Brown rice vs quinoa: quinoa leads on paper, and the trials show modest effects

Swapping white rice for brown did not improve blood sugar control in the pooled trials we found. A meta-analysis of 7 trials in 417 adults with prediabetes or type 2 diabetes found no change in HbA1c or fasting glucose, while body weight fell by 4.9 lb (95% CI 2.8 to 6.9; metric: 2.2 kg, 1.26 to 3.13), and some of those trials were not randomized. For quinoa, a meta-analysis of 7 randomized trials in 258 adults found that 15 to 50 g a day for 28 to 180 days did not change body weight or BMI against placebo. On paper the two grains sit further apart. UK food tables give raw quinoa 13.8 g protein, 7.0 g fiber, 7.8 mg iron and 210 mg magnesium per 3.5 oz (100 g), against 7.7 g, 3.0 g, 1.05 mg and 116 mg for raw wholegrain brown rice, one average per food with no spread. These are raw values, and we found no data on how much of the iron or other minerals the body absorbs from either grain. We found no trial that compared quinoa and brown rice directly, so which of the two does more for your health is still an open question.

How much is actually in it

• Per 100 g raw, quinoa has 13.8 g protein, 7.0 g fiber, 7.8 mg iron and 210 mg magnesium, versus 7.7 g, 3.0 g, 1.05 mg and 116 mg in raw wholegrain brown rice. — Food composition, UK samples Evidence E source
  Protein 13.8 vs 7.7 g; AOAC fiber 7.0 vs 3.0 g; iron 7.80 vs 1.05 mg; magnesium 210 vs 116 mg; zinc 3.3 vs 1.8 mg; energy 309 vs 333 calories per 3.5 oz (100 g) raw
• Boiling brown rice in unsalted water takes it from 333 to 132 calories and from 7.7 to 3.6 g protein per 3.5 oz (100 g), because the grain absorbs water. — Food composition, UK samples Evidence E source
  Raw vs boiled per 3.5 oz (100 g): energy 333 vs 132 calories; protein 7.7 vs 3.6 g; fiber 3.0 vs 1.5 g; magnesium 116 vs 48 mg
• Iron in quinoa flour ranged from 3.55 to 6.6 mg per 3.5 oz (100 g) across 8 samples analyzed by USDA, a spread of 67 percent. — Quinoa flour, 8 samples (n = 8) Evidence E source
  Iron mean 4.53 mg/100 g, range 3.55-6.6; magnesium 130-177 mg; fiber 4.35-8.24 g

What a real portion looks like

• In the US dietary survey one cup of cooked quinoa weighs 6 oz (170 g) and one cup of cooked brown rice weighs 6.9 oz (195 g). — US food survey portion weights Evidence E source
  1 cup cooked: quinoa 170 g (FNDDS 56204005); brown rice 195 g (FNDDS 56205018); unspecified quantity 170 g vs 147 g
• Only 1.07 percent of US adults ate quinoa on a survey day in NHANES 2013 to 2018. — US adults, NHANES 2013-2018 Evidence C source
  Prevalence of quinoa consumption 1.07%
• In Japanese national surveys the share of adults eating brown rice rose only from 1.8 to 2.6 percent between 2012 and 2019. — Japanese adults aged 20+, 2012-2019 Evidence C source
  1.8% (95% CI 1.6-2.1) in 2012 to 2.6% (95% CI 2.0-3.4) in 2019

What your body absorbs

• In a crossover trial of 10 healthy adults, cooked brown rice emptied from the stomach more slowly than white rice, which the authors tie to the bran layer. — 10 healthy adults, acute feeding, 50 g available carbohydrate (n = 10) Evidence B source
  Slower gastric emptying for brown vs white rice, p < 0.05
• In a crossover trial, the glycemic index of brown rice was 12.1 percent lower than milled rice in 10 healthy people and 35.6 percent lower in 9 people with type 2 diabetes. — 10 healthy and 9 type 2 diabetic volunteers (n = 19) Evidence B source
  GI -12.1% (healthy), -35.6% (type 2 diabetes) vs milled rice of the same batch

