Is lettuce low FODMAP?

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

Yes — lettuce is low FODMAP across every common variety, at typical salad serving sizes. It's one of the easiest, lowest-risk vegetables to build a meal around on a low FODMAP diet.

Why lettuce is such a safe bet

Lettuce has a very low carbohydrate content overall, which means there simply isn't much FODMAP-relevant material in it to accumulate — even in a generous serve. This applies across the common varieties sold in New Zealand: iceberg, cos (romaine), butter lettuce, and oak leaf all sit comfortably in the low FODMAP range.

What to watch instead

If a salad causes symptoms, the lettuce is very unlikely to be the cause. The more common culprits in a typical salad are:

  • Garlic and onion in dressings — two of the most concentrated fructan sources in any diet
  • Croutons or other wheat-based additions
  • Larger amounts of other vegetables in the same bowl (avocado, for example — see our is avocado low FODMAP guide)
  • Creamy dressings made with milk or soft cheese (lactose)

For the wider picture on which vegetables are reliably low FODMAP, see our low FODMAP food list guide.

Frequently asked questions

Is all lettuce low FODMAP?

The common varieties — iceberg, cos/romaine, butter lettuce, oak leaf — are all rated low FODMAP by Monash University at typical salad serving sizes. There's no major variety to single out as a risk here, unlike some other salad vegetables.

Does a big serve of lettuce change anything?

Lettuce's very low carbohydrate content means it stays low FODMAP even at generous serving sizes — it's not one of the foods where quantity is the deciding factor.

What salad vegetables should I actually watch out for?

Not lettuce — but garlic and onion in dressings, and larger amounts of some other vegetables, are the more common salad-related FODMAP triggers. See our low FODMAP food list guide for the fuller picture.

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.

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