the Ministry of Health, Labour and Welfare and the Japanese Society of Pediatric Allergy and Clinical Immunology explain, food allergy is caused by an immune reaction to proteins in food, and both the trigger foods and the way reactions appear can vary from person to person. That is why it is important not to assume that “no label means safe,” but to understand the rules of the system separately from the practical precautions needed in real life.
From here, I will first review the nuts and seeds that are included among Japan’s 28 allergen items for food labeling, and then organize the main nuts that are not included in those 28 items but are still worth knowing about. Knowing which items are covered by the labeling system is an important clue when choosing food. But that alone is not enough to fully judge safety. In this guide, I will separate the system itself from the practical points of caution so that this distinction is clear.
1. Nuts and Seeds Included in Japan’s 28 Food Allergen Items
Food allergen labeling is not a system that broadly lists anything that might possibly be present. Japan’s system is based on actual health damage data and prioritizes items with a high number of reported cases or a higher likelihood of causing severe symptoms such as anaphylaxis. The Consumer Affairs Agency continuously reviews case numbers and severity through nationwide surveys and revises the covered items based on those results. Reviews of tree nuts have continued in and after 2024, and on April 1, 2026, cashew nuts were added as a “specified ingredient” while pistachios were added as an item “equivalent to specified ingredients.” This shows that the increase in health damage caused by tree nuts is directly reflected in revisions to the labeling system.
What is important here is that mandatory labeling and recommended labeling are not the same thing. “Specified ingredients” are items that are legally required to be labeled under Japan’s Food Labeling Standards. By contrast, items “equivalent to specified ingredients” are recommended for labeling based on official notification. Businesses are asked to label them as promptly as possible, but this does not carry the same legal force as specified ingredients. In other words, both are important to consumers, but their legal position and the strength of the labeling requirement are clearly different. That is why, when reading the allergen section of a package, it is important to understand whether an item is under the mandatory category or the recommended category.
1. "Nuts and Seeds" included in the 28 allergens listed:
This group is subject to mandatory or recommended labeling under Japanese law (Food Labeling Act).
Labeling Requirements (6 out of 28 items):
● Walnut (Mandatory) [Juglandaceae] Number one cause of allergic reactions among tree nuts.
Closely related to pecans.
● Peanut (Mandatory) [Fabaceae] Grows underground.
Belongs to a different family than other nuts and is more likely to cause severe reactions.
● Cashew Nut (Transitioning to Mandatory Labeling) [Anacardiaceae] Mandatory labeling decided for 2024. Strongly related to pistachios.
● Almond (Recommended) [Rosaceae] Widely used in confectionery.
Caution is needed regarding cross-reactions with Rosaceae fruits such as peaches and apples.
● Macadamia Nut (Recommended) [Proteaceae] Newly added in 2024.
Common in Hawaiian souvenirs and ice cream.
● Sesame (Recommended) [Sesame Family] Classified as a nut. An essential ingredient in Japanese sweets and dressings.
2. Main Nuts Not Included in Japan’s 28 Food Allergen Items
For items outside the labeling categories, the most important point to understand first is this: no label does not mean safe. The Consumer Affairs Agency also states that even for items equivalent to specified ingredients, if there is no label, it may be difficult to determine accurately whether the ingredient is not used at all or whether it is used but not labeled. The labeling system defines its covered items based on criteria such as case numbers and severity. Being outside the labeling category does not mean the risk of an allergic reaction is low. If you have a food allergy, you should not assume that an item is safe simply because it is outside the labeling system. It is necessary to check the ingredient list, contact the business if needed, and follow the guidance of your doctor.
Among nuts, cross-reactivity can become an issue between foods that belong to the same botanical family. Under the current system, walnut and pecan are both in the walnut family, while cashew and pistachio are both in the sumac family, and both pairs are treated as known combinations with cross-reactivity concerns. But this is also a point where misunderstanding must be avoided. It cannot be said that foods in the same family will always trigger a reaction, but it also cannot be said that foods in different families are automatically safe. The Consumer Affairs Agency has explained that cross-reactivity alone is not a sufficient reason to add an item to the labeling categories, while also recognizing that in clinical practice multiple tree nuts are often handled together for patient guidance, and that patients and businesses need appropriate information. In other words, whether something is covered by the labeling system and whether it requires caution in medical practice do not completely match. In nut allergies, understanding this gap is extremely important.
While allergic reactions are possible, there are currently no rules requiring individual labeling on the packaging for this group.
Careful checking of ingredients is necessary.
Major Nuts Not Subject to Labeling
● Pistachios [Anacardiaceae] Same family as cashews.
● Hazelnuts [Betulaceae] Widely used in chocolate and Western confectionery.
● Pecans [Juglandaceae] Very similar in composition to walnuts.
● Pine Nuts [Pinaceae] Used in pesto and Chinese cuisine.
● Coconuts [Arecaceae] Used in curries and ethnic sweets.
● Brazil Nuts [Lespedezaceae] Large nuts used in mixed nuts.
I have tried to summarize this as accurately as possible based on official information, but because the system may be updated and individual products may differ, this guide may not be completely exhaustive. When actually choosing foods, please also check the latest labeling and information from public institutions.
I hope this guide is helpful, even in a small way.
References
- Consumer Affairs Agency, “Information on Food Allergen Labeling”
- Consumer Affairs Agency (CAA), Government of Japan, Food Allergy Labeling in Japan / Japan’s Food Labelling System (English)
- Ministry of Health, Labour and Welfare, “Food Allergy Related Information”
- Japanese Society of Pediatric Allergy and Clinical Immunology, Food Allergy Clinical Practice Guidelines 2021 Digest Version
Search Keywords
- Consumer Affairs Agency food allergen labeling
- CAA Food Allergy Labeling in Japan PDF
- Ministry of Health, Labour and Welfare food allergy related information
- Japanese Society of Pediatric Allergy and Clinical Immunology Food Allergy Clinical Practice Guidelines 2021
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