Corn (sweet corn)
Vegetables · Other Vegetables
Corn is green at a quarter cup of kernels (38 g) and red at half a cob (75 g), which is where people go wrong: a quarter cup is a spoonful stirred through a salad, not a side dish, and half a cob is not how anyone eats corn on the cob. The safe serve is far smaller than the shape of the food suggests.
Last updated 3 September 2026Serving sizes for corn (sweet corn)
Green at ¼ cup of kernels (38 g). Half a cob (75 g) is rated red.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1/4 cup kernels | 38 g | GOS 0.1 g | |
| 1/2 cob | 75 g | GOS 0.2 g |
Breakdown for 38 g
Is corn (sweet corn) low FODMAP?
Corn is unusual in that no single FODMAP group is doing the damage. Going from the quarter cup to the half cob, GOS doubles to 0.2 g and clears the 0.1 g moderate line, sorbitol climbs to 0.16 g and fructans reach 0.1 g. Nothing there is extreme on its own; the red rating comes from three groups rising together in the same mouthful. Sorbitol is the one worth remembering, because it is a polyol that nobody absorbs efficiently, and it is the same group that limits stone fruit and sugar-free gum.
Corn (sweet corn) and IBS: what to know
Two different complaints get blamed on corn. The first is the fermentable load described above. The second is the kernel hull, which is cellulose that humans have no enzyme for, so whole kernels often come out looking much as they went in. That is entirely normal and says nothing about your gut. On the FODMAP side, sorbitol is dose-dependent and it accumulates across a day, so a spoonful of corn in a salad that also holds avocado, followed by a stone-fruit dessert, can add up even when each item sits inside its own serve.
Gut-friendly ways to eat corn (sweet corn)
Treat corn as a garnish rather than a vegetable side, and it earns its place: a quarter cup through a salad, a salsa, a fritter batter or a soup brings plenty of sweetness for the space it takes. If you want corn in real volume, the processed forms are the way in. Corn tortillas, polenta and plain popcorn are each rated green at their own tested serves. With canned corn, drain and rinse it, since GOS dissolves in water and some leaves with the brine.
Frequently asked questions
Can I eat corn on the cob with IBS?
Half a cob is already rated red, so a whole cob sits well beyond a safe serve for most people. The workable version is to cut a quarter cup of kernels off the cob and eat those as part of a bigger plate. If corn on the cob is a summer ritual you will not give up, keep it to a short section and see how you go.
Is popcorn low FODMAP?
Plain popcorn is rated green at its own tested serve, and it is genuinely a different food from the kernels on this page. Popcorn is made from a hard, dried corn rather than sweet corn, so the sugars and polyols that push a half cob into the red are not the issue. The butter and flavourings on some bags are a separate question.
Are corn tortillas and corn chips low FODMAP?
Both are rated green in the guide at their tested serves, which makes them a far more forgiving way to eat corn than kernels are. They are made from dried, milled corn rather than fresh sweet corn. Where they trip people up is the seasoning: flavoured chips often carry onion and garlic powder, so plain salted versions are the safer buy.
Why does corn give me gas and bloating?
Two of its FODMAP groups explain most of it. GOS is not absorbed by anyone and is fermented by gut bacteria, which produces gas, while sorbitol pulls water into the bowel and adds to the pressure. At a spoonful the amounts are small enough to pass unnoticed; at a cob they arrive together, which is why the serving size matters more here than the cooking method.
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