Lettuce

Low FODMAP

Tested serving

1 cup shredded (55g) Low

Lettuce is Low FODMAP at 1 cup shredded (55g), making it one of the easiest greens to build a meal around.

At the tested serving of 1 cup shredded (55g), lettuce shows no elevated FODMAP subgroups, so it sits comfortably in the low range with a very light overall load.
Lettuce is mostly water and fiber, which is part of why it tends to be so gentle, and it works as a crisp base for salads, wraps, and sandwiches without adding to your FODMAP total.

Use it freely as a fresh, crunchy foundation and layer on other low-FODMAP favorites to round out your plate.

Why lettuce is rated low

Lettuce comes in low at the one serving that has been tested, 1 cup shredded (55g), and the record shows no raised FODMAP subgroup for it, so there is no single carbohydrate group setting the limit here. That is the whole of the published serving data for lettuce: one rung, tested low. Amounts larger than 1 cup shredded (55g) have not been measured, so the honest answer is that the low rating belongs to that serving rather than to lettuce in any quantity, and in practice what tips a salad from comfortable to uncomfortable is usually everything else in the bowl rather than the leaves.

What changes your risk

Serving size The published data covers 1 cup shredded (55g) and nothing beyond it, so treat that as the tested amount rather than assuming a piled bowl behaves the same way.
The dressing This is where most lettuce trouble starts. Creamy dressings, caesar, ranch and vinaigrettes built on a stock base very often contain onion, garlic, or onion and garlic powder. Fructans are water soluble and do not dissolve into oil, so garlic infused oil with vinegar gives you the flavour without them, as long as no solid garlic is sitting in the bottle.
The rest of the plate A low rating is per serving, not per meal. Lettuce carries no raised subgroup of its own, but a salad stacked with several vegetables, a dressing, croutons and a topping adds up to one combined FODMAP load eaten in one sitting, and that total is what a sensitive gut meets.
Bagged salad mixes A bag sold as salad is rarely only lettuce. Mixes carry other leaves, and kits add dressing sachets, croutons and crunchy toppings that are their own ingredients with their own labels worth reading.
Wilting and braising Heat does not destroy FODMAPs, so cooked lettuce is not a lower FODMAP lettuce. What cooking does change is volume: leaves collapse, so a cooked pile can easily have started as far more than the tested serving. Measure while it is still crisp.

What else works

Lettuce is genuinely one of the easier salad bases, and it sits alongside other low choices that fill the same crunchy, bulky role: cucumber, baby spinach, carrot, bell pepper, green beans and bok choy all work in a bowl or a wrap. The lookalikes worth separating out are the bitter chicory family leaves such as radicchio, which are tested on their own terms and have their own, tighter serving data rather than inheriting lettuce's. Dressings and toppings are the real risk: skip anything built on onion or garlic, and skip salad toppers or fibre boosters made with inulin or chicory root fibre, which are not a lettuce problem but will quickly become a meal problem.

How to keep it low

Buy whole heads rather than kits where you can, since a head is just lettuce and a kit is a list of ingredients. Wash and dry the leaves properly, then store them loosely in a container with a dry paper towel to soak up moisture so they stay crisp for the week. Shred and measure the leaves into the bowl first, before anything else goes in, so the serving is set while you can still see it. For dressing, keep a bottle of garlic infused oil and a good vinegar within reach and whisk them together rather than reaching for a jar. When you are eating out, ask for the dressing on the side and for the salad plain, which also lets you leave off the croutons and the crunchy onion pieces that often arrive scattered across the top.

Common questions

how much lettuce is low fodmap

The tested serving is 1 cup shredded (55g), and it comes in low. Larger amounts have not been tested, so that serving is what the low rating is based on.

can i eat lettuce during the elimination phase

Yes, lettuce is low at 1 cup shredded (55g), which makes it one of the more straightforward salad bases during the strict phase. The thing to watch is the dressing and the toppings rather than the leaves.

is romaine or iceberg lettuce different

The published serving data records lettuce as a single entry at 1 cup shredded (55g), without separate figures by variety, so there is no basis here for rating one type against another. What reliably differs between salads is what goes on top of them.

why does my salad bother me if lettuce is low fodmap

Usually because of what is with it. Dressings, croutons and seasoning blends frequently contain onion and garlic, and several low servings eaten together in one bowl still add up to one combined load for that meal.

Learn more

Informational only, not medical advice. Individual tolerance varies. Talk to a healthcare professional or a dietitian for personal guidance.

References

Fructan and free fructose content of common Australian vegetables and fruit. Muir et al. (2007), J. Agricultural and Food Chemistry 55(16):6619-6627.
Measurement of short-chain carbohydrates in common Australian vegetables and fruits by HPLC. Muir et al. (2009), J. Agricultural and Food Chemistry 57(2):554-565.
Quantification of fructans, galacto-oligosaccharides and other short-chain carbohydrates in processed grains and cereals. Biesiekierski et al. (2011), J. Human Nutrition and Dietetics 24(2):154-176.
Dietary sorbitol and mannitol: food content and distinct absorption patterns. Yao et al. (2014), J. Human Nutrition and Dietetics 27(Suppl 2):263-275.
FODMAPs: food composition, defining cutoff values and international application. Varney et al. (2017), J. Gastroenterology and Hepatology 32(Suppl 1):53-61. Supplies the low, moderate and high cutoffs used on this page.