Quinoa flour: a richer gluten-free flour, with small and mixed trial results

Two meta-analyses of quinoa trials land on opposite sides for body weight. One pooled 5 randomized trials in 206 adults and found quinoa seed lowered weight by 2.8 lb (1.26 kg), with a 95% confidence interval from 0.4 to 5.2 lb (0.18 to 2.35 kg). The other pooled 7 trials in 258 adults eating 0.53 to 1.8 oz (15 to 50 g) of quinoa a day for 28 to 180 days and found no effect on weight or BMI. The answer stays open because both pools are small and both mix forms of quinoa, mostly the whole seed rather than flour. The trials that used the flour itself are short. In 40 adults aged 50 to 75, most with high cholesterol, 15 g a day of biscuits made with 60% quinoa flour lowered LDL cholesterol by 9.7 mg/dL (0.25 mmol/L) more than wheat biscuits over 4 weeks. In 37 overweight men, bread with 20 g of quinoa flour a day for 4 weeks lowered LDL and fasting glucose no more than wheat bread did.

The numbers, per 3.5 oz (100 g)

How much is actually in it

• Quinoa flour in USDA Foundation data carries 11.9 g protein, 6.6 g fat, 6.3 g fiber, 164 mg magnesium, 4.5 mg iron and 2.8 mg zinc per 3.5 oz (100 g). — USDA Foundation Foods, 8 analyzed samples of quinoa flour (n = 8 samples) Evidence E source
  Per 100 g: protein 11.92 g, fat 6.60 g, fiber 6.30 g, starch 58.09 g, magnesium 163.8 mg, phosphorus 369.3 mg, potassium 550.9 mg, iron 4.53 mg, zinc 2.77 mg
• An audit of 130 Australian supermarket flours found gluten-free products lower in protein and fiber, with legume, buckwheat and quinoa flour the better gluten-free choice. — 130 home-baking flour products in four Sydney supermarkets, February 2020 (n = 130 products) Evidence C source
  Gluten-free flours lower protein and fiber; quinoa flour among better options

What a real portion looks like

• Only 1.07% of US adults ate quinoa on a recall day in NHANES 2013 to 2018, and observational data link it with lower BMI, waist, triglycerides and cholesterol. — US adults, NHANES 2013 to 2018, two 24-hour recalls Evidence C source
  Prevalence of quinoa intake 1.07% (barley 0.36%, buckwheat 0.04%)

What your body absorbs

• A food technology review lists saponins and phytic acid among food compounds that hinder the absorption of vitamins and minerals, without naming quinoa. — food processing studies of anti-nutritional factors Evidence D source
  Qualitative: anti-nutritional factors hinder vitamin and mineral absorption; quinoa not named

What cooking and storage change

• Lab analysis of a bread made with 20% quinoa flour found slightly more protein, less available carbohydrate and more fiber, mostly insoluble, than refined wheat bread. — test breads analyzed for a crossover trial (20% quinoa flour vs 100% refined wheat) Evidence D source
  Quinoa bread: slightly higher protein, lower available carbohydrate, higher (insoluble) fiber, slightly higher phenolics

What it does to your health

• A meta-analysis of 7 trials in 258 adults eating 0.53 to 1.8 oz (15 to 50 g) of quinoa daily for 28 to 180 days found no effect on body weight or BMI. — 258 adults aged 31 to 64 in 7 randomized trials, 15 to 50 g quinoa per day, 28 to 180 days (n = 258) Evidence A source
  BMI MD -0.25 (95% CI -0.98 to 0.47); body weight MD -1.2 lb (95% CI -6.7 to 4.3; metric: -0.54 kg, -3.05 to 1.97); nonlinear fasting glucose dose-response
• Pooling 5 randomized trials in 206 adults, quinoa seed lowered body weight by 2.8 lb (1.26 kg) and LDL cholesterol by about 3 mg/dl. — 206 adults in 5 RCTs of quinoa seed supplementation (n = 206) Evidence A source
  Weight -2.8 lb (95% CI -5.2 to -0.4; metric: -1.26 kg, -2.35 to -0.18); LDL -3.08 mg/dl (95% CI -5.13 to -1.03); triglycerides -7.20 mg/dl
• In a 4-week crossover trial in 37 overweight men, bread with 20 g quinoa flour daily did not lower LDL or glucose more than wheat bread, though glucose area tended lower. — 37 healthy overweight men aged 35 to 70, 4 weeks per arm (n = 37) Evidence B source
  No between-group difference in LDL or fasting glucose; cumulative glucose AUC lower than wheat period (p = 0.039)

