Beans or chickpeas: where the trials tell them apart

Beans and chickpeas have been fed head to head exactly once in our corpus. In 12 healthy women eating rice with either black beans or chickpeas, both lowered blood glucose at 60 and 90 minutes against rice alone, and only the black bean meal was still lower at two hours. Everything else on this page treats them as one family, pulses, because that is how the trials were run. Pooled across 38 trials, about 130 g of whole pulses a day for six weeks lowered LDL cholesterol by 0.14 mmol/L, and results were similar across pulse types. One difference did show up. A dose response up to a cup a day was found for beans and could not be shown for chickpeas, and the authors of that analysis ask for chickpea trials. On glucose, chickpeas have a meta-analysis of their own, 28 feeding studies. The post-meal glucose curve came down by about 48 units against carbohydrate-matched foods. Those units are pooled across studies that measured on different scales, so the figure does not convert into a blood sugar reading. Peak glucose did not move and neither did insulin, and the reviewers rated their own certainty very low because the studies disagreed with each other. So the effect is on the shape of the curve. The peak stays where it was.

How much is actually in it

• Measured in 18 adults with full faecal and urine collection, a 85.5 g serving of chickpeas delivered 123 kcal, which is 10.4 percent less than the Atwater general factors on the label predict. — 18 adults, randomised controlled crossover feeding study, 10-day adaptation then 7-day complete faecal and urine collections (n = 18) Evidence B source
  Chickpea metabolizable energy 515 +/- 17 kJ (123 +/- 4 kcal) per 85.5 g serving, 10.4% below Atwater general (p = 0.002) and 8.0% below Atwater specific factors (p = 0.02)
• Dry chickpeas carry about 5.1 mg iron per 100 g across eight USDA samples, canned drained chickpeas about 1.0 mg, and canned drained black beans about 1.7 mg, while one cup of cooked chickpeas weighs 180 g. — USDA Foundation Foods release 2026-04-30 (8 samples per product), CoFID 2021, FNDDS 2021-2023 portion weights (n = 8 samples per USDA product) Evidence E source
  USDA iron per 100 g: chickpeas dry 5.094 mg (4.14 to 5.91, spread 35%), chickpeas canned drained 1.042 mg (0.804 to 1.4, spread 57%), black beans canned drained 1.688 mg (1.46 to 2.15); CoFID Kabuli chickpeas dried raw 5.50 mg and canned drained 1.9 mg; FNDDS 1 cup chickpeas 180 g

What a real portion looks like

• The 2025 Dietary Guidelines Advisory Committee raised beans, peas and lentils by 0.5 to 1 cup equivalent per week across calorie levels for everyone aged 2 and older, to a maximum of 3 cup equivalents per week. — US population aged 2 years and older, modelled dietary patterns at 1000 to 2800 kcal Evidence E source
  Weekly beans, peas and lentils increased by 0.5 cup eq at 1000, 1200, 2600 and 2800 kcal and by 1.0 cup eq at 1400 to 2400 kcal, capped at 3 cup eq per week

What your body absorbs

• In 12 healthy women, swapping part of a 50 g carbohydrate rice meal for black beans or for chickpeas lowered blood glucose at 60 and 90 minutes compared with rice alone, and the black bean meal stayed lower at 120 minutes. — 12 healthy adult women aged 18 to 65, three test breakfasts at least 7 days apart, capillary glucose and insulin over 120 minutes (n = 12) Evidence B source
  Glucose iAUC differed by treatment (p = 0.027); black beans and chickpeas both lower than rice at 60 min (p = 0.026 and 0.024) and 90 min (p = 0.001 and 0.012); at 120 min only the black bean meal (p = 0.024)

What cooking and storage change

• For legumes boiled 2 to 2.5 hours and drained, the USDA retention table keeps only 30 percent of folate and 40 percent of thiamin, while iron keeps 75 percent and zinc 85 percent. — USDA Table of Nutrient Retention Factors Release 6 (2007), group Legumes and Legume Products, method code 541 (n = group factor, table dated Sep-75) Evidence E source
  Retained: folate 30%, thiamin 40%, vitamin B6 50%, copper 55%, potassium 65%, magnesium 70%, iron 75%, phosphorus 80%, calcium 85%, zinc 85%

