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Quinoa benefits start with its nutrition: a cup of cooked quinoa provides about 8 grams of protein that contains all nine essential amino acids, 5 grams of fiber and more than a quarter of the Daily Value for magnesium, plus manganese, copper, folate and iron, according to USDA data. It is naturally gluten-free, which makes it a popular grain swap. Direct research on quinoa as a food is limited, so most of the case rests on its nutrient profile. Below are the USDA quinoa nutrition facts, how quinoa vs rice compares, what saponins are, and what people who avoid gluten should know.
Peptide Labs does not sell quinoa or quinoa products. This article is general nutrition information, not medical advice.
Key Takeaways
- One cup of cooked quinoa has about 222 calories, 8 grams of protein and 5 grams of fiber in USDA data.
- Quinoa is a complete protein, with all nine essential amino acids, according to Harvard nutrition experts.
- Per cooked cup it has more protein, fiber and magnesium than white or brown rice, and fewer carbs.
- Quinoa is naturally gluten-free, but cross-contact with wheat can happen during growing and processing.
- Its seeds are naturally coated in bitter saponins, which are mostly removed before sale.
Quinoa nutrition per cup
Quinoa is the edible seed of a plant native to the Andes of South America, where it has been grown for about 5,000 years, according to Harvard’s Nutrition Source. It is cooked and eaten like a grain, and comes in white, red, yellow and black varieties. The table uses the USDA FoodData Central SR Legacy entry for cooked quinoa (FDC 168917), one cup of 185 grams, with percent Daily Values (%DV) based on the FDA Daily Values on Nutrition Facts labels.
| Nutrient (cooked quinoa) | Per 1 cup (185 g) | % Daily Value |
|---|---|---|
| Calories | 222 | Not applicable |
| Protein | 8.1 g | 16% |
| Carbohydrate | 39.4 g | 14% |
| Fiber | 5.2 g | 18% |
| Fat | 3.6 g | 5% |
| Manganese | 1.17 milligrams | 51% |
| Copper | 0.36 milligrams | 39% |
| Magnesium | 118 milligrams | 28% |
| Phosphorus | 281 milligrams | 22% |
| Zinc | 2.0 milligrams | 18% |
| Thiamin (vitamin B1) | 0.20 milligrams | 17% |
| Iron | 2.8 milligrams | 15% |
| Potassium | 318 milligrams | 7% |
Quinoa contributes to several of our food lists: it appears among fiber-rich foods, magnesium sources and plant iron sources. Its iron is the non-heme kind found in plants, which the body absorbs better alongside vitamin C foods, and its zinc competes with phytates, as our guide to zinc foods explains.
Cooked vs uncooked numbers
Check which version a nutrition label or app is quoting. USDA lists uncooked quinoa at about 368 calories and 14 grams of protein per 100 grams, but cooked quinoa at only 120 calories and 4.4 grams of protein per 100 grams. Nothing is lost in the pot; the seeds simply absorb water, which adds weight without adding nutrients. Comparing a dry figure with a cooked one is the most common reason quinoa numbers seem to disagree from one source to the next.
Quinoa benefits for plant protein
Quinoa protein is the main reason it gets so much attention. Harvard’s Nutrition Source describes quinoa as a complete protein, meaning it contains all nine essential amino acids the body cannot make. That sets it apart from most grains. In USDA data, a cooked cup of quinoa supplies about 0.44 grams of lysine, an essential amino acid, compared with about 0.20 grams in a cup of brown rice and 0.15 grams in white rice.
Keep the amount in perspective. Eight grams per cup is useful, but it is less than a serving of beans, tofu, Greek yogurt, eggs or meat. Quinoa works well as a protein booster in a meal rather than as the only protein source; our list of high-protein options shows where it fits. People eating less on GLP-1 medicines who are trying to keep protein up may find it a practical swap for rice or pasta (see our GLP-1 diet guide).