Safety, limits and interactions

• In 19 treated celiac patients, 1.8 oz (50 g) of quinoa daily for 6 weeks was well tolerated and did not worsen gut histology. — 19 adults with treated celiac disease on a gluten-free diet, 6 weeks (n = 19) Evidence C source
  Villus height to crypt depth 2.8:1 to 3:1; intra-epithelial lymphocytes 30.3 to 29.7 per 100 enterocytes

What people believe that the data does not support

• In a crossover trial in 13 adults, gluten-free rice and corn pasta raised 30-minute blood glucose 57% above wheat pasta, so gluten-free alone does not mean a gentler glucose response. — 13 healthy adults, single test meals, wheat pasta vs three gluten-free pastas (one corn and quinoa) (n = 13) Evidence B source
  Rice and corn pasta: 30-min glucose +57% vs wheat (p = 0.011); corn and quinoa pasta not singled out
• The EU did not authorize a claim that quinoa stimulates hair bulbs and favors hair growth. — EU Register on nutrition and health claims Evidence E source
  Status: non-authorized

Who this works differently for

• In a 4-week crossover trial in 40 adults aged 50 to 75, 15 g daily of biscuits made with 60% quinoa flour lowered LDL cholesterol by 9.7 mg/dL (0.25 mmol/L) more than wheat biscuits. — 40 healthy adults aged 50 to 75, 82.5% with high cholesterol, 4 weeks per arm (n = 40) Evidence B source
  Total cholesterol -12 mg/dL (-0.30 mmol/L), LDL -9.7 mg/dL (-0.25 mmol/L), weight -1.3 lb (-0.61 kg) vs wheat biscuits (all P < 0.05)
• In a 1-year trial in 207 people with impaired glucose tolerance, 3.5 oz (100 g) of quinoa daily cut 2-hour glucose and diabetes onset more than mixed whole grains or control. — 207 adults with impaired glucose tolerance, 1 year, quinoa replacing about half of staple food (n = 207) Evidence B source
  Lower 2-hour postprandial glucose, fasting insulin, HOMA-IR and diabetes development vs multigrain and control (P < 0.05)

What is still unknown

• Across 8 USDA samples of quinoa flour, iron ranged from 3.6 to 6.6 mg, fiber from 4.4 to 8.2 g and manganese from 1.3 to 3.2 mg per 3.5 oz (100 g). — USDA Foundation Foods, 8 analyzed samples of quinoa flour (n = 8 samples) Evidence E source
  Iron 3.55-6.6 mg (median 4.29); fiber 4.35-8.24 g (median 6.42); manganese 1.34-3.21 mg (median 1.7); calcium 22.9-47.6 mg

The bottom line

Per 100 g, USDA Foundation data from 8 samples give quinoa flour 11.9 g protein, 6.3 g fiber, 164 mg magnesium and 4.5 mg iron. The samples varied widely, iron from 3.6 to 6.6 mg and fiber from 4.4 to 8.2 g per 3.5 oz (100 g), and the dataset does not say why. An audit of 130 home-baking flours in Sydney supermarkets, read from labels, found gluten-free products lower in protein and fiber and named legume, buckwheat and quinoa flour as the better gluten-free choices. Gluten-free says nothing on its own about blood sugar. In a crossover trial in 13 adults, a rice and corn gluten-free pasta raised 30-minute blood glucose 57% above wheat pasta, and the corn and quinoa pasta in the same trial was not singled out in the abstract. The longest trial used the grain. In 207 adults with impaired glucose tolerance, a year of quinoa replacing about half their staple food led to lower 2-hour glucose and fewer new cases of diabetes than mixed whole grains or the control diet, and the abstract gives no effect sizes. People with celiac disease have the most specific question. In 19 adults with treated celiac disease, 1.8 oz (50 g) of quinoa a day for 6 weeks was well tolerated and did not worsen the gut lining, in a study with no control group that used the grain and did not check for gluten contamination. We found no studies of quinoa flour in pregnancy, in children or in kidney disease, and no data on drug interactions. Only 1.07% of US adults ate quinoa on a survey recall day in 2013 to 2018. The EU did not authorize a claim that quinoa favors hair growth.