What it does to your health

• Pooling 28 controlled feeding studies, chickpeas cut the post-meal glucose area under the curve by about 48 units against carbohydrate-matched controls, with no effect on peak glucose or on insulin, and the certainty was rated very low. — 28 acute controlled feeding studies (40 comparisons) in adults, chickpea meals versus carbohydrate-matched control foods (n = 28 studies) Evidence A source
  Glucose iAUC MD -47.89 (95% CI -64.20 to -31.58); glucose Cmax MD -0.23 (95% CI -1.48 to 1.02, ns); insulin iAUC ns
• Across 9 acute feeding trials, a meal containing beans, peas, chickpeas or lentils raised the satiety area under the curve by 31 percent compared with an isocaloric meal without pulses, but people did not eat less at the next meal. — 9 acute controlled feeding trials in adults, pulse meals versus isocaloric control meals, searched through May 2013 (n = 9 trials) Evidence A source
  Satiety iAUC ratio of means 1.31 (95% CI 1.09 to 1.58, P = 0.004, I2 = 0%); second-meal intake MD -19.94 kcal (95% CI -75 to 35, ns)
• In 21 randomised trials with 940 participants, diets with about one serving of pulses a day (median 132 g) produced 0.34 kg more weight loss over a median of 6 weeks than diets without pulses, even when calories were not restricted. — 940 adults in 21 randomised controlled trials of at least 3 weeks, searched through May 2015 (n = 940) Evidence A source
  Weight change -0.34 kg (95% CI -0.63 to -0.04, P = 0.03); body fat percentage possibly lower in 6 trials

Safety, limits and interactions

• Eating 200 g of canned chickpeas a day for three weeks raised self-rated flatulence from 0.4 to 1.0 on a 0 to 3 scale in 12 healthy adults, with no change in stool frequency, diarrhoea or abdominal pain. — 12 healthy adults, random crossover, 3 weeks each on control foods, control plus 5 g raffinose, or 200 g canned chickpea per day (11 g fibre) (n = 12) Evidence B source
  Flatulence 1.0 +/- 0.2 vs 0.4 +/- 0.1 (P < 0.001); bloating 0.2 vs 0.0 (P < 0.001); stool frequency 1.7 vs 1.5 per day (ns)
• A 65-year-old woman reacted with urticaria, angioedema and dyspnoea to lentils, beans, chickpeas and soya while tolerating peanuts, and the authors note that lentils cross-react with chickpeas and beans and that legumes are the fifth most common food allergy in Spanish children under 5. — single adult patient, Latin America, 20-year history, prick-to-prick tests chickpea 5 mm, bean 7 mm, lentil 6 mm (n = 1) Evidence D source
  Anaphylaxis to several legumes with peanut tolerance; cross-reactivity between lentil, chickpea and bean reported
• A scoping review found 47 studies on chickpea, pea, lentil and lupine allergy, nearly all on prevalence and mostly European, and none on labelling or education, so the size of the chickpea allergy problem outside Europe is unknown. — 47 original studies out of 8976 titles screened, mainly prevalence studies from Europe, some from Asia and North America (n = 47 studies) Evidence C source
  Evidence limited to prevalence; burden, labelling and education unstudied

