White rice is one of the safest and most widely tolerated staple foods for people with IBS. It’s low in FODMAPs, easy to digest, and unlikely to trigger bloating, gas, or cramping. But the type of rice you choose, how you prepare it, and even how you store it before eating can shift it from a safe staple to a potential trigger.
Why White Rice Works Well for IBS
The starch in white rice is almost completely broken down and absorbed in the small intestine, which means very little of it reaches the large intestine where bacterial fermentation causes gas and bloating. Cooking destroys most of the crystalline structure in rice starch, giving polished white rice a high glycemic index but also making it exceptionally easy to digest. For someone with IBS, that tradeoff is often worth it.
Rice is also naturally low in FODMAPs, the group of short-chain carbohydrates that are poorly absorbed and tend to draw water into the gut, triggering diarrhea and cramping in sensitive people. White rice, brown rice, and wild rice all appear on low-FODMAP food lists (wild rice up to about one cup per serving). This makes rice one of the few grains that people across all IBS subtypes can generally eat without worry.
Brown Rice Can Be a Different Story
Brown rice keeps its outer bran layer, which adds insoluble fiber. For some people with IBS, particularly those with diarrhea-predominant symptoms, that extra fiber can speed up transit time and worsen loose stools. The UK’s National Health Service specifically recommends cutting down on wholegrain foods like brown rice if diarrhea is your main symptom. NICE clinical guidelines similarly flag brown rice as a high-fiber food that may need to be limited.
If constipation is your primary issue, you might assume brown rice would help. But insoluble fiber isn’t the type most often recommended for IBS-related constipation. Soluble fiber, found in foods like oats, carrots, and peeled potatoes, tends to be better tolerated and more effective at softening stools without increasing gas. Brown rice isn’t harmful for everyone with IBS-C, but it’s not the first-line fiber source most guidelines point to.
Cooled and Reheated Rice: A Hidden Factor
When you cook rice and then let it cool (in a rice salad, sushi, or leftovers stored in the fridge), the starch molecules realign into a form called resistant starch. This type of starch resists digestion in the small intestine and instead travels to the colon, where gut bacteria ferment it. For healthy guts, that fermentation produces beneficial short-chain fatty acids. For people with IBS, it can produce excess gas, bloating, and discomfort.
Reheating doesn’t fully reverse this process. Once resistant starch forms through cooling, a significant portion stays resistant even after you microwave or reheat the rice. If you notice that leftover rice bothers you more than freshly cooked rice, this is likely why. Eating rice while it’s still freshly prepared minimizes resistant starch content and keeps it in the “easy to digest” category.
Congee: The Gentlest Preparation
Congee, a loose rice porridge made by cooking rice in a large amount of water for an extended time, is one of the most gut-friendly ways to eat rice. The long cooking process breaks down the grain completely, creating a soft, easily absorbed consistency that requires minimal digestive effort. UC San Diego’s Center for Integrative Health describes congee as particularly beneficial for the stomach and intestines, noting its long history as a medicinal food for people with gastrointestinal complaints.
During an IBS flare, when your gut is especially reactive, congee can be easier to tolerate than regular steamed rice. The extra water also helps with hydration, which matters if diarrhea has been an issue. You can cook it plain with just water and a pinch of salt, or use a mild broth for flavor.
Portion Size Still Matters
Even though rice is low-FODMAP, eating a large portion at once can still cause discomfort. A heavy meal of any kind stretches the stomach, triggers stronger gut contractions, and can set off the exaggerated motility responses that characterize IBS. Keeping portions moderate, roughly three-quarters to one cup of cooked rice per meal, is a practical starting point. You can always eat rice at multiple meals throughout the day if you need the calories.
Arsenic in Rice for Frequent Eaters
If rice becomes a daily staple in your diet because it’s one of the few foods you tolerate well, it’s worth knowing that rice absorbs more arsenic from soil and water than most other grains. The FDA has acknowledged that cooking rice in excess water (a ratio of about 6:1 water to rice, then draining) reduces arsenic levels in the finished product, though it also washes out some added vitamins. Rinsing rice thoroughly before cooking helps as well. Rotating between white rice, basmati (which tends to have lower arsenic levels), and other tolerated grains like oats can reduce your overall exposure.
Choosing the Right Rice for Your Symptoms
- Diarrhea-predominant IBS: Plain white rice, freshly cooked. Avoid brown rice and cooled/reheated rice. Congee is an excellent option during flares.
- Constipation-predominant IBS: White rice is still safe but won’t help move things along. Pair it with soluble fiber sources like cooked carrots or oats rather than switching to brown rice for fiber.
- Mixed or alternating IBS: White rice is a reliable baseline. Keep portions moderate and pay attention to whether leftover rice affects you differently than fresh.
- Wild rice: Low-FODMAP up to one cup per serving. It has a chewier texture and slightly more fiber than white rice, so introduce it gradually.
Rice is one of the most consistently safe foods across IBS subtypes, which is why it appears on nearly every elimination diet as an “allowed” grain. The key variables are the type you choose, how you cook it, and whether you eat it fresh or reheated. Sticking with plain, freshly prepared white rice gives you the lowest risk of triggering symptoms.