Sorghum: a grain with few human trials

Sorghum is often sold as a better grain than wheat or rice, and the human evidence behind that is thin. A 2016 systematic review found only 19 human studies of people eating it. A 2024 review of its plant compounds counted 7 human studies out of 49, and those gave mixed results on blood sugar and blood fats. Most of the trials on this page did not test a plate of cooked sorghum grain. They tested a pasta made with 30 percent red sorghum flour, a drink made from extruded sorghum, or a fortified test meal with its phytate removed, so what they found belongs to those products. In 20 healthy adults the sorghum pasta gave a smaller rise in blood sugar after breakfast than durum wheat pasta, and people ate about 794 kJ less at lunch. That was one meal. The largest study here is a meta-analysis of 13 randomised trials in which hemoglobin rose 13.6 percent in the millet groups against 4.8 percent in controls. Sorghum was pooled in it with other millets, so the result is for millets as a group.

The numbers, per 100 g

What your body absorbs

• In 50 young women, iron absorption from a fortified sorghum meal fell from 8.5% with low-polyphenol sorghum to 2.7% with high-polyphenol brown sorghum, and adding ascorbic acid raised it to 13.6%. — 50 young women, dephytinised iron-fortified white and brown sorghum test meals, stable isotope absorption (n = 50) Evidence B source
  Iron absorption 8.5% (17 mg polyphenols) vs 3.2% (73 mg) vs 2.7% (167 mg); with ascorbic acid 13.6%
• In 5 healthy young men, lysine from moist-cooked sorghum was 94% bioavailable, and pairing sorghum with lentils cut indicator oxidation by 19%, meaning more usable lysine. — 5 healthy young men, 8 randomly ordered determinations each; sorghum cooked by a moist method (n = 5) Evidence B source
  Lysine bioavailability 94%; phenylalanine oxidation -19% with sorghum plus lentils (P < 0.0495)

What cooking and storage change

• A systematic review of 22 animal studies found that sorghum's gut effects depended on genotype, grain fraction and processing such as refining, extrusion and fermentation. — 22 in vivo animal studies (n = 22 studies) Evidence D source
  Direction depends on genotype, fraction and processing; not quantified

What it does to your health

• In a meta-analysis of 13 randomised trials of millets including sorghum (1,139 people), hemoglobin rose 13.6% in the millet groups against 4.8% in controls, a standardised mean difference of +0.68. — Children and adults in 13 randomised trials, 590 intervention and 549 control participants; sorghum pooled with other millets (n = 1139) Evidence A source
  Hemoglobin +13.6% vs +4.8%; SMD +0.68 (p < 0.01)
• Pasta made with 30% red sorghum flour lowered the 2-hour blood glucose response (iAUC by 36 mmol/l x min) and cut energy intake at the next meal by about 794 kJ compared with durum wheat pasta in 20 healthy adults. — 20 healthy adults, single breakfast test meals with 50 g available carbohydrate (n = 20) Evidence B source
  Glucose iAUC -36.11 mmol/l x min (95% CI -67.11 to -5.11); lunch energy intake -794 kJ (95% CI -1275 to -314)
• In a crossover trial with 14 volunteers in Mali, traditional sorghum and millet porridges took about twice as long to half-empty from the stomach as rice, potato or pasta. — 14 healthy volunteers in Bamako, Mali, eight starchy staples; validation study with 6 volunteers (n = 14) Evidence B source
  Gastric half-emptying time about 2x longer (p < 0.0001)
• In 51 overweight adults on a 500 kcal deficit diet for 10 weeks, a daily extruded sorghum drink lowered insulin, triglycerides and HOMA-IR within its group and increased HDL cholesterol at the endpoint. — 51 overweight adults, 25 sorghum drink and 26 control drink, daily for 10 weeks with a hypocaloric diet (n = 51) Evidence B source
  Within-group falls in insulin, triglycerides, HOMA-IR; higher HDL-c at endpoint; sizes not given in abstract
• In an acute crossover trial with 14 normoglycaemic adults, a germinated extruded sorghum drink raised GLP-1 and lowered the insulin response and hunger compared with a control drink. — 14 normoglycaemic adults, single test drink (n = 14) Evidence B source
  Higher GLP-1, lower insulin iAUC and hunger; sizes not given in abstract

