Plain potato chips and plain corn chips are both low FODMAP, making them safe staples for most people following the diet. The trouble starts with flavored varieties, where hidden ingredients like onion powder, garlic powder, and dairy solids can push a seemingly simple snack into high FODMAP territory. Knowing which base ingredients are safe and which seasonings to avoid lets you shop confidently.
Safe Base Ingredients
The simplest rule: if the chip is made from potato, corn, or cassava and seasoned with nothing but salt and oil, it’s almost certainly low FODMAP. Plain salted potato chips typically contain only potatoes, vegetable oil, and salt. Plain corn tortilla chips follow the same pattern with corn flour, oil, and salt. Many grain-free chips use cassava flour as their base, which is also low FODMAP.
Sweet potato chips are a bit more nuanced. Sweet potato is low FODMAP at a standard half-cup serving (about 75 grams), but once you go above 100 grams, you start hitting moderate levels of mannitol, a sugar alcohol that can trigger symptoms. Past 112 grams, the mannitol content is considered high. Since chip servings are usually well under 75 grams, sweet potato chips are generally fine, but mindless snacking straight from the bag could push you past the threshold.
Flavored Chips: Where Problems Hide
Flavored chips are the biggest minefield on a low FODMAP diet, and the issues come from two main sources: fructans and lactose.
Onion and garlic powder. These are the most common high FODMAP offenders in seasoned chips. Both are packed with fructans, and even small amounts in a seasoning blend can be enough to cause bloating, gas, or cramping. They show up in barbecue, sour cream and onion, ranch, salt and vinegar (sometimes), and most “bold” or savory flavors. Any chip listing onion powder or garlic powder in its ingredients is one to skip.
Dairy-based seasonings. Cheese, sour cream, and ranch-flavored chips almost always contain milk solids, whey, or other dairy derivatives that carry lactose. Nacho cheese flavors are particularly risky because they combine lactose-containing dairy with fructan-heavy seasonings like onion and garlic powder. If the packaging uses words like “creamy,” “cheese-flavored,” or “ranch,” expect dairy in the ingredient list.
Other red flags. High fructose corn syrup appears in some barbecue and honey-flavored chips and is high in excess fructose. The term “natural flavors” is vague enough to potentially hide fructan-containing ingredients. Wheat flour occasionally shows up as a coating or binder in certain flavored varieties. Any of these warrant a closer look at the full ingredient list before buying.
The Garlic-Infused Oil Exception
One detail surprises a lot of people new to the low FODMAP diet: garlic-infused oil is actually low FODMAP, even though garlic itself is not. The reason is chemistry. Fructans dissolve in water but not in fat. When garlic is steeped in oil, its flavor compounds transfer into the oil, but the fructans stay behind in the garlic solids, which are then strained out. So a chip fried or finished in garlic-infused oil can deliver garlic flavor without the FODMAP load. This is completely different from a chip dusted with garlic powder, where you’re eating the fructans directly. Check whether the label says “garlic-infused oil” versus “garlic powder” or “garlic seasoning.”
Brands Worth Knowing
A few brands carry official low FODMAP certification, meaning their products have been lab-tested and verified to fall within safe FODMAP thresholds. Fody is the most widely available in North America, offering certified snack options including chips and snack mixes formulated without onion or garlic. In Australia, Coles carries its own line of FODMAP Friendly-certified snacks, and Simply Wize offers certified options as well.
Beyond certified brands, plenty of mainstream chips are safe if you read labels. Store-brand plain salted potato chips, basic tortilla chips from any major brand, and simple kettle-cooked varieties with just potatoes, oil, and salt all work. The certification logo is a convenience, not a necessity. You can find safe chips in any grocery store by checking three things: no onion or garlic in any form, no dairy ingredients, and no high fructose corn syrup or honey.
How to Read a Chip Label Quickly
You don’t need to memorize every FODMAP. For chips specifically, scan the ingredient list for these terms:
- Onion powder, onion salt, or dehydrated onion in any amount
- Garlic powder, garlic salt, or dehydrated garlic in any amount
- Milk solids, whey, cheese powder, or buttermilk as flavoring agents
- High fructose corn syrup or honey as sweeteners
- “Natural flavors” without further specification (not always a problem, but worth caution during the elimination phase)
If none of those appear, the chips are almost certainly low FODMAP. Keep your serving size around 50 to 75 grams, which is roughly what fits in a small bowl, and you’ll stay well within safe limits for any low FODMAP base ingredient.