What people believe that the data does not support

• In a meta-analysis of 12 randomised trials with 182 mostly normoglycaemic adults, chickpeas lowered the blood glucose area under the curve compared with potatoes and wheat, while the insulin benefit varied in significance. — 182 healthy or normoglycaemic adults in 12 randomised controlled trials, chickpeas versus wheat, potatoes, pasta, rice, corn and other foods (n = 182) Evidence A source
  Lower glucose iAUC versus potatoes and wheat in the pooled subset; insulin effects inconsistent
• In a systematic review of 40 acute feeding studies, non-oil-seed pulses gave a lower glucose response than wheat or rice controls in 28 of 40 studies and a lower insulin response in 16 of 24, but only 1 of 6 studies found greater satiety. — 40 human intervention studies of acute postprandial responses to pulses and pulse products, PubMed, Cochrane and Scopus (n = 40 studies) Evidence A source
  Lower glucose in 28/40 studies, lower insulin in 16/24, reduced hunger in 3/5, greater satiety in 1/6, greater fullness in 3/6
• The EU register holds no authorised health claim naming beans or chickpeas, and the 11 bean entries are all non-authorised, including a product claim that lentil and bean shoots naturally boost the digestive system. — EU Register on nutrition and health claims, snapshot 2026-09-21, 2330 claims, 262 authorised and 2067 non-authorised (n = 11 bean entries, 0 chickpea entries) Evidence E source
  Status Non-authorised

Who this works differently for

• In 87 adults of mean age 60 who completed a crossover trial, two daily servings of beans, chickpeas, peas or lentils for 2 months lowered total cholesterol by 8.3 percent and LDL cholesterol by 7.9 percent compared with their usual diet. — 108 randomised, 87 completers (30 men, 57 women, mean age 59.7), pulse foods about 150 g/d dry weight for 2 months, 1 month washout, crossover (n = 87) Evidence B source
  Total cholesterol -8.3% (4.57 to 4.11 mmol/L vs 4.47 to 4.39, P < 0.001); LDL-C -7.9% (2.93 to 2.55 vs 2.96 to 2.81, P = 0.01)
• In 121 people with type 2 diabetes, adding at least 1 cup of beans, chickpeas or lentils a day for 3 months lowered HbA1c by 0.5 percentage points, 0.2 points more than a high wheat fibre diet. — 121 adults with type 2 diabetes, randomised to a low-GI legume diet or a high wheat fibre diet for 3 months (n = 121) Evidence B source
  HbA1c -0.5% (95% CI -0.6 to -0.4) on legumes vs -0.3% (95% CI -0.4 to -0.2) on wheat fibre; difference -0.2% (95% CI -0.3 to -0.1, P < .001); systolic BP -4.5 mm Hg relative

What is still unknown

• Across 38 trials with 2095 participants, about 130 g of whole pulses a day for 6 weeks lowered LDL cholesterol by 0.14 mmol/L. Results were similar across pulse types, and a dose-response up to 1 cup a day was shown only for beans. — 2095 adults in 38 randomised trials (52 comparisons) of at least 3 weeks, searched through March 2025 (n = 2095) Evidence A source
  LDL-C mean difference -0.14 mmol/L (95% CI -0.19 to -0.08); non-HDL-C -0.22 mmol/L; beans dose-response -0.25 mmol/L per 0.5 cup (95% CI -0.48 to -0.02)
• In 7216 older Mediterranean adults followed for 6 years, the highest tertile of dry bean intake was associated with a 2.2 times higher risk of cardiovascular death. Total legumes and lentils were associated with 49 and 37 percent lower cancer mortality. — 7216 PREDIMED participants aged 55 to 80 at high CVD risk, Spain, median follow-up 6.0 years, 425 deaths (n = 7216) Evidence C source
  CVD mortality HR 2.23 (95% CI 1.32 to 3.78) for top tertile of dry beans; cancer mortality HR 0.51 (0.31 to 0.84) for total legumes and 0.63 (0.40 to 0.98) for lentils