Safety, limits and interactions

• In a survey of smallholder sorghum farmers in one district of Ethiopia, only 5% used any measure to reduce mycotoxin contamination of stored grain and 2% knew molds harm humans and animals. — Smallholder farmers storing sorghum, Dejen District, Ethiopia Evidence C source
  5% applied preventive measures; 2% knew molds harm humans and animals

What people believe that the data does not support

• A 2016 systematic review found only 19 human studies on eating sorghum, so the idea that it beats other staple grains rests on thin evidence, especially for people outside traditional sorghum-eating regions. — 19 human studies, 13 interventional and 6 observational, 1985-2015 (n = 19 studies) Evidence C source
  Signals for lower blood glucose response and oxidative stress markers; no pooled estimate

Who this works differently for

• In a randomised crossover study of 10 young and 10 older adults, lysine and threonine uptake from sorghum protein was 19% lower in the older group, while milk and black beans showed no age difference. — 10 young (mean 21.8 y) and 10 older (mean 72.8 y) adults, 20 g labelled protein per test (n = 20) Evidence B source
  Plasma-to-meal isotope ratio -19% in older adults for sorghum (P = 0.041)

What is still unknown

• In a single-arm trial without a control group, 9 Japanese adults with a visceral fat area of 100 cm2 or more who ate 80 g of dry sorghum a day for 12 weeks had lower visceral fat area, a signal that still needs a randomised trial. — 9 completers aged 20-60 with visceral fat area of 100 cm2 or more (n = 9) Evidence C source
  Visceral fat area decreased (p = 0.02); 8 of 9 reduced
• Of 49 studies in a 2024 systematic review of sorghum phytonutrients, only 7 were in humans, and those gave mixed results on glucose and lipid metabolism. — 22 cell, 20 animal and 7 human studies (n = 49 studies) Evidence C source
  Human results mixed; no pooled estimate

The bottom line

If you count on sorghum for iron, polyphenol content matters. In this study the low-polyphenol sorghum was white and the high-polyphenol one brown. In 50 young women, iron absorption from a fortified sorghum meal was 8.5 percent with low-polyphenol white sorghum and 2.7 percent with high-polyphenol brown sorghum. Adding vitamin C (ascorbic acid) lifted it to 13.6 percent. Those meals had their phytate taken out, and ordinary meals still contain it. The hemoglobin meta-analysis at the top of this page pooled sorghum with other millets, so it does not show what sorghum does on its own. In 5 young men, 94 percent of the lysine in moist-cooked sorghum was available to the body. Lysine is one of the building blocks of protein, and eating sorghum with lentils made more of that lysine usable. Age changes this. In 10 older adults, uptake of lysine and threonine from sorghum protein was 19 percent lower than in 10 young adults, while milk and black beans showed no gap by age. In Mali, traditional thick sorghum and millet porridges took about twice as long to half-empty from the stomach as rice, potato or pasta in 14 volunteers. The sorghum drink trials are harder to read. In 51 overweight adults eating 500 kcal a day below their needs for 10 weeks, insulin, triglycerides and insulin resistance fell in the drink group, measured mostly against its own starting point, and the abstract gives no sizes. In the drink group HDL cholesterol had gone up by the end. A single test in 14 adults found more of the gut hormone GLP-1, less insulin and less hunger after a germinated sorghum drink. Nine Japanese adults who started with a lot of visceral fat, the fat around the organs (a visceral fat area of 100 cm2 or more), ate 80 g of dry sorghum a day for 12 weeks, and that fat went down. There was no control group, so this is a signal still waiting for a randomised trial. In 22 animal studies, what sorghum did in the gut depended on the variety, the part of the grain and the processing, whether refined, extruded or fermented. Our one safety card is about storage. Among smallholder farmers storing sorghum in one district of Ethiopia, only 5 percent did anything to keep mould toxins out of stored grain, and 2 percent knew that moulds can harm people. That is a picture of one farming community and says nothing about the bag in your shop. Who should be careful with sorghum is a gap on this page. We have no card on allergy, medicines, pregnancy, children or kidney disease, and none on whether it suits people who must avoid gluten, so we make no claim on any of them. Ask your doctor or dietitian if one of those applies to you.

