Is sushi gluten-free? The fish is — the soy sauce isn't

The short answer

Mostly yes — but not automatically. Plain raw fish and rice are naturally gluten-free, so sashimi and simple nigiri are usually fine. The problem is everything around them: the soy sauce is brewed with wheat, and several common sushi-bar items hide gluten. Knowing the short list of culprits is the whole game.

This is part of our coeliac coverage. For the bigger picture — what 'gluten-free' can and can't mean in Japan, and certified kitchens — read the gluten-free Tokyo guide.

What's naturally safe

• Sashimi — just fish, no rice, no sauce. The safest order, as long as it is plated and cut on clean surfaces.
• Plain nigiri — fish over vinegared rice. Rice is gluten-free; see the rice-vinegar caveat below.
• Simple maki with fish and vegetables (tuna, cucumber, salmon) — no tempura, no imitation crab, no sauce.

The hidden gluten to avoid

• Soy sauce. Ordinary Japanese soy sauce is fermented with wheat — it is the single biggest source of gluten in a sushi meal, both in your dipping dish and inside marinades and glazes (Beyond Celiac: is sushi gluten-free?).
• Imitation crab (surimi). The 'crab' in a California roll is usually pulverised white fish bound with wheat starch — not gluten-free.
• Eel and 'unagi' sauce, teriyaki and spicy-mayo drizzles — soy-sauce- and sometimes wheat-thickened.
• Anything tempura (shrimp tempura rolls, tempura flakes/tenkasu) — wheat batter.
• Rice vinegar. Sushi rice is seasoned with vinegar; most is fine, but some seasoned rice vinegars or rice wines can contain gluten, so it is worth confirming at a strict-needs meal.
• Cross-contamination — shared soy-sauce brushes, the same water for tempura and noodles, and crumbs on the counter. A normal sushi bar is not a coeliac-controlled kitchen.

How to order safely: tamari

The fix for the soy-sauce problem is tamari — a soy sauce traditionally made with little or no wheat. Crucially, not all tamari is gluten-free, so it must be the version labelled wheat-free/gluten-free (Kikkoman: tamari vs soy sauce). Many coeliac travellers carry a small bottle of certified gluten-free tamari and use it instead of the table soy sauce. Ask whether the rice vinegar and any glazes are wheat-free, and stick to sashimi or plain nigiri when unsure.

Say it: "Komugi arerugī ga arimasu" — I have a wheat allergy. "Shōyu wa tsukaemasen" — I can't use soy sauce. The full set is in our Japanese dietary phrases guide, and for severe allergies see allergy-aware dining in Tokyo.

Where to eat it

A conveyor-belt or market sushi counter is easy to navigate once you stick to sashimi and plain fish — our Tokyo market sushi guide and how to eat sushi cover the etiquette. For adjacent fish-forward diets, pescatarians have it easiest of all in Tokyo — see the pescatarian Tokyo guide.

The bottom line

Is sushi gluten-free? The fish and rice are; the soy sauce, imitation crab, tempura and some sauces are not. Order sashimi or plain nigiri, bring or ask for gluten-free tamari, and check the rice vinegar — and sushi becomes one of the easiest gluten-free meals in Japan.