Plain sushi, made with rice, fish, and seaweed, is naturally gluten-free. But most sushi as it’s actually served in restaurants contains hidden sources of gluten in the sauces, seasonings, fillings, and even the rice preparation. If you’re avoiding gluten, the short answer is that simple nigiri and sashimi are your safest bets, while specialty rolls with sauces or fried elements are the riskiest.
Sushi Rice Can Contain Gluten
Rice itself is gluten-free, but sushi rice isn’t just rice. It’s seasoned with a mixture of rice vinegar, sugar, and salt. Most rice vinegar is safe, but some restaurants use non-distilled white vinegar made from corn or wheat. If the vinegar is wheat-based, the rice picks up gluten before it even reaches your plate. Some sushi restaurants also prepare their rice with a chicken broth that contains gluten, which is nearly impossible to detect by taste.
Soy Sauce Is the Biggest Culprit
Standard soy sauce is brewed with wheat. It’s one of the most concentrated sources of gluten in a typical sushi meal, and it touches almost everything. Soy sauce appears not just in the dipping dish but inside many rolls and sauces. Eel sauce (unagi sauce), the sweet glaze drizzled over dragon rolls and eel nigiri, is made with soy sauce as a base ingredient. Spicy mayo, teriyaki glaze, and ponzu sauce also commonly contain soy sauce.
Tamari is a Japanese soy sauce traditionally made without wheat, and many restaurants now stock it as a gluten-free alternative. If yours doesn’t, bringing your own small bottle of tamari is a practical workaround.
Tempura and Panko Are Made With Wheat
Any roll described as “crunchy,” “crispy,” or “tempura” almost certainly contains gluten. Traditional tempura batter is made with wheat flour. Panko breadcrumbs, used to coat shrimp or as a crunchy topping, are also wheat-based. This rules out popular options like shrimp tempura rolls, crunchy rolls, and spider rolls unless the restaurant specifically uses a gluten-free batter.
Cross-contamination is also a concern here. If the same fryer oil is used for tempura and other items, traces of gluten can transfer even to foods that wouldn’t otherwise contain it.
Wasabi and Imitation Crab
Real wasabi, grated from the wasabi plant, is gluten-free. The problem is that real wasabi is expensive, and the vast majority of sushi restaurants serve imitation wasabi made from horseradish, mustard, and food starch. Some commercial wasabi pastes use modified food starch that could be wheat-derived, though many brands use tapioca or corn starch instead. The only way to know is to ask what brand the restaurant uses or whether they serve real wasabi.
Imitation crab (surimi), the pink-and-white filling in California rolls and many other popular options, is another hidden source. It’s made from processed fish bound together with starch, and wheat starch is a common binder. If you’re strictly avoiding gluten, California rolls are off the table unless the restaurant confirms their surimi is wheat-free.
Miso Soup Isn’t Always Safe
Miso paste is made from fermented soybeans, but many varieties also contain grains. Rice-based miso (shiro or white miso) is typically gluten-free. Barley-based miso (mugi miso) and any miso made with wheat contain gluten. Most restaurants don’t specify which type they use, so you’ll need to ask. The dashi broth base is usually made from kelp and bonito flakes, which are naturally gluten-free.
What’s Safe to Order
Your lowest-risk options are sashimi (sliced raw fish with no rice), nigiri made with plain fish, and simple rolls that contain only fish, vegetables, and rice with no sauces or fried elements. Seaweed (nori) is naturally gluten-free. Avocado, cucumber, and fresh fish are all safe fillings.
- Safer choices: sashimi, salmon or tuna nigiri, cucumber rolls, avocado rolls, simple fish rolls without sauce
- Higher risk: California rolls (imitation crab), any tempura or crunchy roll, anything with eel sauce, spicy mayo, or teriyaki
- Hidden risks: sushi rice (vinegar source), soy sauce, miso soup, wasabi paste
How to Order at a Restaurant
Calling ahead or speaking with the chef before ordering makes a real difference. Beyond Celiac, a leading celiac disease organization, recommends asking the restaurant to use sterilized cutting surfaces and utensils when preparing your sushi, since shared cutting boards can transfer gluten from sauces and tempura flakes. Ask specifically about the vinegar in their rice, the type of wasabi they serve, and whether any broth is added to the rice.
Bring your own tamari if the restaurant doesn’t offer it. Request rolls with no sauce, or ask for sauce on the side so you can control what touches your food. At conveyor belt or buffet-style sushi spots, cross-contamination risk is higher because items sit near each other and shared utensils are common. A made-to-order restaurant gives you far more control over what ends up on your plate.