What cooking and storage change

• USDA retention factors for rice cooked and drained keep 60 percent of folate and 75 percent of thiamin, versus 70 and 80 percent when the cooking water is absorbed. — Cereal grains group, white and brown rice Evidence E source
  Cooked drained (431): folate 60%, thiamin 75%, iron 90%, magnesium 95%; cooked water used (432): folate 70%, thiamin 80%, iron 95%, magnesium 100%
• A systematic review found rice glycemic index ranging from 48 to 93, and the brown rice advantage shrinks at the longer cooking times normally used for brown rice. — Studies of postprandial glucose after rice Evidence B source
  GI range 48-93; brown lower than white at identical cooking times, inconsistent at longer cooking

What it does to your health

• A meta-analysis of 5 randomized trials in 206 adults found quinoa seed lowered triglycerides by 7.2 mg/dl and LDL cholesterol by 3.1 mg/dl. — 206 adults, 5 RCTs (n = 206) Evidence A source
  TG WMD -7.20 mg/dl (95% CI -9.52 to -4.87); LDL WMD -3.08 mg/dl (95% CI -5.13 to -1.03); body weight WMD -2.8 lb (95% CI -5.2 to -0.4; metric: -1.26 kg, -2.35 to -0.18)
• A meta-analysis of 7 trials in 417 adults with prediabetes or type 2 diabetes found brown rice instead of white rice did not change HbA1c or fasting glucose but cut body weight by 4.9 lb (2.2 kg). — 417 adults with prediabetes or type 2 diabetes, 7 trials (n = 417) Evidence B source
  HbA1c p = 0.15; FBG p = 0.95; body weight MD -4.9 lb (95% CI -6.9 to -2.8; metric: -2.2 kg, -3.13 to -1.26); HDL MD +0.10 (95% CI 0.02 to 0.17)
• A network meta-analysis of 55 trials in 3900 people ranked oat bran first for cholesterol and found brown rice ineffective for blood lipids versus control. — 3900 participants, 55 trials (n = 3900) Evidence A source
  Oat bran TC -0.35 mmol/L (95% CI -0.47 to -0.23); brown rice no significant lipid effect
• In a one-year randomized trial of 207 people with impaired glucose tolerance, 3.5 oz (100 g) of quinoa a day lowered 2-hour postprandial glucose more than 3.5 oz (100 g) of mixed whole grains. — 207 adults with impaired glucose tolerance, 1 year (n = 207) Evidence B source
  Quinoa vs multigrain and control: longer time in range, lower 2hPG, FINS, HOMA-IR and diabetes development (P < 0.05)

Safety, limits and interactions

• Observational data from 3 US cohorts of 207,556 adults link neither brown nor white rice at 5 or more servings a week to cardiovascular disease. — 207,556 US women and men, NHS, NHSII, HPFS (n = 207556) Evidence C source
  HR brown rice >=5 vs <1 serving/wk 1.01 (95% CI 0.79 to 1.28)
• FDA set a 100 ppb action level for inorganic arsenic in infant rice cereals and estimated brown rice cereals averaged 119.0 ppb versus 103.9 ppb for white rice cereals. — Infant rice cereals on the US market Evidence E source
  Mean inorganic arsenic: brown-rice infant cereals 119.0 ppb, white-rice 103.9 ppb; action level 100 ppb

What people believe that the data does not support

• The EU did not authorize a claim that quinoa stimulates the hair bulb and favors hair growth. — EU health claims register Evidence E source
  Status: Non-authorized
• The EU did not authorize a claim that germinated brown rice contributes to normal blood glucose levels. — EU health claims register Evidence E source
  Status: Non-authorized

Who this works differently for

• In a 12-month randomized trial of 40 older Japanese adults, 100 g a day of pressurized brown rice kept bone mineral density higher than white rice. — 40 elderly adults, mean age 73.1, 12 months (n = 40) Evidence B source
  BMD significantly higher in brown rice group vs white rice group at 12 months; no adverse effects
• In a 4-week crossover trial of 40 adults aged 50 to 75, quinoa biscuits lowered LDL cholesterol by 9.7 mg/dL (0.25 mmol/L) more than wheat biscuits. — 40 healthy adults aged 50-75, 4 weeks each arm (n = 40) Evidence B source
  TC -0.30 ± 0.58, LDL -0.25 ± 15 mg/dL (0.38 mmol/L), weight -1.3 lb (-0.61 kg) vs control
• A systematic review of 12 studies in 1066 people with celiac disease reported that quinoa modestly lowered cholesterol on a gluten-free diet. — 1066 participants with celiac disease, 12 studies (n = 1066) Evidence C source
  Quinoa: modest cholesterol reduction; no serious adverse events reported

