Rice is not a particularly good source of fiber. A cup of cooked white rice contains just 1.4 grams of dietary fiber, which is 5% of the recommended daily value of 28 grams. Brown rice does better at 3.5 grams per cup, but even that falls short compared to other whole grains. Rice has real nutritional value, but if you’re trying to increase your fiber intake, it shouldn’t be your primary strategy.
White Rice vs. Brown Rice
The difference between white and brown rice comes down to processing. Brown rice keeps its outer bran layer intact, and that’s where most of the fiber lives. When rice is milled into white rice, that bran gets stripped away, taking roughly 60% of the fiber with it.
Here’s what that looks like per cooked cup:
- Brown rice (long-grain): 3.5 grams of fiber
- White rice (long-grain): 1.4 grams of fiber
- Wild rice: 3.0 grams of fiber
Brown rice’s fiber is mostly the insoluble type. Out of every gram of total fiber, about 87% is insoluble and 13% is soluble. Insoluble fiber adds bulk to stool and helps food move through your digestive tract. Soluble fiber, which dissolves in water and helps regulate blood sugar and cholesterol, is present in brown rice but only in small amounts.
How Rice Compares to Other Grains
When you stack rice against other common grains, its fiber content looks modest. A cup of cooked quinoa delivers 5.2 grams of fiber, nearly three times what white rice provides and about 50% more than brown rice. Oats, lentils, and barley all outperform rice by a wide margin as well. Even a single medium pear or a half-cup of black beans will give you more fiber than a full serving of brown rice.
That doesn’t make rice a bad food. It’s an excellent source of energy, easy to digest, and a dietary staple for billions of people. But if your goal is specifically to hit 28 grams of fiber per day, rice contributes only a small fraction of that target. You’d need eight cups of cooked brown rice to meet your daily fiber needs from rice alone.
The Resistant Starch Factor
There’s one interesting wrinkle. When you cook rice and then cool it (by refrigerating it overnight, for example), some of the starch converts into resistant starch. This type of starch behaves similarly to fiber in your gut. It resists digestion in the small intestine and feeds beneficial bacteria in the colon, much like soluble fiber does.
Research published in the Asia Pacific Journal of Clinical Nutrition found that cooling cooked white rice roughly doubled its resistant starch content, from 0.64 grams per 100 grams up to 1.3 grams after one cooling cycle. A second cooling cycle pushed it to 1.65 grams. That’s a meaningful increase in percentage terms, but the absolute numbers are still small. Reheating the rice after cooling preserves most of this resistant starch, so dishes like fried rice made from day-old rice do carry a slight fiber-like benefit.
Getting More Fiber From Rice-Based Meals
If rice is a staple in your diet, the simplest upgrade is switching from white to brown. That single change nearly triples your fiber per serving. Beyond that, the real gains come from what you pair with rice rather than from the rice itself.
A cup of black beans adds about 15 grams of fiber to a rice bowl. Broccoli, sweet potatoes, avocado, and chickpeas are all high-fiber additions that complement rice well. Even topping rice with a handful of seeds or nuts adds a gram or two. The rice becomes a vehicle for fiber-rich ingredients rather than the fiber source itself.
Some commercial products now add plant-based fiber to rice, claiming up to ten times the fiber of standard white rice. These can help if you want the taste and texture of white rice with a fiber boost, though reading the nutrition label is the only reliable way to verify what you’re actually getting.
Who Benefits From Low-Fiber Rice
Low fiber isn’t always a downside. White rice is one of the most easily digestible grains available, which makes it useful in specific situations. People recovering from stomach illness, managing inflammatory bowel disease flares, or following a low-residue diet often rely on white rice precisely because it’s gentle on the gut. It’s a core part of the BRAT diet (bananas, rice, applesauce, toast) recommended during digestive recovery. In these contexts, the low fiber content is the point, not a limitation.
For everyone else, rice works best as part of a varied diet. It provides quick energy and pairs well with nearly everything, but it won’t move the needle much on your daily fiber goals without help from the foods around it.