Mushroom (shiitake)
Vegetables · Other Vegetables
One small dried shiitake, 10 g, is already rated red. That single mushroom carries 0.25 g of mannitol, past the 0.2 g point at which a polyol starts counting against a portion, and no smaller or green serve appears in the data. Shiitake goes into a pot for depth of flavour rather than for bulk, so the useful question is what replaces the flavour.
Last updated 3 September 2026Serving sizes for mushroom (shiitake)
One small dried mushroom (10 g) is rated red. No green serve has been tested.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1 small dried mushroom | 10 g | Mannitol 0.25 g |
Breakdown for 1 dried mushroom
Is mushroom (shiitake) low FODMAP?
Mannitol is the whole story: every other group reads zero. What makes the figure striking is the weight it is attached to, because 10 g is dried weight, and one dried cap swells into a mushroom several times that size once it has soaked. Mannitol dissolves in water too, which matters more here than for most foods, since the soaking liquid is exactly what recipes tell you to keep and pour into the broth. Straining the caps out does not leave the mannitol behind in the sieve.
Mushroom (shiitake) and IBS: what to know
Per gram it is the most concentrated of the mushrooms measured in this guide: one small dried cap holds 0.25 g of mannitol, while a whole small button mushroom at 15 g holds 0.12 g and is rated amber. Shiitake also hides well. It turns up shredded through dumpling fillings, sliced into ramen and hot pot, and dried and ground into the umami seasoning powders sold as flavour boosters. Polyol tolerance varies a lot between people, so this is a food to retest after a successful mannitol challenge rather than write off for good.
Gut-friendly ways to eat mushroom (shiitake)
Replacing shiitake means replacing savoury depth, not texture. Oyster mushrooms are rated green in this guide and come closest to a like-for-like, holding their own in a stir-fry or a braise. Where the shiitake was doing umami work, soy sauce, tomato paste and a parmesan rind dropped into the pot all read as depth and are rated green here. For a broth, start from a low FODMAP stock and finish it with soy, ginger and a little mirin instead of a mushroom base.
Frequently asked questions
Can I eat shiitake mushrooms with IBS?
Not during elimination. The only serve measured is one small dried mushroom, and it is rated red on mannitol, so there is no small portion the data can vouch for. Polyols are absorbed poorly and draw water into the bowel, which is why they are a common cause of bloating, wind and urgency. If a mannitol challenge later goes well, a little shiitake may suit you.
Are fresh shiitake mushrooms better than dried?
The measured point is a dried mushroom, so fresh shiitake is not covered by these numbers and should not be assumed to be lower. What can be said is that the two are not interchangeable by weight: dried caps weigh a fraction of what they weigh after soaking, so 10 g of dried mushroom is a great deal more mushroom than it sounds on the packet.
What can I use instead of shiitake mushrooms?
Oyster mushrooms are the green-rated mushroom in this guide and slot into most recipes that call for shiitake. Button mushrooms are not the answer, since one small one already rates amber on the same polyol. Where the dish needs savoury weight rather than mushroom specifically, soy sauce, tomato paste or a hard cheese gets you most of the way there.
Is shiitake dashi or mushroom broth low FODMAP?
No, and the liquid is the riskier half. Because mannitol is water-soluble, a stock made by soaking dried caps carries it into the broth, while the mushrooms you fish out look like the part you avoided. The same goes for mushroom stock cubes and powders. Build the base without mushrooms and add the savoury note some other way.
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