Chickpeas, Cholesterol and Blood Pressure

The heart case for chickpeas rests on three chickpea trials and a stack of pulse meta-analyses, and it is worth being precise about what each shows. When adults added roughly half a cup of chickpeas a day to their diet for five to twelve weeks, their LDL cholesterol fell by about 4–5% — small, consistent, and statistically real. Pooling every randomised trial of pulses, a daily serving lowers LDL by 0.17 mmol/L (about 6.6 mg/dL) and systolic blood pressure by about 2 mmHg. Over decades, people who eat legumes four or more times a week have roughly a fifth less coronary heart disease than those who rarely do. None of these numbers rivals a statin, and nobody should expect them to. What they describe is a cheap, everyday food that nudges two of the biggest risk factors in the right direction at once, largely by replacing the foods that push them the wrong way. This article lays out the mechanism, each trial with its size and result, the blood-pressure evidence, the long-term cohorts, and an honest sense of scale.

Table of Contents

  1. Two Numbers That Drive Heart Risk
  2. How a Chickpea Lowers LDL
  3. The Chickpea Trials
  4. The Pulse Meta-Analyses
  5. Blood Pressure
  6. Long-Term Outcomes: The Cohorts
  7. How Big the Effect Really Is
  8. How Much, How Often, in What Form
  9. Salt, Cans and Rinsing
  10. Who Benefits Most, and Who Should Be Careful
  11. Key Research Papers
  12. Connections
  13. Featured Videos

Two Numbers That Drive Heart Risk

Most of what a food can do for the heart runs through two measurements: LDL cholesterol, the particle that carries cholesterol into artery walls and builds plaque, and blood pressure, the force that damages those walls and the heart muscle behind them. Lower either for long enough and heart attacks and strokes become less frequent; that relationship has been confirmed in hundreds of drug trials and is the yardstick any dietary claim has to be measured against.

Chickpeas act on both, through different parts of the bean. The soluble fibre handles most of the cholesterol work. The potassium (291 mg per 100 g cooked, 477 mg per cup, by USDA figures), magnesium (48 mg per 100 g) and near-absence of sodium (7 mg per 100 g when cooked without salt) handle the blood-pressure side, along with whatever saltier, higher-glycaemic food the chickpeas displace. The sections below take each in turn.

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How a Chickpea Lowers LDL

The liver makes bile acids from cholesterol and pours them into the gut to help digest fat. Normally about 95% of those bile acids are reabsorbed at the end of the small intestine and recycled. Viscous soluble fibre — the gel-forming kind that chickpeas carry — traps bile acids in that gel so they leave the body in the stool instead. The liver must then make fresh bile acids, and it does so by pulling LDL cholesterol out of the blood. Every gram of soluble fibre that reaches the gut costs the body a little cholesterol this way.

A second route runs through the colon. The fibre and resistant starch that bacteria ferment there produce short-chain fatty acids, and one of them, propionate, is absorbed and appears to dampen the liver's own cholesterol synthesis. A 2002 review by Anderson and Major, which remains the standard account of pulses and blood lipids, put the two mechanisms together and estimated from the trials then available that regular pulse intake lowers LDL by roughly 5–8%, with soluble fibre doing most of the work and the plant protein and displacement of saturated fat contributing.

The third route is displacement, and the Tasmanian chickpea trials measured it directly: when people ate chickpeas, they ate less of other things, their polyunsaturated-to-saturated fat ratio improved, and their fibre went up by nearly 7 g a day. Statistical adjustment for those changes shrank but did not erase the cholesterol effect — meaning the chickpea's own fibre does part of the work and what it crowds off the plate does the rest.

Chickpeas also contain a modest amount of plant sterols and about 2.6 g of fat per 100 g, most of it polyunsaturated (1.16 g) and monounsaturated (0.58 g). Neither is present in large enough quantity to matter much on its own; the fibre is the active ingredient.

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The Chickpea Trials

Almost everything known about chickpeas specifically and cholesterol comes from one research group at the University of Tasmania, working with the Baker Heart Research Institute, between 2004 and 2008. Three trials, each in free-living adults eating otherwise normal diets.

Pittaway 2006 (randomised crossover, 47 adults, two periods of at least 5 weeks each). A chickpea-supplemented diet was compared with a wheat-supplemented diet matched for weight maintenance. After the chickpea period, total cholesterol was 3.9% lower and LDL 4.6% lower than after the wheat period (both P < 0.01). Multivariate analysis suggested the differences were mainly due to small differences in polyunsaturated fat and dietary fibre between the two diets.

Pittaway 2007 (randomised crossover, controlled diet, 5 weeks each period). Same design, tighter dietary control. Total cholesterol fell by 0.25 mmol/L (about 9.7 mg/dL, P < 0.01) and LDL by 0.20 mmol/L (about 7.7 mg/dL, P = 0.02) on chickpeas compared with wheat. An unintended rise in polyunsaturated fat intake during the chickpea phase was adjusted for; the adjustment reduced but did not eliminate the effect. Glucose tolerance did not change. Participants reported better bowel function and, some of them, greater satiety.

Pittaway 2008 (exploratory single-arm, 45 adults, 12 weeks then 4 weeks washout). Participants added at least 728 g of drained canned chickpeas a week — four 300 g cans — to whatever they normally ate, with no other instruction. After 12 weeks, total cholesterol was 7.7 mg/dL (0.20 mmol/L) lower and LDL 7.3 mg/dL (0.19 mmol/L) lower (P ≤ 0.01); fasting insulin and HOMA-IR also fell slightly. Fibre intake rose by 6.77 g a day.

