Corn

Why corn is rated low

Corn comes in low at the tested serving of 1 ear (85g), and no FODMAP subgroup is recorded for it at that amount, so a single cob alongside a meal sits comfortably in the low range. The catch is how little room there is above it. The next rung tested, 1⅓ ears (112g), is already high, so the difference between a safe plate and a heavy one is barely more than a third of a cob. Corn is a food where the low rating is genuinely tied to the portion in front of you rather than to the food itself, and treating it as unlimited because it is a vegetable is how people get caught out.

What changes your risk

• Serving size The ladder is unusually tight. 1 ear (85g) is low and 1⅓ ears (112g) is high, so going back for a second cob, or picking the biggest one on the tray, is the single thing most likely to push corn over.
• Stacking in one meal A low serving is per serving, not per meal. Corn on the cob next to a corn salsa, corn bread and a corn based side adds the whole day's FODMAP load into one sitting, and the total is what your gut responds to. Spreading servings across the day is easier to manage than stacking them.
• Hidden onion and garlic Most of the trouble with corn is what comes with it. Creamed corn, corn chowder, corn relish, elote style toppings and seasoned corn butters are usually built on onion, garlic or a stock that contains both. Garlic infused oil gives the same savoury edge without the fructans, as long as no solid pieces are left in the oil.
• Other corn foods are not this food The tested serving describes corn on the cob. Corn chips, popcorn, corn flour and corn based cereals are separate entries with their own servings, and high fructose corn syrup is not a low FODMAP sweetener at all. A low rating for the cob does not carry across to the aisle.
• Cooking does not lower it Boiling, grilling, roasting or freezing corn does not break FODMAPs down. Charred kernels off the grill and kernels out of the freezer carry the same load as the cob you started with, so the portion still has to be counted.

What else works

Corn is low at its tested serving, so it does not need replacing, but it does need company that is also low. Carrots, zucchini, green beans, bell pepper, cucumber, bok choy and baby spinach round out a plate without adding to the total, and potato, rice, polenta or quinoa work if you want the starchy side that corn usually plays. The lookalikes to watch are the processed corn foods people assume inherit the rating: creamed corn and corn relish are usually made with onion, corn chowder almost always starts with onion and garlic, and high fructose corn syrup belongs nowhere near a low FODMAP swap list. Baby corn is a separate food with its own serving data and should not be treated as the same thing.

How to keep it low

Buy corn by the single cob rather than the bagged bundle, because a cob you pick yourself is easier to keep to one. At a barbecue or a taco stand, take one ear and fill the rest of the plate with plain meat, rice or a salad instead of going back for a second. Frozen kernels are handy because you can measure what goes into a stir fry rather than tipping the bag in, and they save the cob for a day when corn is the point of the meal. When you are ordering, ask what the corn is dressed with: a plain grilled cob with butter is straightforward, while anything described as creamed, chowder, relish or street style is usually carrying onion and garlic. If you are cooking, brush with garlic infused oil and finish with chives or the green tops of spring onions for the savoury note without the load.

Common questions

how much corn is low fodmap

1 ear (85g) is the tested low serving. The next tested amount, 1⅓ ears (112g), is high, so a second cob or an oversized one moves you out of the low range quickly.

can i eat corn on the elimination phase

Yes, at 1 ear (85g), which is the serving the published data records as low. Larger helpings are not suitable during elimination, and tolerance is individual, so reintroduction is best worked through with a dietitian.

is corn on the cob the same as corn chips or popcorn

No. The 1 ear (85g) serving applies to corn on the cob only. Corn chips, popcorn and corn flour are separate foods with their own tested servings, and high fructose corn syrup is not low FODMAP.

why does creamed corn bother me when plain corn is fine

Creamed corn, corn chowder and corn relish are usually made with onion, garlic or a stock containing both, which adds fructans that plain corn does not carry. The corn is rarely the problem in those dishes.