The bottom line

Where they differ in the kitchen matters more than where they differ in the trials. Iron is the clearest case. Dry chickpeas carry about 5.1 mg per 100 g across eight USDA samples, canned drained chickpeas about 1.0 mg, and canned drained black beans about 1.7 mg. The gap between the dry figure and the canned one is mostly water, not iron lost in the can. A cup of cooked chickpeas weighs 180 g. For legumes boiled two to two and a half hours and drained, the USDA retention table keeps 75 percent of the iron and 85 percent of the zinc. Folate keeps only 30 percent and thiamin 40 percent, so the long boil costs you the B vitamins far more than the minerals. That table is a group figure for all legumes, dated 1975, and no retention factor exists for chickpeas on their own. Whether iron from chickpeas is absorbed differently from iron in beans has been tested in no trial we could find. The energy on the label runs high. In 18 adults measured with complete faecal and urine collection, an 85.5 g serving of chickpeas delivered 123 kcal, 10.4 percent less than the Atwater factors on the label predict. Fullness is real and short. Across 9 feeding trials a pulse meal raised satiety by 31 percent, and people did not eat less at the next meal. Over 21 trials with 940 people, about a serving a day added 0.34 kg of weight loss over a median of six weeks, a small effect that held even when calories were not restricted. In 87 adults of average age 60, two servings a day for two months cut total cholesterol by 8.3 percent and LDL by 7.9 percent. In 121 people with type 2 diabetes, at least a cup a day for three months lowered HbA1c by 0.5 points against 0.3 on a high wheat fibre diet. If you take medication for diabetes, that change lands on top of it, so it belongs in a conversation with whoever prescribes it. The gut complaint has been measured. 200 g of canned chickpeas a day for three weeks moved self-rated flatulence from 0.4 to 1.0 on a 0 to 3 scale in 12 adults, with no change in stool frequency, diarrhoea or abdominal pain. Two things sit on the other side of the ledger. In 7216 older Spanish adults at high heart risk, the top third for dry bean intake had a 2.2 times higher rate of cardiovascular death over six years. In the same people, total legumes and lentils went with 49 and 37 percent lower cancer death. That is one observational cohort, and the trials above measured cholesterol and glucose rather than deaths, so nobody can say yet whether the bean finding is cause or coincidence. We leave it standing because it is the only mortality data on this page. Allergy is the other. A 65 year old woman reacted to lentils, beans, chickpeas and soya while tolerating peanuts. The report of her case notes that lentils cross-react with chickpeas and beans, and that legumes are the fifth most common food allergy in Spanish children under five. A scoping review of 47 studies found almost nothing beyond prevalence, mostly in Europe, so how common chickpea allergy is elsewhere is unknown. If you react to one legume, treat the others as a question for an allergist. Beyond allergy and the gas, this page has no safety data at all: nothing on an upper limit, nothing on drugs, nothing on pregnancy. That is a gap in our research, and silence here is a missing card rather than proof of safety. The EU register holds no authorised health claim for beans or chickpeas, and all 11 bean entries were refused, including one for shoots said to naturally boost the digestive system. The 2025 US advisory committee went the other way on the plate and raised its weekly target for beans, peas and lentils by half a cup to a cup, up to a ceiling of 3 cup equivalents a week. We have no USDA composition entry for this pairing in this cohort, so the numbers above come from the eight-sample Foundation rows on the cards.

