Are Mayo, Ketchup, and Mustard Low FODMAP?

Ketchup, yellow mustard, and Dijon mustard bottles beside the words Low FODMAP?

Quick answer: Plain, regular mayonnaise, yellow mustard, and Dijon mustard are usually the most straightforward low FODMAP choices. Ketchup depends more on the formula and how much you use. The exact bottle still decides the answer, so check the ingredient list and confirm the serving before adding it to your burger, fries, or sandwich.

Plain, regular mayonnaise: Usually yes

Check flavored mayo and aioli for garlic or onion. Review reduced-fat and vegan mayo as separate formulas.

Ketchup: It depends

Check the ingredients and serving. Garlic, onion, concentrated fruit ingredients, added fibers, and sweeteners can change the answer.

Plain yellow mustard: Usually yes

Check honey mustard, sweet mustard, and flavored versions separately.

Plain Dijon mustard: Usually yes

Check the exact jar for garlic, onion, honey, or added flavorings.

Is mayonnaise low FODMAP?

Plain, regular mayonnaise is usually a straightforward choice. Its familiar base is egg yolk, oil, and vinegar or lemon juice, but commercial recipes can include other ingredients. That is why the answer applies to plain mayo, not every creamy spread sitting beside it.

Give aioli and flavored mayo a fresh label check, especially garlic, herb, chipotle, and truffle versions. Look for garlic, garlic powder, onion, and onion powder, and compare the rest of the formula with the plain version. Reduced-fat mayonnaise can use a different formula from regular mayo, and vegan mayo replaces the egg-based formula. Check those products on their own instead of borrowing the answer from plain, regular mayonnaise.

Is ketchup low FODMAP?

It depends. Ketchup deserves the closest look because both the recipe and serving matter. Scan for garlic, onion, concentrated fruit ingredients, chicory root, inulin, other added fibers, and sweeteners. Then confirm the serving for the closest matching ketchup entry in the current Monash FODMAP app.

High-fructose corn syrup is not an automatic rejection, and table sugar does not settle the question either. The full formula and the amount of ketchup still matter.

An ingredient list helps you screen a bottle, but it cannot show the measured FODMAP content of the finished ketchup. When the formula is hard to assess, current app guidance or recognized low FODMAP certification gives you stronger product-level information.

Are yellow mustard and Dijon low FODMAP?

Plain yellow mustard is usually a straightforward choice. Plain Dijon usually is too. Still, read the exact jar because "yellow" and "Dijon" describe styles, not one fixed recipe.

Honey mustard and sweet mustard need separate checks because their sweeteners and proportions vary. Garlic mustard, onion mustard, and flavored varieties are also different formulas. Look for garlic, onion, honey, and added flavorings, then confirm the serving if the label or style has changed.

What to look for on a condiment label

Use this quick check in the U.S. condiment aisle:

Match the exact formula. Regular, reduced-fat, vegan, flavored, and sweetened versions are different products, even when the brand name is the same.

Look for garlic and onion. Under U.S. labeling rules, garlic powder and onion powder must be named rather than folded into "spice." "Natural flavor" is neutral information: it can come from vegetable sources, but the term alone does not prove that garlic or onion is present.

Check the additions that matter for that bottle. For ketchup, pay attention to concentrated fruit ingredients, chicory root, inulin, added fibers, and sweeteners. For mayo and mustard, flavored versions deserve their own review.

Confirm the serving. Check the closest matching entry in the current Monash FODMAP app rather than treating the whole condiment category as one food.

Use recognized certification when you want finished-product evidence. Certification involves testing the complete product at its approved serving. Our guide to what Monash Certified Low FODMAP means explains that distinction in more detail.

Before you buy, turn over the bottle, match the exact formula, and check the serving you actually plan to use.