Overview
About Wasabi
Most wasabi eaten outside Japan is not wasabi.
Real Wasabia japonica is slow, fussy and expensive to grow, so the green paste in tubes, in sachets and on supermarket sushi is usually horseradish plus mustard, colouring and a binder, with little or no actual wasabi rhizome in it. That matters for a trigger journal, because what you are really recording is the substitute's ingredient list rather than the plant. Wasabi is graded D for FODMAPs and D for polyols here, and prepared paste is a large part of why: sorbitol is a standard ingredient in tube wasabi, used to keep it moist. Everything else sits in the borderline band rather than the high one, with histamine B, histamine liberator B, tyramine B, salicylate B, oxalate B, sulfite B, nickel B and glutamates B.
Sensitivities
How Wasabi scores
Watch for
What trips people up
- Polyols D and FODMAPs D. Check the tube for sorbitol, which is added to commercial wasabi paste as a humectant. If polyols are your known trigger, freshly grated horseradish root has a one-item ingredient list and none of it
- Read the paste, not the name. Typical tube ingredients are horseradish, mustard, oil, salt, thickener and colours, often a blue and a yellow used together to make green, or spirulina in the natural versions. If you react to azo colourings or to mustard, that is the exposure, not the wasabi
- The heat is chemically different from chilli. Wasabi and horseradish heat comes from allyl isothiocyanate, which is volatile, so it rushes into the sinuses and fades within a couple of minutes. Chilli capsaicin stays on the tongue and lingers. Streaming eyes and a nose hit are an irritant response and not by themselves an allergic one
- The borderline grades stack. Histamine B, liberator B, tyramine B and glutamates B are individually mild, but wasabi almost never arrives alone. Soy sauce, pickled ginger and vinegared rice are all on the same plate, and the meal as a whole may be the trigger
- Freshly grated real wasabi loses its pungency fast, within roughly fifteen minutes, because the compound responsible evaporates. Restaurants that serve the real thing grate it to order, which is a useful tell for what you actually ate
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Wasabi
Is the wasabi at sushi restaurants real wasabi?
Usually not. Genuine Wasabia japonica takes a year or more to grow in cold running water and is priced accordingly, so the overwhelming majority of wasabi served outside Japan, and plenty inside it, is horseradish with mustard and green colouring. Some products contain a small percentage of real wasabi and say so on the label. If it comes from a tube or a sachet and stays pungent, assume horseradish.
Is wasabi low FODMAP?
No, it is graded D for FODMAPs and D for polyols. Commercial wasabi paste commonly contains added sorbitol, which is a polyol, so the prepared product carries more of a FODMAP load than the grated root would. Checking the ingredient panel is worth more here than portion-guessing, because formulations differ a lot between brands.
Is wasabi high in histamine?
No. Wasabi is graded B for histamine and B for histamine liberation, both borderline rather than high. On its own, in the amount actually eaten, it is unlikely to be the main histamine driver of a meal. The company it keeps is more relevant: soy sauce, aged fish and pickles on the same plate carry considerably more.
Why does wasabi burn your nose instead of your tongue?
Because the compound responsible, allyl isothiocyanate, is volatile. It leaves the paste as a vapour and reaches the nerve endings in your nasal passages, which is why the sensation shoots upward and then disappears within a minute or two. Capsaicin in chilli is an oil-soluble compound that binds to receptors on the tongue and stays put, which is why chilli heat builds and lasts.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.