Lettuce (Iceberg)
Vegetables · Leafy Greens
A cup of shredded iceberg, 75 g, is rated green, and the only reading behind it is 0.01 g of fructans. Lettuce is water held in a crisp structure, and water does not ferment. If salads have been giving you trouble, the leaves are almost never the reason: the dressing, the raw onion and whatever was scattered over the top are.
Last updated 4 September 2026Serving sizes for lettuce (iceberg)
One cup shredded (75 g) is rated green. Romaine, butter and unspecified lettuce are listed separately and rate green too.
Tested serving sizes
| Serving | Amount | Main FODMAP | Rating |
|---|---|---|---|
| 1 cup shredded | 75 g | Fructans 0.01 g |
Breakdown for 1 cup
Is lettuce (iceberg) low FODMAP?
There is barely anything in the leaf to explain. The measured cup carries 0.01 g of fructans, a tenth of the level at which fructans start to count, and excess fructose, lactose, GOS, sorbitol and mannitol all read zero. Several lettuces have their own pages in this guide, romaine, butter lettuce and a general lettuce entry among them, and every one is green, so the choice between them comes down to crunch, flavour and how long a head lasts in the fridge.
Lettuce (Iceberg) and IBS: what to know
Salad has a reputation with IBS that the lettuce never earned. Look at what actually goes into a café bowl: raw onion, where one chopped tablespoon already holds 0.4 g of fructans and rates red; a creamy dressing built on garlic; croutons; dried fruit; half an avocado, which is rated red at that amount on sorbitol. Any one of those brings more to the bowl than an entire head of iceberg. The other honest explanation is volume, since a large raw salad delivers a lot of insoluble fibre in one sitting, and that can feel rough whatever the rating says.
Gut-friendly ways to eat lettuce (iceberg)
Build the bowl, then look hard at what you are about to pour over it. Oil with lemon or vinegar, salt and chopped herbs is the safest dressing going, and mayonnaise holds up at normal amounts where a bottled ranch or caesar will not. For colour and bulk, cucumber, cherry tomatoes, grated carrot and sliced radish all sit inside their own green serves. Iceberg’s real talent is structural: those cupped leaves hold a burger filling or taco mince together without tearing, which is why a lettuce wrap works when bread is the thing you are avoiding.
Frequently asked questions
Why does salad give me bloating if lettuce is low FODMAP?
Usually because of everything else in the bowl. Raw onion, garlic-based dressings, croutons, apple, dried cranberries and a generous scoop of avocado each carry a real load, while the leaves underneath barely register at all. The second explanation is sheer volume of raw fibre, and that one responds to a smaller bowl or a warm meal rather than to swapping one lettuce for another.
How much iceberg lettuce can I eat at once?
One cup shredded is the tested amount and it is rated green. Nothing above it has been measured, though the reading at a cup is close enough to empty that lettuce is rarely the ingredient worth rationing. A side salad is several cups, so if a big raw bowl consistently bothers you, treat that as a fibre and volume question rather than a portion limit.
Which lettuce is best on a low FODMAP diet?
They behave the same way, so choose on texture. Iceberg is the crunchiest and by far the best at holding a wrap together, romaine has more flavour and stands up to a thick dressing, and butter lettuce is soft and suits a delicate plate. Bagged mixes are the ones to check, since they often carry rocket, spinach and herbs, and salad kits come with a dressing sachet attached.
What dressing can I use on a low FODMAP salad?
Start with olive oil and an acid: lemon juice, red wine vinegar or balsamic all work, lifted with dijon mustard, black pepper and herbs. Garlic-infused oil gives you the garlic note without the fructans, which do not dissolve into oil. Bought dressings are where onion and garlic powder hide, and the creamy ones are usually the worst of them on a label.
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