Sources

1. srg-b4-03 · randomised crossover trial
   Fe absorption from meals with 17 mg PP (8·5%) was higher than that from meals with 73 mg PP (3·2%) and 167 mg PP (2·7%; P< 0·001). ... whereas adding AA increased absorption to 13·6% (P< 0·001).
   Br J Nutr, 2014 · checked 2026-09-23
2. srg-b4-04 · clinical trial, randomised order
   The bioavailability of lysine from sorghum was 94%. Upon complementation with lentils, there was a decline in the oxidation of L-[1-13C] phenylalanine by 19% (P < 0.0495)
   J Nutr, 2022 · checked 2026-09-23
3. srg-b4-10 · systematic review of animal studies
   This systematic review analyzed 22 in vivo studies to assess the effects of sorghum processing on bioactive compounds and their effects on intestinal health. ... These benefits appear to be influenced by sorghum genotype, grain fraction, and processing method, like refinement, extrusion, and fermentation, which affect the bioavailability of phenolics.
   Crit Rev Food Sci Nutr, 2026 · checked 2026-09-23
4. srg-b4-01 · 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 change in hemoglobin concentration observed in the intervention group was +13.6%, which is statistically significant (p < 0.0005), compared to that in the control group, which was +4.8% and not statistically significant (p = 0.1362).
   Front Nutr, 2024 · checked 2026-09-23
5. srg-b4-02 · randomised crossover trial
   healthy individuals (n = 20) consumed the following three iso-caloric test meals (each providing 50 g available carbohydrates) as breakfast ... glucose iAUC over 120 min (-36.11 ± 10.53 mmol/l × min; 95% CI: -67.11 ~ -5.11; P = 0.017) compared to CP meal. ... Energy intake at ad libitum lunch was significantly lower after the RSP meal than after the CP meal (-794.17 ± 163.25 kJ; 95% CI: -1274.77 ~ -313.57; P = 0.001).
   Eur J Clin Nutr, 2025 · checked 2026-09-23
6. srg-b4-06 · randomised 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 2026-09-23
7. srg-b4-07 · randomised controlled trial
   51 overweight adults of both sexes, were assigned to consume a sorghum beverage (SG, n = 25) or a control beverage (CG, n = 26), daily for 10 weeks, alongside a personalized hypocaloric diet (-500 kcal). ... SG decreased insulin, triglycerides, HOMA-IR, and TyG index intra-group, maintaining body fat percentage; increased HDL-c and decreased Castelli I index at the endpoint
   Eur J Nutr, 2026 · checked 2026-09-23
8. srg-b4-08 · randomised crossover trial
   an acute trial was conducted with 14 normoglycemic individuals ... The sorghum beverage increased GLP-1 and decreased the incremental area under the curve of insulin and the feeling of "hunger"
   J Am Nutr Assoc, 2026 · checked 2026-09-23
9. srg-b4-13 · cross-sectional survey
   Similarly, 2% of the respondents knew that molds are harmful to humans and animals. Only 5% of the farmers applied preventive measures to reduce mycotoxin contamination in stored grains.
   Mycotoxin Res, 2025 · checked 2026-09-23
10. srg-b4-11 · systematic review, no meta-analysis
    Nineteen studies -13 interventional and 6 observational - were identified for inclusion. ... More work is required to elucidate the health effects of sorghum when consumed by population groups that have not been traditional consumers of the grain.
    Nutr Rev, 2016 · checked 2026-09-23
11. srg-b4-05 · randomised crossover trial
    The isotope plasma-to-meal ratio for lysine and threonine was 19% lower in older adults compared with young adults for sorghum (P = 0.041), whereas it was not significantly different for milk (P = 0.277) and black beans (P = 0.849).
    Am J Clin Nutr, 2026 · checked 2026-09-23
12. srg-b4-09 · single-arm trial
    Participants consumed cooked sorghum (80 g/day, dry weight) for 12 weeks. ... Nine participants completed the study. VFA significantly decreased after 12 weeks of sorghum consumption (p = 0.02).
    Nutrients, 2026 · checked 2026-09-23
13. srg-b4-12 · systematic review
    analyzing cell (n = 22), animal (n = 20), and human (n = 7) studies ... Translating these findings to human scenarios requires caution, especially considering cell studies do not fully represent polyphenol metabolism. Human studies provided mixed results, indicating antioxidant and potential anti-inflammatory benefits and nuanced effects on glucose and lipid metabolism.
    J Food Sci, 2024 · checked 2026-09-23