What is still unknown

• A meta-analysis of 7 randomized trials in 258 adults found 0.53 to 1.8 oz (15 to 50 g) of quinoa a day did not change BMI or body weight versus placebo, with a nonlinear effect on fasting glucose. — 258 adults aged 31 to 64, 7 trials, 28 to 180 days (n = 258) Evidence A source
  BMI MD -0.25 (95% CI -0.98 to 0.47); body weight MD -0.54 (95% CI -3.05 to 1.97); FBG nonlinear, P nonlinearity 0.027
• A meta-analysis of 16 cohorts linked whole grains including brown rice with lower type 2 diabetes risk, but the brown rice result rests on few studies. — 16 prospective cohort studies Evidence C source
  Whole grains RR per 3 servings/day 0.68 (95% CI 0.58 to 0.81); brown rice inverse, few studies

The bottom line

Cooking changes the numbers per 3.5 oz (100 g). In the UK tables boiled brown rice drops from 333 to 132 calories and from 7.7 to 3.6 g protein per 3.5 oz (100 g), because the grain takes up water and the same nutrients are spread over more weight. A cup of cooked brown rice weighs 6.9 oz (195 g) in the US survey, and a cup of cooked quinoa 170 g. When rice is boiled and drained, USDA factors keep 60 percent of folate and 75 percent of thiamin, against 70 and 80 percent when the rice absorbs all its water. Those factors cover white and brown rice together, and there is no row for quinoa. USDA analyzed 8 samples of quinoa flour and found iron anywhere from 3.55 to 6.6 mg per 3.5 oz (100 g), so the figure on a label is one point in a wide range. Brown rice scored lower than white on the glycemic index in a crossover of 10 healthy people and 9 with type 2 diabetes, by 12.1 percent in the healthy group and 35.6 percent in the diabetes group, using one batch of rice. A systematic review found rice ranging from 48 to 93 on that scale, and at the longer cooking times brown rice usually gets, its lead over white became small and inconsistent. In 10 healthy adults, brown rice left the stomach more slowly than white rice. For cholesterol, a network meta-analysis of 55 trials in 3900 people found brown rice ineffective for blood lipids against control. The quinoa results are small and partly in conflict. A meta-analysis of 5 randomized trials in 206 adults found quinoa seed lowered body weight by 2.8 lb (95% CI 0.4 to 5.2; metric: 1.26 kg, 0.18 to 2.35), which the larger meta-analysis above did not find. Both pooled only a handful of small trials, which is why the answer on weight stays unclear. In a 4-week crossover in 40 adults aged 50 to 75, biscuits made with quinoa flour lowered LDL cholesterol by 9.7 mg/dL (0.25 mmol/L) more than wheat biscuits. For people with celiac disease, a review of 12 studies in 1066 participants reported that quinoa modestly lowered cholesterol on a gluten-free diet, without a pooled number. The caution that matters is arsenic in rice cereal for babies. FDA set an action level of 100 ppb for inorganic arsenic in infant rice cereal and estimated that brown rice infant cereals averaged 119.0 ppb, against 103.9 ppb for white rice cereals. That figure is about infant cereal, and we found no arsenic data for quinoa. In adults, three US cohorts of 207,556 people linked 5 or more servings of brown rice a week to no difference in cardiovascular disease, HR 1.01 (95% CI 0.79 to 1.28). The EU did not authorize claims that germinated brown rice helps keep blood glucose normal or that quinoa helps hair grow.