Sources

1. bch-c5-08 · randomised crossover trial
   The metabolizable energy (ME) of the chickpeas is 515 ± 17 kJ/serving (123 ± 4 kcal/serving) (serving mass = 85.5 g), which is 10.4% lower (p = 0.002) and 8.0% lower (p = 0.02) than the ME calculated using Atwater General or Specific Factors, respectively.
   Nutrients, 2025 · checked 2026-09-23
2. bch-c5-15 · reference dataset
   USDA Foundation: Chickpeas, (garbanzo beans, bengal gram), dry, Iron 5.094 mg, range 4.14-5.91, n=8 || Chickpeas canned, Iron 1.042 mg, range 0.804-1.4, n=8 || Beans, black, canned, sodium added, drained, Iron 1.688 mg, range 1.46-2.15, n=8 || CoFID 13-074 Beans, chick peas, Kabuli, whole, dried, raw, Iron 5.50 mg, Protein 21.3 g, Folate 180 ug || CoFID 13-670 Beans, chick peas, canned, re-heated, drained, Iron 1.9 mg, Protein 8.4 g, Folate 35 ug || FNDDS 2707418 Chickpeas, from canned, no added fat, 1 cup = 180 g
   USDA FoodData Central Foundation Foods 2026-04-30; CoFID 2021, Public Health England / OGL v3.0; FNDDS 2021-2023 · checked 2026-09-23
3. bch-c5-18 · dietary guidelines report
   Beans, Peas, and Lentils were increased across calories levels in the modified 2020 HUSS for ages 2 years and older, with a 0.5 cup equivalent per week increase in the 1,000-, 1,200-, 2,600-, and 2,800-calorie levels and a 1.0 cup equivalent per week increase in 1,400- to 2,400-calorie levels. ... The quantities were increased to a maximum of 3 cup equivalents per week, as this level approaches the 95th percentile of intake in the population.
   Scientific Report of the 2025 Dietary Guidelines Advisory Committee, Part D Chapter 10, 2024 · checked 2026-09-23
4. bch-c5-02 · randomised crossover trial
   This randomized cross-over study examined the glycemic and insulinemic impact of 50 grams of available carbohydrate from three test meals: plain white rice (control), black beans with rice, and chickpeas with rice among healthy adult women (n = 12, 18-65 years). ... Changes in blood glucose concentrations were significantly different for the black bean meal and the chickpea meal in comparison to rice alone at 60 min (p = 0.026 and p = 0.024), 90 min (p = 0.001 and p = 0.012) and 120 min post prandial (p = 0.024; black bean meal).
   Nutrients, 2017 · checked 2026-09-23
5. bch-c5-16 · reference dataset
   USDA-RETN-R6:541 LEGUMES,CKD 2/2.5HRS,BOILED,DRAINED: folate_total_ug 30% · thiamin_mg 40% · vitamin_b6_mg 50% · copper_mg 55% · niacin_mg 55% · potassium_mg 65% · magnesium_mg 70% · iron_mg 75% · riboflavin_mg 75% · phosphorus_mg 80% · calcium_mg 85% · zinc_mg 85%
   USDA Table of Nutrient Retention Factors, Release 6 (2007) · checked 2026-09-23
6. bch-c5-03 · meta-analysis of controlled trials
   Chickpea consumption significantly reduced postprandial glucose iAUC compared to carbohydrate-matched controls (MD: -47.89, 95% CI: -64.20, -31.58, p < 0.0001). ... The GRADE assessment indicated very low certainty for glucose iAUC due to heterogeneity.
   Nutr J, 2025 · checked 2026-09-23
7. bch-c5-05 · meta-analysis of acute feeding trials
   Dietary pulses produced a 31% greater satiety incremental area under the curve (IAUC) (RoM = 1.31, 95% CI: 1.09 to 1.58, P = 0.004 ... Pooled analyses show that dietary pulses contribute to acute satiety but not second meal intake.
   Obesity (Silver Spring), 2014 · checked 2026-09-23
8. bch-c5-06 · meta-analysis of RCTs
   The pooled analysis showed an overall significant weight reduction of -0.34 kg (95% CI: -0.63, -0.04 kg; P = 0.03) in diets containing dietary pulses ... compared with diets without a dietary pulse intervention over a median duration of 6 wk.
   Am J Clin Nutr, 2016 · checked 2026-09-23
9. bch-c5-07 · randomised crossover trial
   Using a random crossover design, healthy adults (n = 12) received control foods, control foods with 5 g raffinose, and foods with 200 g of canned chickpea (11 g fibre per day), each for three weeks following a 3-day diet rotation. ... Reported flatulence (mean ± SD) was rated higher with chickpea (1.0 ± 0.2, P < 0.001) and raffinose (0.7 ± 0.2, P < 0.001) compared with control (0.4 ± 0.1). ... No differences were found for diarrhea or abdominal pain.
   Can J Diet Pract Res, 2014 · checked 2026-09-23
10. bch-c5-12 · case report
