Tamari (Gluten-Free Soy Sauce)
Processed · Asian Sauces
Yes. Tamari is rated green at the tested 2 tablespoons, 42 g, with nothing recorded in any of the six FODMAP groups. It is worth being clear about why the bottle exists, though, because it was never designed as a gut-friendly product. Tamari is the Japanese soy sauce brewed with little or no wheat, and wheat is a coeliac question rather than a FODMAP one.
Last updated 4 September 2026Serving sizes for tamari (gluten-free soy sauce)
Two tablespoons, 42 g, is the tested amount, and every group reads zero.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 2 tablespoons | 42 g | None detected |
Breakdown for 2 tablespoons
Is tamari (gluten-free soy sauce) low FODMAP?
Tamari began as the liquid that drains off fermenting soybean paste, which is why it pours darker and thicker than a wheat-brewed bottle and tastes rounder, without the sharp top note. More soybean goes into it rather than less, so a clean reading looks surprising given how much GOS whole soybeans carry. What ends up in the bottle is not the bean. It is strained liquid from a long ferment, and the oligosaccharides stay behind in the solids that get pressed away.
Tamari (Gluten-Free Soy Sauce) and IBS: what to know
Tamari is a tidy illustration of two lists that overlap without matching. Gluten-free means no wheat, barley or rye protein. Low FODMAP means no excess of six fermentable carbohydrates, and plenty of gluten-free products fail the second test while sailing through the first, since gluten-free stocks, sauces, crisps and ready meals routinely list onion powder and garlic powder, both red in this guide. It runs the other way too: wheat pasta is rated green at a tested serve, because with IBS it is the fructans in wheat that matter, not the gluten.
Gut-friendly ways to eat tamari (gluten-free soy sauce)
Tamari gets tasted neat more often than ordinary soy sauce does, so the flavour difference actually shows. It suits a dipping bowl beside salmon nigiri or dumplings, where a sharper sauce can bully everything else. Brush it over salmon with maple syrup and grated ginger before roasting, or stir a teaspoon through soba noodles. Supermarket shelf labels tend to say gluten-free soy sauce rather than tamari, and a few brands still include a small proportion of wheat, so the back of the bottle earns a look.
Frequently asked questions
Is tamari gluten-free?
Usually, but not automatically. Traditional tamari is brewed from soybeans with little or no wheat, and most bottles on sale today contain none at all. Some do, and the word tamari by itself is not a guarantee, so anyone with coeliac disease should buy one carrying a certified mark. With IBS alone the question is moot, since the wheat in ordinary soy sauce does not surface as fructans at the amount tested.
Is tamari better than soy sauce for IBS?
The data does not separate tamari from soy sauce: both come in green at 2 tablespoons with nothing recorded in any group, so changing bottles will not change how a stir-fry sits afterwards. Choose on taste, and on whether wheat is a problem for you for reasons unrelated to IBS. Tamari is the fuller and less sharply salty of the pair, which some people prefer in dressings.
Can I use tamari instead of soy sauce in recipes?
Yes, measure for measure. It is thicker and darker, so it clings better in a glaze and reads deeper in a braise, and many brands are a little less salty, meaning a dish seasoned to taste may want a touch more. In marinades and stir-fries the swap is invisible. The place it shows is a raw dressing, where that rounder flavour is either the point or the problem.
Does gluten-free mean low FODMAP?
No, and treating them as one list is a common and expensive mistake. Gluten-free bread is rated green here, and so is ordinary wheat sourdough, while a great many gluten-free sauces, stocks and seasoning packets are red because of the onion and garlic in them. Tamari happens to satisfy both lists at once, which is convenient rather than meaningful.
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