Millet and quinoa: strong trials that answer other people’s questions

Two meta-analyses of randomized trials on quinoa disagree with each other, and both are small. Five trials in 206 adults found that quinoa seed lowered body weight by 2.8 lb (1.26 kg), total cholesterol by 6.86 mg/dl and triglycerides by 7.20 mg/dl. Seven trials in 258 adults taking 15 to 50 g a day for 28 to 180 days found no change in body weight or body mass index, a mean difference of -1.2 lb (-0.54 kg) on an interval running from -3.05 to 1.97, although glucose improved. The two reviews searched different databases on different dates, February 2020 against November 2022, and that is the whole of the explanation available. Millet has been tested on other questions and largely on other people. Across 13 randomized trials in 1139 people it raised hemoglobin with a standardized mean difference of 0.68, measured against refined grains, and the authors say the iron content and the bioavailability of what people ate were never assessed. Across 8 randomized feeding trials in children, largely substituting rice with millet raised mean height gain by 28.2 percent over 3 months to 4.5 years, rated moderate quality by GRADE. That is a relative difference in gain rather than in height, and the pooled figure behind it is a standardized mean difference of 2.92 on an interval running from 0.23 to 5.62 with heterogeneity of 94 percent. The same authors report that where the background diet was already varied the improvement was minimal.

How much is actually in it

• By the UK composition table raw quinoa carries 13.8 g protein and 7.80 mg iron per 3.5 oz (100 g), while foxtail millet flour carries 5.8 g protein and no iron figure is reported for it at all. — CoFID 2021 entries Quinoa raw code 14-843 and Flour millet foxtail code 11-016, per 3.5 oz (100 g) Evidence E source
  Quinoa raw 309 calories, protein 13.8 g, fat 5.0 g, fiber 7.0 g, iron 7.80 mg, magnesium 210 mg, zinc 3.3 mg; millet flour 354 calories, protein 5.8 g, fat 1.7 g, calcium 40 mg, phosphorus 260 mg, thiamin 0.68 mg

What a real portion looks like

• In the USDA survey food table one cup of cooked millet and one cup of cooked quinoa both weigh 6 oz (170 g). — USDA FNDDS survey foods Millet food code 56202000 and Quinoa no added fat food code 56204005, WWEIA category Pasta noodles cooked grains Evidence E source
  Millet 1 cup cooked 170 g, 1 cup dry yields 760 g, 1 oz dry yields 110 g; quinoa no added fat 1 cup cooked 170 g

What your body absorbs

• Laboratory data suggest fermentation raises bioavailable iron from millet 3.4 times and germination 2.2 times. — 8 in vitro studies of millet processing collected in a systematic review (n = 8 in vitro studies) Evidence D source
  Bioavailable iron x3.4 after fermentation and x2.2 after germination, covering 143% and 95% of the physiological requirement of women
• Human data put iron bioavailability from a pearl millet meal at about 7.5 percent, giving roughly 1 mg of absorbed iron per meal. — Two human studies of a pearl millet-based meal collected in a systematic review (n = 2 studies) Evidence C source
  Bioavailability 7.5 plus or minus 1.6 percent, absorbed iron 1 plus or minus 0.4 mg per meal

What cooking and storage change

• In a crossover trial of 14 healthy adults in Bamako, traditional millet and sorghum foods emptied from the stomach about twice as slowly as rice, potato or wheat pasta. — 14 healthy volunteers in Bamako, Mali, crossover over 8 starchy staples, plus a 6 volunteer validation study a year later (n = 14) Evidence B source
  Gastric half-emptying time about twice as long for millet and sorghum porridges and millet couscous versus rice, potato or pasta (p < 0.0001)
• By the USDA nutrient retention table for grains cooked in water that is taken up, folate retention is 70 percent and thiamin 80 percent, with no loss recorded for magnesium, zinc or niacin. — USDA Table of Nutrient Retention Factors Release 6, group Cereal Grains and Pasta code 20, method RICE,WHITE/BROWN,COOKED,WATER USED, retention code 432, table dated Sep-75 Evidence E source
  Folate 70%, vitamin C 80%, thiamin 80%, riboflavin 90%, iron 95%, phosphorus 95%, potassium 95%, calcium 100%, magnesium 100%, zinc 100%, niacin 100%