Sources

1. brqn-daily-r3-01 · reference dataset
   CoFID 14-843 Quinoa, raw: Energy 309 kcal/100 g · Protein 13.8 g · AOAC fibre 7.0 g · Iron 7.80 mg · Magnesium 210 mg · Zinc 3.3 mg; CoFID 11-868 Rice, brown, wholegrain, raw: Energy 333 kcal/100 g · Protein 7.7 g · AOAC fibre 3.0 g · Iron 1.05 mg · Magnesium 116 mg · Zinc 1.8 mg
   CoFID 2021 (Public Health England), codes 14-843 and 11-868 · checked 2026-09-29
2. brqn-daily-r3-02 · reference dataset
   CoFID 11-868 Rice, brown, wholegrain, raw: Energy 333 kcal · Protein 7.7 g · AOAC fibre 3.0 g · Magnesium 116 mg; CoFID 11-869 Rice, brown, wholegrain, boiled in unsalted water: Energy 132 kcal · Protein 3.6 g · AOAC fibre 1.5 g · Magnesium 48 mg
   CoFID 2021 (Public Health England), codes 11-868 and 11-869 · checked 2026-09-29
3. brqn-daily-r3-03 · reference dataset
   FDC Foundation Flour, quinoa: Iron, Fe 4.528 MG, range 3.55-6.6 (median 4.29), 8 samples · Magnesium, Mg 163.8 MG, range 130.0-177.0 · Fiber, total dietary 6.295 G, range 4.35-8.24
   USDA FoodData Central, Foundation Foods, release 2026-04-30, Flour, quinoa · checked 2026-09-29
4. brqn-daily-r3-04 · reference dataset
   FNDDS 2708400 Quinoa, no added fat: 1 cup, cooked 170 g · Quantity not specified 170 g; FNDDS 2708414 Rice, brown, cooked, no added fat: 1 cup, cooked 195 g · Quantity not specified 147 g
   USDA FNDDS (FoodData Central), fdc_id 2708400 and 2708414 · checked 2026-09-29
5. brqn-daily-r3-19 · Cross-sectional
   The prevalence of barley, buckwheat and quinoa consumption among US adults were 0.36%, 0.04% and 1.07%, respectively.
   Nutrients, 2025 · checked 2026-09-29
6. brqn-daily-r3-20 · Cross-sectional
   The percentage of brown rice consumers increased from 1.8% (95% confidence interval: 1.6-2.1) in 2012 to 2.6% (95% confidence interval: 2.0-3.4) in 2019.
   Nutrients, 2024 · checked 2026-09-29
7. brqn-daily-r3-11 · Crossover RCT
   In human subjects, low-amylose and high-amylose brown rice delayed gastric emptying compared to white rices regardless of amylose content or temperature-cycling (p < 0.05). CONCLUSIONS: Whole grain brown rice had slower gastric emptying rate, which appears to be related to the physical presence of the bran layer.
   Eur J Clin Nutr, 2018 · checked 2026-09-29
8. brqn-daily-r3-12 · Crossover RCT
   In healthy volunteers, the glycemic area and glycemic index were, respectively, 19.8% and 12.1% lower (p < 0.05) in brown rice than milled rice, while in diabetics, the respective values were 35.2% and 35.6% lower.
   Int J Food Sci Nutr, 2006 · checked 2026-09-29
9. brqn-daily-r3-05 · reference dataset
   USDA-RETN-R6:431 RICE,WHITE/BROWN,COOKED,DRAINED: folate 60% · thiamin 75% · iron 90% · magnesium 95%; USDA-RETN-R6:432 RICE,WHITE/BROWN,COOKED,WATER USED: folate 70% · thiamin 80% · iron 95% · magnesium 100%
   USDA Table of Nutrient Retention Factors, Release 6 (2007), codes 431 and 432 · checked 2026-09-29
10. brqn-daily-r3-13 · Systematic review
    The milling process shows a clear effect when compared at identical cooking times, with brown rice always producing a lower PPG and PPI response than white rice. However, at longer cooking times normally used for the preparation of brown rice, smaller and inconsistent differences are observed between brown and white rice.
    Br J Nutr, 2015 · checked 2026-09-29
11. brqn-daily-r3-07 · Meta-analysis of RCTs
    Five eligible RCTs representing 206 subjects were enrolled. The pooled result showed that quinoa seed supplementation significantly lowered the body weight (WMD: -1.26 kg, 95% CI: -2.35, -0.18, p = .02)
    Phytother Res, 2021 · checked 2026-09-29
12. brqn-daily-r3-08 · Meta-analysis of trials
    Seven trials involving 417 adults with prediabetes or type 2 diabetes were included in this study. Brown-rice diet did not improve the glycemic control because it had no effect on the HbA1c level (p = 0.15) and the FBG level (p = 0.95) compared to white-rice diet. Brown-rice diet reduced body weight (p < 0.00001; MD -2.2 kg; 95% CI [-3.13 to -1.26]; I 2 = 0%).
