Japan is one of the world's great food cultures — and one of the most challenging for people with serious food allergies. Understanding which allergens are hidden where, and how to communicate restrictions effectively, makes the difference between a safe and an anxious trip.
Japan's Eight Priority Allergens
Japan requires disclosure of eight allergens in packaged foods: wheat, buckwheat, eggs, milk, peanuts, shrimp, crab, and tree nuts. This labeling applies to packaged products — not to restaurant menus, where allergen disclosure is voluntary. The distinction matters: you can check a convenience store product's label, but a ramen shop is under no obligation to disclose all ingredients.
The Hidden Allergen Problem
Dashi (fish stock) is the foundation of Japanese cooking — miso soup, ramen broth, noodle soups, simmered vegetables, and many sauces contain kombu kelp and katsuobushi (dried bonito flakes). Fish allergy in Japan requires significant vigilance. Sesame appears as sesame oil in many preparations and as seeds on baked goods, sushi rice seasoning, and dressings. Soy sauce (shoyu) contains wheat — soy allergies and wheat/gluten sensitivities must both avoid standard soy sauce. Miso is soy and often wheat-fermented.
Communicating Allergies
Carry a printed allergy card in Japanese — this is the single most effective tool. The Allergy Translation app and Japan-specific allergy card generators (available at allergyeats.com and selectwisely.com) produce cards that list your specific allergens in Japanese with context that helps kitchen staff understand severity. Don't rely on verbal communication — even with translation apps, nuance is lost.
The Japanese phrase to learn: アレルギーがあります (arerugi ga arimasu) — "I have allergies" — followed by the allergen name: 小麦 (komugi, wheat), 卵 (tamago, egg), 乳製品 (nyūseihin, dairy), 落花生 (rakkasei, peanuts), えび (ebi, shrimp), かに (kani, crab).
Safest Food Choices
For gluten sensitivity/wheat allergy: Plain rice, sashimi (not with soy sauce), rice onigiri (check the seasoning), pure fruit, and fresh vegetables. Many Japanese restaurants can provide ponzu (citrus-soy) sauce or tamari (wheat-free soy) as alternatives if asked. For fish allergy: Sukiyaki (beef hotpot in sweet soy without dashi), yakiniku (grilled meat at table), and most pure meat dishes. Vegetable dishes are consistently high-risk for fish stock. For dairy: Japanese traditional cuisine uses almost no dairy. Western-influenced dishes (pasta, pizza, hotel breakfasts) require standard dairy vigilance.
Resources
AllergyEats Japan (allergyeats.com) lists allergy-friendly restaurants with verified information. Rakuten Travel's filter system allows searching for restaurants with specific allergen accommodations. The larger the restaurant and the more tourist-facing its operation, the more likely staff are trained to handle allergen requests — small, traditional counter restaurants are the highest-risk environments for complex allergies.
Related Guides
Frequently Asked Questions
How do I communicate food allergies in Japan?
Print an allergy card in Japanese before your trip — websites like allergyeats.com and selectwisely.com offer downloadable Japanese allergy cards. Show the card when ordering. Staff take allergies seriously and will check with the kitchen.
What allergens are most hidden in Japanese food?
Dashi (fish stock from bonito/tuna) is invisible but present in countless 'vegetarian' dishes, miso soup, and noodle broths. Shrimp and shellfish are in many sauces. Sesame is widespread. Soy is in almost everything.
Are there allergy-friendly restaurants in Japan?
Yes, increasingly. The HappyCow app covers allergy-friendly and vegan options. Major hotel restaurants in international hotels can typically accommodate detailed allergy requests with advance notice. Some specialist allergen-free restaurants exist in Tokyo and Osaka.
What Japanese foods are safe for most common allergies?
Plain rice (gohan) is safe for most allergies. Fresh sashimi (raw fish slices, no marinade) is safe if seafood is tolerated. Grilled meat and plain vegetable dishes are generally safe. Avoiding sauces and soups eliminates most hidden allergens.