What it does to your health

• By meta-analysis of 7 randomized trials in 258 adults, quinoa at 15 to 50 g a day changed neither body mass index nor body weight against placebo. — 258 adults with mean ages 31 to 64 years, 0.53 to 1.8 oz (15 to 50 g) of quinoa per day for 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), both non-significant, glucose improved
• By meta-analysis of 5 randomized trials in 206 adults, quinoa seed lowered body weight by 2.8 lb (1.26 kg), total cholesterol by 6.86 mg/dl and triglycerides by 7.20 mg/dl. — 206 adults in 5 randomized controlled trials, databases searched to February 2020 (n = 206) Evidence A source
  Body weight WMD -2.8 lb (95% CI -5.2 to -0.4; metric: -1.26 kg, -2.35 to -0.18), waist -0.45 in (-1.15 cm), fat mass -0.59%, triglycerides -7.20 mg/dl, total cholesterol -6.86 mg/dl, LDL -3.08 mg/dl
• By meta-analysis of 13 randomized trials in 1139 people, millet consumption raised hemoglobin with a standardized mean difference of 0.68. — 590 people in intervention groups and 549 controls across 13 randomized controlled trials (n = 1139) Evidence A source
  Standardized mean difference +0.68, hemoglobin change +13.6% in intervention versus +4.8% in control which was not significant

Safety, limits and interactions

• A systematic review of emerging protein sources including quinoa found antinutritional factors and phytoestrogens in every source examined and allergenic properties in all of them. — Faba bean, mung bean, lentil, black gram, cowpea, quinoa, hemp, leaf proteins, microalgae and duckweeds Evidence C source
  Plant secondary metabolites including antinutritional factors, phytoestrogens and oligosaccharides present in all sources, allergenic properties either intrinsic or by cross-reaction

What people believe that the data does not support

• In a double blind crossover trial of 13 healthy adults, gluten free rice and corn pasta raised 30 minute blood glucose 57 percent above wheat pasta, while the corn and quinoa pasta showed no significant difference. — 13 healthy non-smoking adults, four-way crossover of wheat pasta against three gluten-free pastas including one made from corn and quinoa flours (n = 13) Evidence B source
  Plasma glucose at 30 minutes 57% higher for the rice and corn gluten-free pasta than wheat pasta (p = 0.011)
• The European Union refused the right to say that a millet extract combination supports healthy hair growth, and it has authorized no claim about millet at all. — EU Register on nutrition and health claims, snapshot of 21 September 2026, 2330 claims of which 262 authorized (n = 1 claim on millet, 0 authorized) Evidence E source
  Claim POL-HC-6967 carries the status Non-authorized
• The European Union refused the right to say that quinoa stimulates the hair bulb and favors hair growth, and it has authorized no claim about quinoa at all. — EU Register on nutrition and health claims, snapshot of 21 September 2026, 2330 claims of which 262 authorized (n = 1 claim on quinoa, 0 authorized) Evidence E source
  Claim POL-HC-7865 carries the status Non-authorized

Who this works differently for

• By meta-analysis of 8 randomized feeding trials, millet based diets raised mean height gain 28.2 percent and weight gain 26 percent above rice based diets in children over 3 months to 4.5 years. — Children on millet-based versus regular rice-based diets, 8 randomized feeding trials, periods of 3 months to 4.5 years (n = 8 trials) Evidence A source
  Mean height +28.2%, weight +26%, mid upper arm circumference +39%, chest circumference +37% versus rice-based diets
• In a randomized trial of 223 children aged 12 to 18 months in Mumbai slums, 9 months of iron and zinc biofortified pearl millet raised hemoglobin by 0.10 g/dL while conventional millet gave a fall of 0.15 g/dL. — 223 children aged 12 to 18 months in urban slums of Mumbai, not severely anemic at baseline, daily feeding for 9 months (n = 223) Evidence B source
  Hemoglobin change +0.10 g/dL versus -0.15 g/dL on conventional millet (P = 0.04), anemia at endpoint 33.8% versus 57.6%
• In a randomized trial of 75 postpartum mothers in northern Ghana, a ginger spiced millet and soya drink raised breast milk volume by 1.7 tbsp (24.9 mL) and prolactin by 25.0 ng/mL at day 14. — 75 postpartum mothers in Tamale, northern Ghana, three arms of 25, drink taken on day 7 and day 14 (n = 75) Evidence B source
  Breast milk volume +1.7 tbsp (95% CI 1.5 to 1.9; metric: 24.9 mL, 22.1 to 27.7) and prolactin +25.0 ng/mL (95% CI 22.0 to 28.0) at day 14 versus control (p < 0.001)

