Are potatoes low FODMAP?

By DietTribe · Updated 20 July 2026 · How we source our data

Yes — white potato is low FODMAP at any reasonable serving size. But sweet potato is a different story: it's a different plant entirely, and becomes moderate-to-high FODMAP well within a normal serving.

Potato: one of the safest starches

Regular white/brushed potato doesn't carry meaningful FODMAP content at typical serving sizes — raw, boiled, roasted, or mashed. It's a reliable base for a low FODMAP meal, and one of the easier substitutions for grain-based sides during an elimination phase.

The mix-up to avoid: sweet potato

Despite the similar name, sweet potato (kumara) is botanically unrelated to potato, and its FODMAP profile is genuinely different. It contains mannitol, one of the six FODMAP subtypes, and Monash's testing shows the FODMAP load climbing quickly with serving size — a small serve (roughly half a cup) sits at moderate, and a normal dinner-plate serve (around a cup) is high. This is a common mix-up: people assume "potato" and "sweet potato" are interchangeable for FODMAP purposes because they sound alike, and they're not.

What actually causes problems in potato dishes

  • Garlic and onion in roast potatoes or hash browns — very common, and the more likely culprit than the potato
  • Sour cream, butter, or cheese toppings in larger amounts (lactose)
  • Pre-made wedges or fries with garlic/onion seasoning blends

For more on which starchy vegetables are safe and which aren't, see our low FODMAP food list guide.

Frequently asked questions

Are potatoes low FODMAP?

Yes — white/regular potato is rated low FODMAP at any reasonable serving size, raw, boiled, roasted, or mashed. It's one of the safest starchy vegetables on the diet.

Is sweet potato the same as potato for FODMAP purposes?

No — sweet potato is a completely different plant, and it behaves differently. Monash rates a small serve of sweet potato (around half a cup) as moderate, and a normal-sized serve (around a cup) as high FODMAP, due to its mannitol content. Don't assume sweet potato is interchangeable with potato just because the name is similar.

What about potato skins, chips, and mash?

The potato itself stays low FODMAP across these preparations. What changes the picture is added ingredients — sour cream and butter (lactose in larger amounts), garlic in roast potatoes, or onion in hash browns — not the potato.

Medical & accuracy disclaimer: DietTribe provides general information, not medical advice. FODMAP tolerance is highly individual and IBS is a medical condition — talk to your doctor or dietitian before starting an elimination diet. Internet FODMAP ratings (including ours) are not a substitute for Monash University's lab-tested data, and product formulations change — always check the ingredient list on the physical package and confirm with the manufacturer if unsure.

More guides

🥦

What is FODMAP?

FODMAP explained without the jargon — what the acronym means, why these carbohydrates trigger IBS symptoms, and how the low FODMAP diet actually works as an elimination-and-reintroduction process.

Read guide →
📋

Low FODMAP food list

A starting-point low FODMAP food list organised by food group, why "internet FODMAP lists" (including this one) are never a substitute for Monash's lab-tested app, and how to use our product filters alongside it.

Read guide →
🩺

The FODMAP diet for IBS

How the low FODMAP diet is actually used to manage IBS: the three phases, why it is meant to be temporary, and where SIBO fits in — plus the NZ resources dietitians point patients to.

Read guide →