Which Is Better for Gut Health?

The gut plays a pivotal role in many aspects of health, from immunity to mood. To support healthy gut function, it’s important to be thoughtful about the kinds of foods you eat, especially when it comes to choosing your grains. Whole grains are especially key because they provide fiber and plant compounds that feed beneficial gut bacteria. While both quinoa and brown rice are healthful grains to include on your plate, they’re not identical when it comes to digestive benefits.

Here’s how quinoa and brown rice affect gut health, which one may be better for your gut, and simple habits that support a healthier digestive system.

How Quinoa Affects Gut Health

One way quinoa supports a healthy gut is through its fiber content. One cup of cooked quinoa provides about 5 grams of fiber, about 18% of the Daily Value for dietary fiber. While quinoa is a source of both soluble and insoluble fiber, the majority is made up of insoluble fiber. Insoluble fiber helps add bulk to stool and promote regular bowel movements, while the smaller amount of soluble fiber can be fermented by bacteria in the colon, which helps maintain a healthy gut microbiome. “Research suggests that the fibers from quinoa can feed beneficial gut bacteria and increase health-promoting metabolites like short-chain fatty acids,” says Renee Korczak, Ph.D., RDN, CSSD. These short-chain fatty acids, often called SCFAs, help support the gut lining and immune function, making fiber-rich foods like quinoa an important part of a gut-healthy eating pattern.

Quinoa also stands out as a complete plant protein, meaning it contains all nine essential amino acids—the building blocks your body needs from food. While protein itself doesn’t directly feed gut bacteria, having protein alongside fiber can help slow digestion and aid satiety, which may indirectly support digestive comfort for some people. As Korczak notes, “It’s a bonus that quinoa is also a complete plant protein.”

How quinoa is prepared can also matter for digestion. Rinsing quinoa before cooking removes saponins, naturally occurring compounds that can cause digestive discomfort in sensitive individuals. Cooking quinoa thoroughly and pairing it with other fiber-rich plant foods can further enhance its gut-supportive benefits.

How Brown Rice Affects Gut Health

Brown rice earns its title as a gut-friendly food primarily due to its fiber content and whole-grain structure. One cup of cooked brown rice provides about 3.5 grams of fiber. Much like quinoa, the majority of this fiber is insoluble fiber, which promotes regularity.

Brown rice is a whole grain, which means it retains its bran layer (the outer coating is removed when rice is refined into white rice). “When grains are refined, they lose the part of the plant that contains the fiber, the bran and the parts that include antioxidants,” says Amanda Sauceda, MS, RD. Choosing brown rice over white rice is a simple swap to increase fiber intake and support digestive health.

Brown rice also contains resistant starch, a type of carbohydrate that is selectively fermented by beneficial gut bacteria in the colon. This leads to positive changes in the composition of the gut microbiome. Cooking and cooling brown rice actually increases its resistant starch content. Reheating doesn’t eliminate the benefits of resistant starch, so enjoying leftover brown rice is a gut-friendly meal prep option.

That said, brown rice doesn’t need to be the default choice at every meal. Sauceda emphasizes flexibility for digestive comfort, explaining that “not every grain needs to be whole.” For those who are looking to incorporate more whole grains into their diet, combining whole and refined grains together can be a great place to start.

Quinoa vs. Brown Rice: Which is Better for Your Gut?

When it comes to head-to-head gut health benefits, quinoa has a slight edge over brown rice, though the difference is minimal. Quinoa provides more fiber per serving than brown rice, offers complete protein, and research suggests its fibers can support beneficial gut bacteria and short-chain fatty acid production. That said, both grains are beneficial for gut health, and the “best” choice is often the one you will actually eat consistently.

Korczak emphasizes the importance of variety over perfection. “Whole grains, along with other plant-based foods, collectively support microbial diversity,” she says. “The more diverse our microbiome, the better.” In practice, rotating between quinoa and brown rice—along with other whole grains like oats, farro and barley—is a stronger strategy than committing to just one. Different grains feed different bacteria, and a varied diet directly supports microbial diversity in the gut. Quinoa may be a better option for those who need a complete source of plant protein, while brown rice is often more affordable and widely available. Both can play a valuable role in a gut-supportive eating pattern.

Habits for Supporting a Healthy Gut

• Eat a variety of plant foods. Research shows that people who ate 30 or more different plant foods per week had more diverse gut microbiomes than those who ate fewer plants. This includes fruits, vegetables, whole grains, legumes, nuts, seeds, herbs and spices. Rotating foods throughout the week can support microbial diversity without overhauling your diet.
• Meet your daily fiber needs. Fiber fuels beneficial gut bacteria, yet most people don’t meet daily recommendations. Women are generally advised to aim for about 25 grams per day and men about 38 grams. Increasing fiber slowly and spreading it across meals can help support digestion while minimizing discomfort.
• Eat more fermented foods. Fermented foods can introduce beneficial bacteria that support the gut microbiome. “Fermented veggies can be a source of probiotics, also known as live, active bacteria that can support your gut health,” says Sauceda. Foods like kimchi, sauerkraut, yogurt and kefir can be easy additions to your diet.
• Stay hydrated. Fiber works best when paired with fluids. Drinking enough water helps fiber move through the digestive tract, supporting regular bowel movements and reducing bloating or constipation, especially as fiber intake increases.

Our Expert Take

Both quinoa and brown rice support gut health by providing fiber that feeds beneficial gut bacteria, but neither needs to be crowned the clear winner. Quinoa offers slightly more fiber per serving and the added benefit of complete plant protein, while brown rice delivers insoluble fiber and resistant starch that support digestive regularity. Rather than focusing on a single “best” grain, experts agree that consistency, variety and flexibility matter most. Rotating whole grains, meeting daily fiber needs, including fermented foods and staying hydrated are simple, sustainable ways to support a healthy gut long-term.