What is still unknown

• The pooled height effect of millet diets in children is a standardized mean difference of 2.92 with a confidence interval running from 0.23 to 5.62 and heterogeneity of 94 percent. — Randomized feeding trials of millet versus regular rice-based diets in children, height outcome (n = 8 trials) Evidence A source
  Pooled SMD 2.92 (95% CI 0.23 to 5.62), I2 94%
• The whole millet evidence base for glycemic control and lipids in adults rests on six studies, of which only one is a randomized controlled trial. — Systematic review of millet and metabolic homeostasis in adults, databases searched to 14 January 2025 (n = 6 studies) Evidence C source
  One randomized controlled study, three randomized crossover studies and two non-randomized studies included

The bottom line

There is no USDA composition entry for this pair, and the UK table cannot settle the comparison either, because it holds quinoa as a raw grain and millet only as foxtail millet flour. Raw quinoa gives 309 calories, 13.8 g protein, 7.0 g fiber, 7.80 mg iron, 210 mg magnesium and 3.3 mg zinc per 3.5 oz (100 g). The millet flour entry gives 354 calories, 5.8 g protein, 40 mg calcium, 260 mg phosphorus and 0.68 mg thiamin, and it reports no figure at all for iron, magnesium or zinc, so the mineral difference between the two cannot be checked against that source. In the USDA survey table a cooked cup of each weighs 6 oz (170 g), which comes from both sitting in the same survey category rather than from anyone weighing them separately. Iron is the claim most often made for millet, and absorption is where it thins out. Two human studies, neither randomized, put bioavailability from a pearl millet meal at 7.5 plus or minus 1.6 percent, which works out at about 1 mg of absorbed iron per meal. That is roughly what non-heme iron does anywhere. Eight laboratory studies suggest that fermenting the grain raises bioavailable iron 3.4 times and sprouting it 2.2 times, and those are test tube figures rather than iron measured in a person. Cooked millet dishes sit in the stomach for a long time. In a crossover trial of 14 healthy adults in Bamako, thick millet and sorghum porridges and millet couscous took about twice as long to half empty as rice, potato or wheat pasta. The trial compared finished dishes, so the grain and the way it is cooked travel together in that result, and the authors note that how full people said they felt tracked what they expected more than what was measured. The USDA retention table has no entry for either grain. Its nearest method is rice cooked in water that is taken up, where folate is assigned 70 percent and thiamin 80 percent, while 100 percent for magnesium, zinc and niacin means no loss was recorded rather than none happens. That table is dated September 1975 and does not cover what rinsing quinoa to remove saponins takes with it. Gluten free is not a synonym for gentler on blood sugar, and one trial tested exactly that. In 13 healthy adults, a gluten free rice and corn pasta pushed 30 minute blood glucose 57 percent above wheat pasta, while the pasta made from corn and quinoa flours showed no significant difference from wheat. This is a single glucose response in 13 people, and the abstract gives no separate figure for quinoa on its own. The European Union has authorized no health claim for either grain. It refused the claim that a millet extract combined with L-cystine and vitamin B5 supports healthy hair growth, and it refused the claim that quinoa stimulates the hair bulb. A refusal means the evidence fell short at the time of assessment rather than that the effect was disproved. The United States register holds nothing for millet or quinoa at all. The safety evidence here is thin and it points at allergy. A review of ten emerging protein sources, quinoa among them, found antinutritional factors, phytoestrogens and oligosaccharides in every source examined, and allergenic properties in all of them, either intrinsic or through cross reaction. The same review says no conclusive data exist to assess their safety after processing in any quantitative way, and it gives no number for quinoa by itself. Read it as a reason to stop assuming quinoa is hypoallergenic. That review does not cover millet, and we found nothing on the tolerability of millet itself, so this section speaks for quinoa and not for the pair. Two trials in the groups people ask about most both used something other than the grain from a shop. In 223 children aged 12 to 18 months in Mumbai slums, 9 months of iron and zinc biofortified pearl millet raised hemoglobin by 0.10 g/dL while conventional millet gave a fall of 0.15 g/dL. Serum ferritin, plasma zinc and growth did not change, and the variety was a bred one rather than millet from a shop. In 75 postpartum mothers in northern Ghana, a drink that was 74 percent millet, 25 percent soya and 1 percent ginger raised breast milk volume by 1.7 tbsp (24.9 mL) and prolactin by 25.0 ng/mL by day 14. That was 25 women per arm, with no blinding and no way to separate the millet from the soya. Nobody has published data on interactions with medicines for either grain. The adult evidence on millet, blood sugar and blood fats rests on six studies in total, one of them a randomized controlled trial.

