Tuna (fresh or canned)
Meat, Fish & Eggs · Fish Seafood
One drained can of tuna, 120 g, is rated green with nothing in any of the six FODMAP groups, and a fresh steak is the same food with the same result. The page you actually need is about the rest of the can. Broth-packed and flavoured tuna frequently list onion or garlic, and tuna mayo is usually built with celery and raw onion stirred through it.
Last updated 4 September 2026Serving sizes for tuna (fresh or canned)
The tested serve is one drained can, about 120 g, rated green.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1 can drained | 120 g | None detected |
Breakdown for 1 can
Is tuna (fresh or canned) low FODMAP?
Springwater, brine and oil all leave the rating alone, because none of them contains a fermentable carbohydrate. Vegetable broth does not leave it alone. A can packed in broth is packed in an onion and garlic base, thinned but not removed, and draining pours off some liquid rather than what has soaked into the fish. The flavoured range is more obvious once you start looking: onion and tomato, sweet chilli, lemon and cracked pepper and mayonnaise-blended cans all carry seasoning, and several name onion powder outright.
Tuna (fresh or canned) and IBS: what to know
Tuna mayo is how most people actually eat this fish, and the standard recipe has two problems, neither of them the tuna. Mayonnaise is rated green, so that part is fine. Celery is not straightforward: a 10 g piece is green, but a whole 50 g stalk is rated red on 0.4 g of mannitol, and a sandwich filling normally takes a stalk or two. Finely chopped onion is the other habitual addition, and a single tablespoon of it is already a red serve.
Gut-friendly ways to eat tuna (fresh or canned)
Build the filling differently and nothing is really lost. Cucumber and the green tops of spring onions supply the crunch and the bite that celery and onion were there for, with lemon juice, black pepper and a little Dijon for lift. Buy tuna in springwater or olive oil and check that the ingredient list runs to three items. Tuna nigiri is rated green if you are eating out, while a spicy tuna roll is amber, since the sauce brings more than chilli with it.
Frequently asked questions
Is canned tuna low FODMAP?
Plain canned tuna is, and the tested can comes back with every group at zero once drained. The word to look for on a label is broth, since tuna packed in vegetable broth carries an onion and garlic base, and the flavoured cans list their seasonings openly enough if you turn them over. Tuna in springwater, or in olive oil with nothing else added, is the version that needs no thought.
Is tuna mayo low FODMAP?
It can be, but not the way sandwich shops make it. The mayonnaise is rated green, so that is not where the trouble comes from; the celery and the raw onion mixed through it are. Made at home with cucumber, chives or spring onion greens and a squeeze of lemon, tuna mayo becomes a dependable low FODMAP lunch. Bought sandwiches and jarred fillings need their ingredient lists checked.
Is tuna in oil or springwater better for IBS?
Neither adds a FODMAP, so the choice comes down to fat and taste rather than fermentation. Oil-packed tuna is richer, which matters only if a lot of fat at once tends to set you off. Springwater is the leaner option and takes a dressing better. Whichever you buy, drain it and read the label, because the packing medium is exactly where broth and flavourings turn up.
Is fresh or seared tuna low FODMAP?
Yes, and it does not differ from the canned entry, which covers fresh and canned tuna together at 120 g. A steak seared with sesame seeds, soy sauce and ginger is a straightforward low FODMAP dinner. The marinade or crust is the thing to watch, since teriyaki, sweet chilli and most bought glazes bring garlic, onion or a high fructose sweetener along with the flavour.
Check a whole plate in seconds.
Not sure about a whole meal? Scan it with the Gut Friendly app.
Get the app
