Green Bean

Low FODMAP

Serving sizes

Green Bean changes rating with portion size. These are the amounts tested in the literature behind our ratings.

1 cup (75g) Low
2 cups (150g) Moderate

Green beans are Low FODMAP at a generous 1 cup (75g), making them one of the easier vegetables to enjoy.

At a small serving, green beans carry no elevated FODMAP subgroups, so they sit comfortably in the low range and are gentle on most sensitive tummies.
As the portion grows, the overall FODMAP load climbs into moderate territory, so it is the total amount on your plate rather than any single subgroup that matters here.

Keep to around 1 cup (75g) and enjoy them steamed, roasted, or tossed into a stir-fry as a reliable green side.

Why green bean is rated low

Green beans are low at 1 cup (75g), with no FODMAP subgroup recorded for them at that serving, which is why they are a dependable green side on a low FODMAP plate. They are eaten as an immature pod rather than as a dried mature bean, and that is exactly why they behave so differently from the beans in the pantry. The ladder does have a second rung: at 2 cups (150g) they come in moderate, so a big bowl of beans as the main vegetable adds enough overall load to notice. One cup alongside the meal is the sweet spot, and the second cup is the decision point.

What changes your risk

Serving size 1 cup (75g) is low and 2 cups (150g) is moderate. Doubling up is the most common way green beans stop being an easy option, so serve the cup and fill out the plate with something else.
Drain and rinse the canned ones Water soluble FODMAPs leach out of vegetables into the canning liquid, so canned green beans should be tipped into a sieve, the liquid poured away, and the beans rinsed under cold running water for thirty seconds or so before they go in the pan. Never cook them in the liquid from the can.
Boil and pour the water away If you are cooking from fresh or frozen, boiling in plenty of water and draining it off takes some water soluble FODMAPs with it. Steaming, roasting, microwaving and stir frying do not, because nothing leaves the food.
Hidden onion and garlic Green bean casserole is the classic trap, built on fried onions and a condensed soup base. Beans almondine, bean salads with a shallot dressing and restaurant sides tossed in a garlic butter are all carrying fructans the beans themselves do not. Garlic infused oil, chives and the green tops of spring onions cover the same flavour.
Stacking in one meal A low serving counts per serving, not per meal. A cup of green beans next to several other vegetable sides builds the meal's total FODMAP load even when each item is low on its own, and spreading servings across the day is easier to manage.

What else works

Green beans are low at their tested serving, so what matters most is not confusing them with their pantry relatives. The mature legumes people lump in with them, including chickpeas, lentils, kidney beans, baked beans, soy beans and broad beans, are separate foods and are high at ordinary servings, so a bigger scoop of any of those is not a way to get more beans on the plate. For a second green vegetable that keeps the total down, bok choy, baby spinach, zucchini, bell pepper, carrots and cucumber all sit low, and potato, rice, polenta or quinoa fill out the meal underneath. If you want the crunch and colour without doubling the beans, a mixed plate of green beans and bell pepper does more for the total than two cups of beans.

How to keep it low

Buy beans that snap cleanly rather than bending, because limp ones get cooked longer and end up drowned in sauce. Top and tail a cup at a time rather than a whole bag, so the portion is decided at the chopping board. Frozen green beans are genuinely convenient here since you can measure the cup straight from the bag. With canned beans, open the tin, drain it fully, rinse the beans under cold running water and drain again before they touch the pan. Blanch fresh beans in a big pot of salted water, pour the water away, then finish them in a hot pan with garlic infused oil, lemon zest, salt and flaked almonds. Ordering out, ask for green beans plain or with oil and lemon, and skip anything described as casserole, almondine with a shallot dressing, or tossed in garlic butter.

Common questions

how many green beans can i eat on the low fodmap diet

1 cup (75g) is the tested low serving. At 2 cups (150g) green beans come in moderate, so one cup alongside the meal is where to keep them.

are canned green beans ok

Yes, when you drain the liquid away and rinse the beans under cold running water before cooking. Water soluble FODMAPs leach into the canning liquid, so tipping that liquid into the pan defeats the point.

are green beans the same as other beans on this diet

No. Green beans are eaten as an immature pod and are low at 1 cup (75g). Dried and canned mature beans such as chickpeas, lentils, kidney beans and baked beans are separate foods that are high at ordinary servings.

why does green bean casserole set me off

Green bean casserole is built on fried onions and a soup base, both of which carry fructans. The beans in it are not the issue, the onion is.

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.

Last reviewed September 22, 2026.