Sources

1. mlqn-daily-r2-15 · reference dataset
   Quinoa, raw | CoFID 14-843 | Energy 309 kcal | Protein 13.8 g | Fat 5.0 g | AOAC fibre 7.0 g | Iron 7.80 mg | Magnesium 210 mg | Zinc 3.3 mg || Flour, millet, foxtail | CoFID 11-016 | Energy 354 kcal | Protein 5.8 g | Fat 1.7 g | Calcium 40 mg | Phosphorus 260 mg | Thiamin 0.68 mg
   CoFID 2021, Public Health England, codes 14-843 and 11-016 · checked 2026-09-25
2. mlqn-daily-r2-17 · reference dataset
   Millet | FNDDS 56202000 | fdc_id 2708377 | 1 cup, cooked 10043 = 170 g | 1 cup, dry, yields 10074 = 760 g | 1 oz, dry, yields 40049 = 110 g || Quinoa, no added fat | FNDDS 56204005 | fdc_id 2708400 | 1 cup, cooked 10043 = 170 g
   USDA FNDDS, Millet food code 56202000 and Quinoa no added fat food code 56204005 · checked 2026-09-25
3. mlqn-daily-r2-06 · in vitro
   Eight in-vitro studies showed that traditional processing methods such as fermentation and germination can improve bioavailable iron significantly (p < 0.01) by 3.4 and 2.2 times and contributed to 143 and 95% of the physiological requirement of women, respectively.
   Front Nutr, 2021 · checked 2026-09-25
4. mlqn-daily-r2-07 · absorption study
   Two studies conducted on humans demonstrated that consumption of a pearl millet-based meal significantly increased the bioavailable iron (p < 0.01), with the percentage of bioavailability being 7.5 ± 1.6, and provided bioavailable iron of 1 ± 0.4 mg.
   Front Nutr, 2021 · checked 2026-09-25
5. mlqn-daily-r2-08 · randomized crossover trial
   In both trials, traditional sorghum and millet foods (thick porridges and millet couscous) had gastric half-emptying times about twice as long as rice, potato, or pasta (p < 0.0001).
   Nutrients, 2018 · checked 2026-09-25
6. mlqn-daily-r2-16 · reference dataset
   RICE,WHITE/BROWN,COOKED,WATER USED | Cereal Grains and Pasta (20) | Retn_Code 432 | folate_total_ug 70% | thiamin_mg 80% | riboflavin_mg 90% | iron_mg 95% | zinc_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, code USDA-RETN-R6:432 · checked 2026-09-25
7. mlqn-daily-r2-01 · meta-analysis of RCTs
   In comparison between quinoa seed supplementation and placebo, 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 2026-09-25
8. mlqn-daily-r2-02 · 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), waist circumference (WC) (WMD: -1.15 cm, 95% CI: -2.08, -0.21, p = .01), fat mass (FM) (WMD: -0.59%, 95% CI: -1.14, -0.03, p = .03), insulin serum level (WMD: -0.86 pmol/L, 95% CI: -13.38, -1.59, p = .01), triglyceride (TG) (WMD: -7.20 mg/dl, 95% CI: -9.52, -4.87, p < .001), total cholesterol (TC) (WMD: -6.86 mg/dl, 95% CI: -10.64, -3.08, p < .001), and low density lipoprotein (LDL) (WMD: -3.08 mg/dl, 95% CI: -5.13, -1.03, p = .003) levels.
   Phytother Res, 2021 · checked 2026-09-25
9. mlqn-daily-r2-05 · meta-analysis of RCTs
   Thirteen published studies featuring randomized control trials involving 590 individuals in the intervention group and 549 control individuals were eligible for the meta-analysis. The difference-in-differences analysis revealed highly significant (p < 0.01) positive effects of millet consumption on hemoglobin concentration, with an effect size of +0.68 standardized mean difference units.