    PeerJ, 2021 · checked 2026-09-29
13. brqn-daily-r3-09 · Network meta-analysis
    Fifty-five eligible trials with a total of 3900 participants were included. ... Barley, brown rice, wheat and wheat bran were shown to be ineffective in improving blood lipid compared with control.
    Eur J Nutr, 2019 · checked 2026-09-29
14. brqn-daily-r3-10 · RCT
    In total, 207 participants diagnosed with IGT were randomly assigned to the quinoa group (QG; 100 g day-1, replacing about half of the total daily staple food), multiple whole grain group (WGG; 100 g day-1), or control group (CG) and followed for one year.
    Food Funct, 2025 · checked 2026-09-29
15. brqn-daily-r3-14 · Prospective cohorts
    The multivariable-adjuted HR of developing CVD comparing ≥5 servings/wk with <1 serving/wk was 0.98 (95% CI: 0.84, 1.14) for white rice, 1.01 (0.79, 1.28) for brown rice, and 0.99 (0.90, 1.08) for total rice.
    Am J Clin Nutr, 2015 · checked 2026-09-29
16. brqn-daily-r3-23 · Agency guidance
    a 100 ppb limit could reduce the mean concentration of inorganic arsenic in brown-rice infant cereals from 119.0 ppb to 79.0 ppb and in white-rice infant cereals from 103.9 to 83.5 ppb.
    FDA, Supporting Document for Action Level for Inorganic Arsenic in Rice Cereals for Infants (2020) · checked 2026-09-29
17. brqn-daily-r3-21 · Regulatory decision
    POL-HC-7865 Quinoa (Chenopodium quinoa) Stimulation of the hair bulb, favouring the growth of the hair Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7865, snapshot 2026-09-21 · checked 2026-09-29
18. brqn-daily-r3-22 · Regulatory decision
    POL-HC-8510 Vibigaba (germinated brown rice) Contributes to the maintenance of normal blood glucose levels. -/- Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-8510, snapshot 2026-09-21 · checked 2026-09-29
19. brqn-daily-r3-16 · RCT
    The UHHPBR-intake group (n=20) consumed 100 g of UHHPBR and 100 g of white rice (WR) per day for 12 mo, while the WR-intake group (n=20) consumed 200 g of WR per day.
    J Nutr Sci Vitaminol (Tokyo), 2019 · checked 2026-09-29
20. brqn-daily-r3-17 · Crossover RCT
    Significantly greater decreases in total and LDL cholesterol concentrations (- 0.30 ± 0.58 and - 0.25 ± 0.38 mmol/L, respectively), TC: HDL ratio (- 0.11 ± 0.30), weight (- 0.61 ± 0.89 kg) and BMI (- 0.22 ± 0.34 kg/m2) were apparent following consumption of the quinoa versus control biscuits (all P < 0.05).
    Eur J Nutr, 2020 · checked 2026-09-29
21. brqn-daily-r3-18 · Systematic review
    Twelve studies (1,066 participants) were included. ... Quinoa modestly lowered cholesterol, and amaranth enhanced growth and corrected trace element deficiencies in children. No study reported serious adverse events; adherence improved when prebiotics diversified the GFD.
    J Gastrointestin Liver Dis, 2026 · checked 2026-09-29
22. brqn-daily-r3-06 · Meta-analysis of RCTs
    Seven trials comprising 258 adults with mean ages of 31 to 64 years were included in this review. Studies used 15 to 50 grams of quinoa/per day as an intervention, and the intervention was between 28 to 180 days. ... our findings showed that quinoa seed supplementation did not have a significant effect on BMI (MD: -0.25; 95% CI: -0.98, 0.47; I2=0%, P = 0.998) and BW (MD: -0.54; 95% CI: -3.05, 1.97; I2=0%, P = 0.99), when compared with placebo.
    Curr Med Chem, 2024 · checked 2026-09-29
23. brqn-daily-r3-15 · Meta-analysis of cohorts
    Inverse associations were observed for subtypes of whole grains including whole grain bread, whole grain cereals, wheat bran and brown rice, but these results were based on few studies, while white rice was associated with increased risk.
    Eur J Epidemiol, 2013 · checked 2026-09-29