Brown rice is not a good choice during diarrhea. Its high fiber content and tough bran layer can speed up bowel movements and make symptoms worse. White rice is the better option when your gut is already irritated, because it’s low in fiber, easy to digest, and helps firm up loose stools.
Why Brown Rice Makes Diarrhea Worse
The difference between brown and white rice comes down to one thing: the bran layer. Brown rice keeps its outer bran and germ intact, which is what gives it more fiber, more nutrients, and a chewier texture. That bran is mostly insoluble fiber, the type your body can’t break down. In normal circumstances, that’s a benefit. During diarrhea, it’s a problem.
Insoluble fiber holds onto water in the intestines and increases stool bulk. That extra bulk stimulates your colon to push things through faster, which reduces the time your body has to reabsorb water. When you already have loose, watery stools, the last thing you want is something accelerating transit even more. Brown rice also contains phytic acid, a compound concentrated in the bran layer that can slow digestion and cause bloating, gas, and heaviness, especially when the gut lining is already inflamed or sensitive.
Why White Rice Is Recommended Instead
White rice has had its bran and germ removed, leaving behind mostly starch. That makes it one of the easiest grains for your body to break down. It’s a staple of the BRAT diet (bananas, rice, applesauce, toast), a set of bland, low-fiber foods traditionally recommended for short-term use during stomach upset. The rice in that list specifically means white rice.
Low-fiber diet guidelines for managing diarrhea consistently list brown rice as a food to avoid and white rice as a food you can have. White rice is soft, bland, and gentle on an irritated digestive tract. It provides calories and energy without stimulating your bowels the way whole grains do. Plain white rice cooked until soft is one of the most gut-friendly foods you can eat during a bout of diarrhea.
Rice Water as a Rehydration Tool
Beyond eating plain white rice, the starchy water left over from cooking rice has a long history as a home remedy for diarrhea. Rice water provides a small amount of calories and electrolytes while being extremely easy to absorb. It’s gentle enough that it has even been used for infants with loose stools, mixed with other fluids in gradually decreasing ratios over several days as symptoms improve.
To make it at home, simply cook white rice with extra water, then strain out the grains and let the cloudy liquid cool to room temperature before sipping it. This works best alongside other rehydration strategies like oral rehydration solutions, especially if you’re losing a lot of fluid.
Soluble Fiber Can Actually Help
Not all fiber worsens diarrhea. Soluble fiber, the type found in foods like bananas, applesauce, oatmeal, and peeled potatoes, absorbs fluid in the intestines and can help thicken loose stools. It forms a gel-like consistency that slows things down rather than speeding them up. During diarrhea, foods with soluble fiber are generally well tolerated and can reduce the number of watery bowel movements.
Brown rice does contain some soluble fiber, but the large amount of insoluble fiber in its bran layer overwhelms any potential benefit. You’re better off getting soluble fiber from other sources while keeping your grain choices simple and refined until symptoms resolve.
When to Bring Brown Rice Back
Once your stools have been normal and formed for a full day or two, you can start reintroducing higher-fiber foods gradually. That means adding back vegetables, fruits with skins, whole wheat bread, and brown rice in small portions rather than all at once. If you jump straight back to large servings of brown rice or other whole grains while your gut is still recovering, you risk triggering another round of loose stools or cramping.
Start with a small portion of brown rice mixed into a meal that’s otherwise easy to digest, and see how your body responds over the next 12 to 24 hours. If everything stays stable, you can increase the amount at your next meal. Your gut lining needs time to recover after a bout of diarrhea, and easing back into high-fiber foods gives it that window.