    In the Mediterranean region and India, lentils, chickpeas and peas have been considered important allergens and legumes have been reported to represent the fifth most common cause of food allergy in children under 5 years of age in Spain. ... A high degree of cross-reactivity among legumes has been reported. Lentils have cross-reactivity with chickpeas and beans.
    Rev Alerg Mex, 2024 · checked 2026-09-23
11. bch-c5-13 · scoping review
    Of the 8976 titles identified, 47 were included subsequent to full-text screening. Most studies identified focused on prevalence, and were conducted in Europe, with additional studies from Asia, and North America. ... no studies addressed labeling or educational needs for these allergens.
    J Allergy Clin Immunol Pract, 2021 · checked 2026-09-23
12. bch-c5-04 · meta-analysis of RCTs
    These studies involved 182 participants, focusing on healthy or normoglycemic adults, and assessed the effects of chickpeas compared to various foods such as wheat, potatoes, pasta, sauce, cheese, rice, and corn. A meta-analysis involving a subset of studies demonstrated that chickpeas were more effective in reducing blood glucose iAUC compared to potatoes and wheat.
    Nutrients, 2023 · checked 2026-09-23
13. bch-c5-14 · systematic review of intervention trials
    Most of the articles in this review reported that non-oil-seed pulses cause lower glucose (28 of 40 studies) and insulin (16 of 24 studies) responses than other starchy foods in the control groups (mainly wheat-flour-based products or white rice). ... only 1 of 6 studies found a significantly greater increase in satiety compared with the control, and 3 of 6 studies found a significantly greater increase in fullness.
    Nutr Rev, 2026 · checked 2026-09-23
14. bch-c5-17 · claims register
    POL-HC-7622 Name of Food product: Lentil & Bean Shoots Description of food in terms of food legislation categories: food not covered by specific food legislation Was food on Irish market before 1st July 2007: Yes Exact wording of claim as it appears on product: Lentil & Bean Shoots naturally boost your digestive system. Is claim a picture: No. Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7622, snapshot 2026-09-21 · checked 2026-09-23
15. bch-c5-09 · randomised crossover trial
    A total of 108 participants were randomised to receive pulse-based foods (two servings daily of beans, chickpeas, peas or lentils; about 150 g/d dry weight) or their regular diet for 2 months, followed by a washout of 1 month and a cross-over to the other diet for 2 months. ... the pulse-based diet decreased total cholesterol by 8·3 % ... and LDL-C by 7·9 %
    Br J Nutr, 2012 · checked 2026-09-23
16. bch-c5-10 · randomised controlled trial
    A total of 121 participants with type 2 DM were randomized to either a low-GI legume diet that encouraged participants to increase legume intake by at least 1 cup per day, or to increase insoluble fiber by consumption of whole wheat products, for 3 months. ... The low-GI legume diet reduced HbA1c values by -0.5% (95% CI, -0.6% to -0.4%) and the high wheat fiber diet reduced HbA1c values by -0.3% (95% CI, -0.4% to -0.2%).
    Arch Intern Med, 2012 · checked 2026-09-23
17. bch-c5-01 · meta-analysis of RCTs
    Thirty-eight trials (52 trial comparisons, n=2095) with a median of 6 weeks and dose of 130 g/d (0.5-0.67 cup/d) showed that whole dietary pulses decreased low-density lipoprotein-cholesterol (mean difference, -0.14 mmol/L [95% CI, -0.19 to -0.08]) ... Analyses by pulse type showed similar results. A linear inverse relationship was shown for beans up to 1 cup/d for low-density lipoprotein-cholesterol (coefficient, -0.25 mmol/L/0.5 cup [95% CI, -0.48 to -0.02]) ... Future studies on chickpeas, dried peas, and lentils are warranted.
    J Am Heart Assoc, 2026 · checked 2026-09-23
18. bch-c5-11 · prospective cohort
    Hazard ratios (HRs) [95% confidence interval (CI)] of CVD mortality were 1.52 (1.02-2.89) (P-trend = 0.034) and 2.23 (1.32-3.78) (P-trend = 0.002) for the 3rd tertile of total legumes and dry beans consumption, respectively, compared with the 1st tertile. When comparing extreme tertiles, higher total legumes and lentils consumption was associated with 49% (HR: 0.51; 95% CI: 0.31-0.84; P-trend = 0.009) and 37% (HR: 0.63; 95% CI: 0.40-0.98; P-trend = 0.049) lower risk of cancer mortality.
    Clin Nutr, 2019 · checked 2026-09-23