   Front Nutr, 2024 · checked 2026-09-25
10. mlqn-daily-r2-12 · systematic review
    The findings identified potential concerns associated with the presence of plant secondary metabolites, including antinutritional factors, phytoestrogens, and oligosaccharides, in all the sources included. Also, these protein sources have been shown to display allergenic properties, either through the intrinsic presence of allergens or through cross-reaction.
    Compr Rev Food Sci Food Saf, 2025 · checked 2026-09-25
11. mlqn-daily-r2-09 · randomized crossover trial
    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 2026-09-25
12. mlqn-daily-r2-13 · regulatory register
    POL-HC-6967 Combination of millet extract + L-cystine + vitamin B5 (calcium panthothenate) Supports healthy hair growth from within. Supports the growth of healthy hair & nails. Supports metabolism of the hair roots. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6967, snapshot 2026-09-21 · checked 2026-09-25
13. mlqn-daily-r2-14 · regulatory register
    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 2026-09-25
14. mlqn-daily-r2-03 · meta-analysis of RCTs
    Results from the randomized effect model showed a significant effect (p < 0.05) of millet-based diets on mean height (+28.2%) (n = 8), weight (n = 9) (+26%), mid upper arm circumference (n = 5) (+39%) and chest circumference (n = 5) (+37%) in comparison to regular rice-based diets over for the period of 3 months to 4.5 years, which was based on largely substituting rice with millets.
    Nutrients, 2022 · checked 2026-09-25
15. mlqn-daily-r2-10 · randomized trial
    Consumption of FeZnPM increased hemoglobin concentration compared to CPM [change over time: 0.10 g/dL (-0.60, 0.90) vs. CPM: -0.15 g/dL (-1.00, 0.40) P = 0.04].
    Clin Nutr, 2026 · checked 2026-09-25
16. mlqn-daily-r2-11 · randomized trial
    The Zim-So drink group demonstrated the largest effect size, with mean breast milk volume increasing by 24.9 mL (95% CI, 22.1-27.7) and prolactin levels by 25.0 ng/mL (95% CI, 22.0-28.0) at Day 14 compared to the control (p < 0.001), indicating a stronger and sustained impact on lactation outcomes.
    Int Breastfeed J, 2025 · checked 2026-09-25
17. mlqn-daily-r2-04 · meta-analysis of RCTs
    The DID was positive and significant (p < 0.05) with high heterogeneity (I2 = 94%) among studies and a pooled SMD of 2.92 (95% CI 0.23–5.62). The mean height increase was 28.2% higher in the intervention group than in the control group.
    Nutrients, 2022 · checked 2026-09-25
18. mlqn-daily-r2-18 · systematic review
    One randomized-controlled study, three randomized-crossover studies, and two non-randomized studies were included. ... Future well-controlled trials on subjects from multiple ethnicities are needed for generating robust and actionable evidence of the role of millet consumption on metabolic health.
    Diabetes Metab Syndr, 2026 · checked 2026-09-25