White beans are high in FODMAPs at typical serving sizes, but small portions can still fit into a low FODMAP diet. The key factors are the type of white bean, how it’s prepared, and how much you eat in one sitting.
Why White Beans Are High FODMAP
White beans, like most legumes, are naturally rich in two types of fermentable carbohydrates: galacto-oligosaccharides (GOS) and fructans. These are short-chain carbohydrates that your small intestine can’t fully break down. Instead, they travel to your large intestine where gut bacteria ferment them rapidly, producing gas and drawing water into the bowel. For people with IBS or similar digestive sensitivities, this fermentation can cause bloating, abdominal pain, cramping, and changes in bowel habits.
Lab analysis of canned beans (a mix of red, brown, and white varieties) found a fructan content of about 0.24% by fresh weight. That may sound small, but a standard serving of beans is roughly 179 grams, which delivers around 0.43 grams of fructans alone, not counting the GOS content. Both of these FODMAP types stack together to push white beans into the high category at normal portions.
Serving Sizes That Stay Low FODMAP
Navy beans (one of the most common white bean varieties) are rated high in GOS at just a quarter cup (44 grams). At half a cup (88 grams), they’re high in both GOS and fructans. So a full serving is off the table during the elimination phase of a low FODMAP diet.
Canned butter beans, another white bean variety, have a Monash-tested “green light” serving of roughly a quarter cup (35 grams). That’s about two to three tablespoons, enough to add some protein and texture to a dish but not enough to make beans the star of a meal. Cannellini beans fall into a similar range, though exact thresholds can vary slightly. The Monash FODMAP app, which was updated with a full review of its pulses category in 2025, is the most reliable source for current serving size data on specific varieties.
Canned vs. Dried Beans
Canned beans are generally a better choice on a low FODMAP diet than dried beans cooked at home. GOS and fructans are water-soluble, meaning they leach out of the beans and into the surrounding liquid during the canning process. When you drain and rinse canned beans, you’re washing away a meaningful portion of those FODMAPs. Dried beans cooked in your own kitchen retain more of these carbohydrates unless you take specific steps to reduce them.
If you prefer cooking from dried, soaking is essential. Research shows that soaking beans for at least 12 hours significantly increases the leaching of oligosaccharides (the FODMAP-containing sugars) into the soaking water. The critical step is to discard that soaking water entirely and cook in fresh water. This mimics some of what the canning process achieves. One practical note: adding acidic ingredients like tomatoes or vinegar before the beans are fully cooked can dramatically extend cooking time, so save those for the end.
How to Use White Beans in Low FODMAP Cooking
The most realistic way to include white beans is as a supporting ingredient rather than a main protein source. A quarter cup of canned, drained, and rinsed butter beans scattered across a salad, stirred into a soup, or mashed onto toast with an egg keeps you in the low FODMAP zone while still adding fiber and plant protein. Spreading that small amount across a larger dish also helps dilute the FODMAP load per bite.
Portion control matters more with beans than with almost any other food on the low FODMAP diet, because the jump from “safe” to “high” happens within just a few extra tablespoons. If you’re in the elimination phase, measuring with a kitchen scale is worth the effort. During the reintroduction phase, you can test your personal tolerance by gradually increasing your serving size over several days and tracking symptoms.
Lower FODMAP Alternatives
If a quarter cup of white beans doesn’t feel worth the effort, other protein sources may work better for you. Firm tofu is low FODMAP in generous servings because the processing removes most of the oligosaccharides found in whole soybeans. Canned lentils (drained and rinsed) also have a tested low FODMAP serving size and offer a similar earthy, creamy quality in soups and stews. Tempeh is another option, with fermentation reducing some of its FODMAP content.
Among legumes specifically, chickpeas (canned, drained, and rinsed) have a tested green-light serving of about a quarter cup as well, so they’re comparable to white beans in terms of how much you can safely eat. The advantage of checking the Monash app is that it lets you compare across dozens of legume varieties and find the ones that give you the most food for the smallest FODMAP cost.