Quinoa vs rice and other grains
The comparison below uses USDA values for one cooked cup of each food. Cup weights differ because grains absorb different amounts of water.
| Food (USDA entry) | Calories | Protein | Carbohydrate | Fiber | Magnesium |
|---|---|---|---|---|---|
| Quinoa, cooked (168917) | 222 | 8.1 g | 39.4 g | 5.2 g | 118 milligrams |
| Brown rice, long-grain (169704) | 248 | 5.5 g | 51.7 g | 3.2 g | 79 milligrams |
| White rice, enriched (168878) | 205 | 4.3 g | 44.5 g | 0.6 g | 19 milligrams |
| Bulgur (170287) | 151 | 5.6 g | 33.8 g | 8.2 g | 58 milligrams |
| Couscous (169700) | 176 | 6.0 g | 36.5 g | 2.2 g | 13 milligrams |
In the quinoa vs rice matchup, quinoa has nearly twice the protein of white rice, about eight times the fiber, and about six times the magnesium per cup, with fewer carbohydrates. Enriched white rice has slightly more iron because iron is added during enrichment. Bulgur, a whole wheat product, beats quinoa on fiber with fewer calories, but it contains gluten. Quinoa is still a starchy food at about 39 grams of carbohydrate per cup, so it is not a low-carb choice; see our guides to low-carb foods and daily fiber if you are tracking either.
Is quinoa gluten free?
Yes, quinoa is naturally gluten-free, and it is commonly used in gluten-free diets. Two cautions matter for people with celiac disease:
- Cross-contact: the celiac organization Beyond Celiac notes that quinoa is often grown and harvested alongside wheat, barley and rye, so it can pick up gluten. It advises choosing quinoa labeled or certified gluten-free, avoiding bulk bins with shared scoops, and asking restaurants about shared pans and broth used for cooking.
- Variety differences: a 2012 laboratory study (Zevallos and colleagues, American Journal of Clinical Nutrition) tested 15 quinoa varieties. Most had no measurable celiac-triggering proteins, and the four that did were below the gluten-free limit, but two varieties triggered immune responses in lab tests using cells and tissue samples from people with celiac disease. The authors called for studies in people before drawing conclusions.
If you have celiac disease and react to quinoa, talk to your gastroenterologist or dietitian rather than guessing at the cause.
Saponins and preparing quinoa
Quinoa seeds are naturally coated in saponins, bitter compounds that protect the plant from pests. Harvard notes that harvested seeds are processed to remove them, so most quinoa sold in stores is already cleaned. Some brands still suggest rinsing before cooking to remove any remaining bitterness, so check the package. Cooked quinoa works in salads, bowls, soups and as a side in place of rice. Our low FODMAP diet guide lists quinoa among grain options, and our sibling guide to almonds covers a nut that pairs well with it.
What the research does and does not show
There are few rigorous human trials of quinoa as a whole food, and many published reviews focus on laboratory and animal studies of its compounds. That means quinoa’s case rests mainly on its nutrient profile: complete protein, fiber and minerals in a gluten-free grain. Claims that quinoa itself controls blood sugar, weight or disease go beyond the evidence. Enjoy it as a nutritious grain swap, not as a remedy.
Frequently Asked Questions
What are the main quinoa benefits?
USDA data show a cooked cup has about 8 grams of complete protein, 5 grams of fiber and large shares of the Daily Value for manganese, copper and magnesium. It is also naturally gluten-free.
Is quinoa a complete protein?
Yes. Harvard’s Nutrition Source says quinoa contains all nine essential amino acids, which is unusual for a plant food.
Is quinoa healthier than rice?
Per cooked cup, quinoa has more protein, fiber and magnesium and fewer carbohydrates than white or brown rice. Both can fit a balanced diet.
Is quinoa gluten free?
It is naturally gluten-free, but cross-contact can occur. People with celiac disease should choose quinoa labeled or certified gluten-free.
Do you need to rinse quinoa?
Most commercial quinoa has had its bitter saponin coating removed. Some brands still suggest rinsing, so follow the package.
Is quinoa low carb?
No. A cooked cup has about 39 grams of carbohydrate, fewer than rice but still a starchy food.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: High Fiber Foods: USDA List of Fruits, Vegetables, Beans and Grains, High Protein Foods: USDA Values for Meat, Dairy and Plant Sources, Foods High in Magnesium: USDA Table of Seeds, Nuts, Beans and Greens.