The No. 1 Grain to Add to Your Meals for More Protein, According to Nutritionists

It has a reputation as the “it” grain in health food circles, and nutrition experts say it's not hype. When asked which grain is best for protein, they agree on quinoa. You might not be familiar with this small seed we use as a grain, and if you aren't, our experts say you should try it. Quinoa consistently comes out on top for protein quality and nutrient density when compared with other grains and grain-like seeds. We spoke to nutritionists to learn why.

Why Quinoa Is the No. 1 Grain for Protein

Quinoa may sit alongside grains on the grocery store shelf, but it's technically a pseudocereal—a seed that cooks and eats like a grain. Nutritionists often highlight quinoa for its protein content. It “contains all nine essential amino acids," explains Kate Scarlata, MPH, RDN, LDN, which is how it qualifies as a complete protein.

The “complete” label matters because most plant-based grains fall short in at least one essential amino acid. Quinoa's amino acid profile makes it unique among plant foods. “Your body is getting all the amino acids, the building blocks of protein, when consuming quinoa,” explains Scarlata.

While quinoa can fit into almost any eating pattern, certain groups may benefit more from consuming higher-protein grains and grain-like seeds.

Athletes, older adults, people using GLP-1 medications, and some vegans are all groups who may need more protein, says Scarlata. And quinoa can help bridge that gap. Jessica Cording, MS, RD, CDN, IFNCP, adds that protein plays roles in satiety, muscle maintenance, and metabolic health, making it broadly useful for most people, not just specific populations. However, she notes an exception: people with chronic kidney disease may need to be more mindful of total protein intake.

How Quinoa Compares to Other Grains

Quinoa provides about 8 grams of protein per cooked cup, says Cording. That's roughly double that of many common grains like rice, which has around 4 grams per cup, and oats, which yield about 5 grams of protein per cup cooked. Even higher-protein grains like farro or buckwheat generally remain below or around quinoa's level unless specifically fortified.

Cording points out that while other grains (and even whole grain pasta) can contribute meaningful protein, most don't match quinoa's combination of protein quality and completeness. Quinoa also brings additional nutritional advantages. It provides “important minerals like magnesium and iron,” says Scarlata, along with being naturally gluten-free, making it accessible for people with celiac disease or gluten intolerance.

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Look Beyond Protein

Despite quinoa's high protein content, our experts caution against viewing any grain as a standalone protein source in most diets. “For most healthy adults, you want to aim for around 30 grams of protein per meal,” says Scarlata, which is a far cry from quinoa's 8 per cup. In other words, quinoa helps, but rarely carries a meal on its own.

Plant protein quality is best understood in context, says Scarlata. While quinoa is a complete protein, many grains are lower in lysine, an amino acid that is more abundant in legumes, dairy, eggs, and animal proteins. Over the course of a day, these sources naturally complement each other.

Don't Forget Fiber

Although protein gets the spotlight, fiber may be more important for long-term health, say our nutrition experts. “From a gut health perspective, the fiber content of a grain is equally, if not more, important than the protein,” says Scarlata, adding that “about 95 percent of Americans do not meet their recommended fiber goals.”

Fiber supports digestive health, heart health, and even colon cancer risk reduction. It also feeds the gut microbiome, which Scarlata describes as playing a role in immunity, vitamin production, and hormonal balance.

Cording reinforces this point, noting that fiber supports satiety, blood sugar regulation, and digestive health, with experts recommending fiber intake ranging from 25–38 grams per day. Whole grains, including quinoa, naturally provide fiber along with nutrients like B vitamins, magnesium, iron, and antioxidants, especially when compared to refined grains.