Traditional mayonnaise is low FODMAP. Its core ingredients, egg yolks, oil, and a small amount of acid like lemon juice or vinegar, contain no fermentable carbohydrates. That said, not every jar on the shelf is safe. Flavored varieties, light versions, and vegan options can contain hidden high FODMAP ingredients that turn a simple condiment into a gut trigger.
Why Basic Mayo Is Low FODMAP
FODMAPs are short-chain carbohydrates that ferment in the gut, and traditional mayonnaise simply doesn’t contain many carbohydrates at all. It’s mostly fat from oil, emulsified with egg yolk and stabilized with a splash of vinegar or lemon juice. None of those ingredients register on the FODMAP scale. A standard serving of one to two tablespoons is well within safe limits for the elimination phase of a low FODMAP diet.
This applies to most plain, full-fat store-bought mayonnaise. Brands like Hellmann’s (Best Foods) Real Mayonnaise, for example, use a straightforward formula of oil, eggs, vinegar, and salt. If the ingredient list is short and recognizable, you’re generally fine.
Ingredients That Make Some Mayo Risky
The trouble starts when manufacturers add flavoring, sweeteners, or thickeners. Here’s what to watch for on the label.
Garlic and Onion (Including Hidden Sources)
Garlic and onion are among the highest FODMAP foods, packed with fructans that trigger symptoms even in small amounts. Flavored mayonnaises, aioli, and “garlic mayo” obviously contain them, but the less obvious risk is the term “natural flavors” on a label. Under U.S. food labeling rules, onion powder, garlic powder, onion juice, and garlic juice can all be listed simply as “natural flavor” or “flavoring.” If you see that vague term on a mayo label, there’s no way to know whether garlic or onion is hiding inside. When in doubt, skip it or contact the manufacturer directly.
High Fructose Corn Syrup and Added Sugars
Excess fructose is a key FODMAP trigger, and high fructose corn syrup is one of the worst offenders. You’ll find it in products like Kraft Miracle Whip and certain budget mayonnaise brands. Light and vegan mayonnaises are particularly likely to contain added sugars, including high fructose corn syrup, to compensate for reduced fat or the absence of eggs. Always check the ingredient list for corn syrup, honey, or agave, all of which are high FODMAP.
Thickeners in Light and Low-Fat Versions
When fat is removed from mayonnaise, something has to replace the creamy texture. Light mayo often relies on modified food starch, gums, or other thickening agents. While some of these are FODMAP-safe, the reformulated products also tend to pack in more sweeteners and flavorings to make up for lost richness. Full-fat mayo is the simpler, safer choice on a low FODMAP diet. It has fewer additives and a shorter ingredient list.
Vegan Mayo Needs Extra Scrutiny
Vegan mayonnaise replaces eggs with plant-based emulsifiers, and this is where FODMAP problems multiply. Some homemade vegan mayo recipes call for soaked cashews, dates, or aquafaba (the liquid from canned chickpeas). All three are high FODMAP. Cashews are loaded with fructans and GOS, dates are high in fructose, and chickpea water carries enough GOS to cause symptoms in sensitive people.
Not all commercial vegan mayo is off-limits, though. Products built on simple ingredients like canola or sunflower oil with pea protein or soy lecithin as emulsifiers can be tolerable. Hellmann’s Vegan Mayonnaise, for instance, appears to be low FODMAP based on its listed ingredients. The key is reading the label carefully. If you see cashew, chickpea, inulin (chicory root fiber), honey, or garlic in any form, put it back.
Making Low FODMAP Mayo at Home
Homemade mayonnaise gives you complete control over what goes in. The Monash University FODMAP team publishes a recipe using just egg yolks, a pinch of sugar, salt, lemon juice or white wine vinegar, and one cup of neutral oil like grapeseed, rice bran, sunflower, canola, or light olive oil. You blend the yolks with the acid and seasonings, then slowly drizzle in oil while the food processor runs until it emulsifies into a thick, creamy mayo.
If you want garlic flavor without the FODMAPs, use garlic-infused oil. Fructans dissolve in water but not in fat, so oil that’s been steeped with garlic cloves (then strained) delivers the taste without the fermentable sugars. Monash’s low FODMAP aioli variation calls for a quarter cup of garlic-infused oil blended with three-quarters cup of plain oil. This ratio gives a noticeable garlic flavor without any FODMAP load.
Quick Label-Reading Checklist
- Safe ingredients: oil (any type), egg yolks, vinegar, lemon juice, salt, mustard, sugar in small amounts
- Caution ingredients: “natural flavors,” “spices” (can include onion or garlic), soy protein concentrate
- Avoid: garlic, onion (any form), high fructose corn syrup, honey, agave, inulin, chicory root fiber, cashew, chickpea
Plain, full-fat mayonnaise from a major brand with a short ingredient list is one of the easiest condiments to keep in your low FODMAP rotation. The risk comes from grabbing a flavored, light, or vegan version without reading the fine print. A 30-second label check is all it takes to keep your sandwich safe.