Sources

1. qfl-r4-01 · reference dataset
   Flour, quinoa: Protein 11.92235 G · Total lipid (fat) 6.601 G · Fiber, total dietary 6.295 G · Starch 58.09 G · Magnesium, Mg 163.8 MG · Phosphorus, P 369.3 MG · Potassium, K 550.9 MG · Iron, Fe 4.528 MG · Zinc, Zn 2.77 MG, per 100 g, 8 samples
   USDA FoodData Central Foundation Foods, release 2026-04-30, FDC 2512372 · checked 2026-10-02
2. qfl-r4-12 · cross-sectional audit
   Self-raising flours were significantly higher in sodium (p < 0.001) and gluten-free products were lower in protein and dietary fibre, making legume, buckwheat and quinoa flour a better choice.
   Nutrients, 2020 · checked 2026-10-02
3. qfl-r4-13 · cross-sectional survey
   The prevalence of barley, buckwheat and quinoa consumption among US adults were 0.36%, 0.04% and 1.07%, respectively.
   Nutrients, 2025 · checked 2026-10-02
4. qfl-r4-10 · systematic review, food technology
   Naturally occurring compounds in foods, such as tannins, saponins, phytic acid, gossypol, lectins, and various enzyme inhibitors (protease inhibitors (PIs) and amylase inhibitors), function as anti-nutritional factors (ANFs) that hinder the absorption of essential vitamins and minerals
   J Food Sci, 2025 · checked 2026-10-02
5. qfl-r4-07 · in vitro food analysis
   The composition of the two test breads was broadly very similar, with a slightly higher protein and lower available carbohydrate content in the quinoa bread compared with the refined wheat bread. The fibre content of the quinoa bread was higher than the refined wheat bread mainly due to a higher content of insoluble fibre.
   Nutrients, 2018 · checked 2026-10-02
6. qfl-r4-03 · 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.
   Curr Med Chem, 2024 · checked 2026-10-02
7. qfl-r4-04 · meta-analysis of RCTs
   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 2026-10-02
8. qfl-r4-06 · RCT
   After 4 weeks of intervention, blood glucose and low density lipoprotein (LDL) cholesterol were significantly lower than baseline in both groups but there was no difference between quinoa and control.
   Nutrients, 2018 · checked 2026-10-02
9. qfl-r4-09 · prospective cohort
   Addition of quinoa to the GFD of celiac patients was well tolerated and did not exacerbate the condition.
   Am J Gastroenterol, 2014 · checked 2026-10-02
10. qfl-r4-08 · RCT
    Post-hoc analysis revealed a significant difference for the 30-minute postprandial blood glucose concentrations: the plasma glucose concentration was 57% higher for the GF rice and corn pasta compared to traditional wheat pasta (p = 0.011).
    Food Funct, 2017 · checked 2026-10-02
11. qfl-r4-11 · 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 2026-10-02
12. qfl-r4-05 · 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 2026-10-02
13. qfl-r4-14 · RCT
    At the efficacy endpoint, the quinoa group (QG) demonstrated significantly longer time in range (TIR) and normal glucose tolerance (NGT) conversion rate, along with lower rates of 2-hour postprandial glucose (2hPG), fasting insulin (FINS), homeostatic model assessment of insulin resistance (HOMA-IR), 14-day mean blood glucose (14dMBG), and diabetes mellitus development compared to those of the multigrain and control groups (P < 0.05).
    Food Funct, 2025 · checked 2026-10-02
14. qfl-r4-02 · reference dataset
    Flour, quinoa: Iron, Fe 4.528 MG range 3.55-6.6 (median 4.29), 8 samples · Fiber, total dietary 6.295 G range 4.35-8.24 (median 6.415), 8 samples · Manganese, Mn 2.015 MG range 1.34-3.21 (median 1.7), 8 samples · Calcium, Ca 37.56 MG range 22.9-47.6, 8 samples
    USDA FoodData Central Foundation Foods, release 2026-04-30, FDC 2512372 · checked 2026-10-02