Plain potatoes are a low FODMAP food, so potato salad can absolutely work on a low FODMAP diet. The catch is everything else in the bowl. Traditional recipes are loaded with onion, garlic, and sometimes sour cream, all of which are high in FODMAPs and likely to trigger symptoms. With a few smart swaps, though, potato salad becomes one of the easier side dishes to keep in your rotation.
Why Potatoes Themselves Are Safe
Monash University, the research group behind the FODMAP diet, categorizes potatoes as a low FODMAP food. This applies to common white potatoes, red potatoes, and fingerlings. Potatoes are a starchy vegetable, not a significant source of the fermentable carbohydrates (the “F” in FODMAP) that cause trouble for people with IBS. A standard serving of one medium potato or roughly one cup of cubed potato is well within low FODMAP limits.
One thing worth knowing: when potatoes are cooked and then cooled, as they are in potato salad, some of the starch converts into what’s called resistant starch. This type of starch resists digestion in the small intestine and gets fermented by gut bacteria in the colon instead. For some people with IBS, that fermentation can increase gas or bloating. Most people tolerate normal portions of cold potato just fine, but if you notice symptoms specifically with cold potato dishes that you don’t get with hot potatoes, resistant starch may be the reason. Keeping your portion to about one cup is a reasonable starting point.
The Ingredients That Cause Problems
The real FODMAP risk in potato salad comes from the mix-ins and dressing. Here’s where traditional recipes go wrong:
- Onion and garlic. These are the biggest offenders. Both are extremely high in fructans, a type of FODMAP that ferments rapidly in the gut. Even small amounts of raw onion or garlic powder can trigger symptoms in sensitive people. Most classic potato salad recipes call for a generous amount of diced onion.
- Sour cream. Many creamy potato salads use sour cream as a base or mix it with mayonnaise. Sour cream contains lactose, which makes it a high FODMAP ingredient. If your recipe calls for it, you’ll need to find an alternative.
- Celery. Celery is low FODMAP only at small servings, around a quarter of a stalk. The generous celery chunks in many recipes can push you past the safe threshold.
Safe Swaps for a Low FODMAP Version
Building a low FODMAP potato salad is mostly about replacing onion and garlic with ingredients that deliver flavor without the fructans.
For onion flavor, use the green tops of spring onions (scallions) or chives. The white bulb of a spring onion is high in FODMAPs, but the green part is not. Chop the green parts finely and you’ll get that fresh, savory bite without the digestive consequences. For garlic flavor, garlic chives are an herb with a distinctly garlicky taste that works well. Another popular option is garlic-infused oil: fructans dissolve in water but not in fat, so oil that’s been infused with garlic and then strained carries the flavor without the FODMAPs.
For the dressing base, plain unsweetened mayonnaise is your friend. It’s low FODMAP in standard amounts (about a teaspoon per serving, though most people tolerate a tablespoon without issue since commercial mayo contains very little lactose or fructans). Skip the sour cream entirely, or substitute a lactose-free sour cream if you want that tangy element. Dijon mustard and apple cider vinegar are both safe additions. A dressing made from two tablespoons of apple cider vinegar and one tablespoon of Dijon mustard, whisked into your mayo, gives you a sharp, flavorful base that’s entirely low FODMAP.
Add-Ins That Work
Pickled gherkins (the small, tart pickles common in potato salad) are low FODMAP in a standard serving. Monash has confirmed that fermented pickled gherkins are safe, making them a great way to add crunch and acidity. Just check the ingredient label for added garlic or onion in the brine, which some brands include.
Hard-boiled eggs are FODMAP-free and add protein and richness. Fresh dill, parsley, and paprika are all safe herbs and spices that round out the flavor. A small amount of celery (keep it to a few thin slices per serving rather than big chunks) adds crunch without crossing the FODMAP threshold. Capers, black olives, and a squeeze of lemon juice are other options that stay well within safe limits.
Putting It Together
A solid low FODMAP potato salad looks like this: cubed boiled potatoes (cooled), tossed with mayonnaise, a splash of apple cider vinegar, Dijon mustard, chopped green scallion tops, diced gherkins, sliced hard-boiled eggs, and fresh dill. Season with salt, pepper, and a pinch of paprika. That combination gives you the creamy, tangy, savory profile of a classic potato salad without any high FODMAP ingredients.
If you’re bringing potato salad to a gathering or ordering it at a deli, the safest assumption is that it contains onion and possibly garlic. Restaurant and store-bought versions almost always do. Making it at home gives you full control, and it’s one of the simplest dishes to adapt since the base ingredient is already safe. The only real work is swapping out a few things you’re probably already avoiding.