Vegetarian, vegan and halal requirements in Japan are difficult and well documented, and we have written about them. Medical food allergy is a different problem and it is handled differently, because the consequence of getting it wrong is not a disappointed client — and because the systems that help with preference do not help much with risk. This is the note to read before accepting a booking with a severe allergy on it.
What the labelling law actually covers
Japan has a genuine, enforced allergen labelling regime, and it is better than many markets. Two things about it matter to the trade:
- It applies to packaged food. A mandatory list of specified allergens — among them egg, milk, wheat, buckwheat, peanut, shrimp, crab and walnut — must be declared on pre-packaged products, with a longer list of recommended declarations alongside it. A client who reads Japanese, or who uses a reliable translation app on a wrapper, is well served.
- It does not extend to food served in restaurants. Meals prepared and served on the premises are outside the packaged-food declaration requirement. A restaurant may have excellent internal knowledge or none at all, and nothing legally compels the printed menu to tell you.
So the label is reliable and the menu is not. For an agent, that inverts the usual assumption — a convenience-store sandwich may be the safest item on a travel day, and the kaiseki dinner the hardest to verify.
The ingredients that catch visitors out
- Dashi. Japanese stock is typically made with katsuobushi (dried bonito) and often kombu. It is in soups, simmered dishes, sauces, dressings, egg dishes and a great deal that looks like it contains no fish whatsoever. This is the number one cause of accidental fish exposure in Japan, and it is also why "vegetarian" and "no fish allergy" are not the same conversation.
- Soy sauce contains wheat, almost always. A coeliac client who assumes soy sauce is a safe Asian condiment will be wrong throughout the trip. Wheat-free tamari exists and is not the default.
- Buckwheat is a major allergen here and a staple food. Soba is buckwheat; so is much else, and cross-contact in a soba restaurant is essentially unavoidable. A buckwheat allergy rules out venue categories, not just dishes.
- Sesame, in oil and seed form, is pervasive in dressings and finishing.
- Shellfish and crustacean stock turn up in ramen broths and sauces well beyond the obvious dishes.
- Cross-contact in shared fryers and on shared grills is routine, and teppanyaki and tempura venues are difficult for that reason.
How to brief this properly
- Get the medical detail at booking, in writing. Allergen, severity, whether trace exposure is a risk, whether the client carries an adrenaline auto-injector. "No seafood" from a booking form is not usable information.
- Use a written allergy card in Japanese, naming the specific allergen and stating clearly that trace amounts matter. This is worth more than any conversation through an app, because it can be handed to the kitchen rather than relayed by the floor staff. Our language and communication guide covers the wider point.
- Brief venues in advance, not at the table. A set-menu restaurant, a ryokan kaiseki dinner or a group banquet is built days ahead. Notice given on arrival often produces a plain substitute plate at best, and a polite refusal to serve at worst. Group dining mechanics are in the group restaurant bookings guide.
- Expect and respect refusal. Some kitchens will decline to guarantee an allergen-free dish rather than risk it. That is a responsible answer, and the correct response is to change venue, not to press.
- Carry the medical layer. Confirm the client travels with their own auto-injector and a doctor's letter; do not assume a local equivalent can be obtained quickly. Emergency numbers, the nearest capable hospital for each overnight stop and the insurance position all belong in the file — see the travel insurance and medical care guide.
Where it gets harder, and where it gets easier
Harder: rural ryokan with fixed kaiseki menus; izakaya and small owner-operated restaurants with no written ingredient records; food tours and street-food programmes, where the whole product is sampling things nobody can fully specify; and any venue where the meal is cooked communally.
Easier: international hotel restaurants; larger modern chains with printed allergen matrices; department-store food halls and convenience stores, where the packaged labelling regime applies in full; and a private-dining arrangement where the chef is briefed as a client requirement rather than an exception.
The practical shape of a well-built file is usually: hotel breakfasts and one or two properly briefed dinners, with the rest of the client's eating built around packaged and labelled food they can verify themselves. That is a less romantic Japan food itinerary than the brochure, and it is the one that does not end in an ambulance.
FAQ
Does Japan require restaurants to list allergens? No. The mandatory declaration regime applies to pre-packaged food. Restaurant meals prepared on the premises are outside it, so a menu carries no legal obligation to identify allergens even though packaged products do.
What is the most common hidden allergen in Japanese food? Dashi, the fish stock made from dried bonito, which appears in soups, sauces, dressings and simmered and egg dishes that otherwise contain no visible fish. Wheat in soy sauce is a close second.
Can a client with a severe buckwheat allergy travel in Japan? Yes, with care. Buckwheat is a staple and cross-contact in soba restaurants is effectively unavoidable, so the allergy rules out venue categories rather than individual dishes, and the itinerary is built around that.
What should an agent collect at booking? The specific allergen, the severity, whether trace exposure is a risk, and whether the client carries an adrenaline auto-injector — in writing. A general note such as "no seafood" is not enough to brief a kitchen with.
Will restaurants accommodate allergies? Many will, if briefed in advance. Some will decline to guarantee a dish rather than take the risk, which is a responsible answer — the right response is to change venue rather than to insist.
Where this fits in our Japan programmes
- Services — Culinary tours in Japan · Guide services in Japan · Travel insurance in Japan
- Destinations — Kyoto · Osaka
Allergy-safe itineraries, venue briefing, Japanese allergy cards and medical contingency planning: write to b2b@explera.jp, message the trade desk on WhatsApp at +66 93 656 8090, or register on the B2B portal. Proposals within 24 hours. IATA TIDS 96215733, ASTA member 900408341.