Three trials, three designs, one answer: about half a cup of chickpeas a day, for five weeks or more, lowers LDL by roughly 0.2 mmol/L, or 4–5%. The trials are small and short, and they share one team — independent replication would be welcome — but the pulse-wide evidence below points the same way.

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The Pulse Meta-Analyses

Bazzano and colleagues, 2011 (10 randomised trials, 268 participants, at least 3 weeks each). Restricted to non-soy legumes — beans, lentils, chickpeas, peas — against control diets. Pooled net change: total cholesterol −11.8 mg/dL (95% CI −16.1 to −7.5) and LDL −8.0 mg/dL (95% CI −11.4 to −4.6).

Ha and colleagues, 2014 (26 randomised trials, 1,037 participants). The larger and more recent pooling. Diets emphasising pulses at a median dose of 130 g a day — about one serving — lowered LDL by 0.17 mmol/L (95% CI −0.25 to −0.09), or about 6.6 mg/dL, compared with control diets. Two null findings deserve equal billing: there was no significant effect on apolipoprotein B or non-HDL cholesterol, the two measures many cardiologists now consider better predictors of risk than LDL alone. The authors called for longer and higher-quality trials.

Ferreira and colleagues, 2021 (systematic review of 20 human intervention studies). Most of the eligible trials reported improvements in blood lipids, blood pressure or inflammatory markers with whole-pulse intake, but the review found no consistent dose at which benefits appear — a fair reflection of how varied the trials are.

The two meta-analyses agree closely with each other and with the chickpea trials: a serving of pulses a day lowers LDL by somewhere between 6 and 8 mg/dL. That is the number to remember.

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Blood Pressure

Jayalath and colleagues, 2014 (meta-analysis of 8 isocaloric controlled feeding trials, 554 participants with and without hypertension). When pulses were swapped calorie-for-calorie for other foods, systolic blood pressure fell by 2.25 mmHg (95% CI −4.22 to −0.28, P = 0.03) and mean arterial pressure by 0.75 mmHg. Diastolic pressure fell by 0.71 mmHg, which was not statistically significant. Heterogeneity between trials was significant for every outcome, so the pooled figure is an average of quite different results.

Jenkins and colleagues, 2012 (randomised controlled trial, 121 adults with type 2 diabetes, 3 months). A low-GI diet built around at least a cup of legumes a day was compared with a high-wheat-fibre diet. Beyond the HbA1c result covered in the blood-sugar article, the legume diet lowered systolic blood pressure by 4.5 mmHg more than the wheat-fibre diet (95% CI −7.0 to −2.1, P < 0.001), and that blood-pressure change was the main driver of the calculated 0.8% reduction in ten-year coronary risk.

Papanikolaou and Fulgoni, 2008 (NHANES 1999–2002, cross-sectional). Among US adults, baked-bean consumers had lower systolic blood pressure than non-consumers, and bean consumers in general had higher potassium and magnesium intakes — the two minerals most consistently linked to lower blood pressure.

The mechanism is unglamorous: potassium and magnesium relax blood-vessel walls and help the kidneys excrete sodium; fibre and slower carbohydrate absorption lower insulin, which otherwise prompts sodium retention; and a plate with chickpeas on it tends to have less processed, salted food on it. Two to four mmHg is the size of effect a modest reduction in salt intake produces, and it is worth having.

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Long-Term Outcomes: The Cohorts

Trials measure cholesterol and blood pressure over weeks. Cohort studies follow people for decades and count heart attacks. They cannot prove cause, but they are the only evidence that the risk-factor changes actually add up to fewer events.

NHANES I Follow-up (Bazzano and colleagues, 2001; 9,632 US adults, average 19 years). People eating legumes four or more times a week had a 22% lower risk of coronary heart disease (relative risk 0.78, 95% CI 0.68–0.90) and an 11% lower risk of cardiovascular disease overall than those eating them less than once a week, after adjustment for the established risk factors.

Afshin and colleagues, 2014 (meta-analysis of 25 observational studies, over 500,000 people). Legume consumption was inversely associated with ischaemic heart disease: relative risk 0.86 per four 100 g servings a week (95% CI 0.78–0.94), with no heterogeneity between the five studies. Legumes were not significantly associated with stroke (six studies) or diabetes (two studies).

Marventano and colleagues, 2017 (meta-analysis of 14 studies, 11 cohorts, 367,000 people). The highest category of legume intake carried a 10% lower risk of both cardiovascular disease and coronary heart disease (relative risk 0.90, 95% CI 0.84–0.97), with little heterogeneity and no publication bias. Again, no association with stroke.

Viguiliouk and colleagues, 2019 (umbrella review and updated meta-analysis of 28 prospective cohorts). Prepared to update the European Association for the Study of Diabetes nutrition guidelines, this review confirmed the inverse associations between pulse intake and cardiovascular disease incidence and coronary heart disease, graded the certainty of the evidence as low to moderate, and noted the same absence of a stroke signal.

Three independent poolings converge on legume-eaters having roughly 10–20% less coronary heart disease, and none finds an effect on stroke. Both halves of that sentence belong on the page.

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How Big the Effect Really Is

An LDL reduction of 0.17–0.20 mmol/L (6.6–7.7 mg/dL) is about a twentieth of the reduction a standard statin dose produces, and roughly what a person might get from swapping butter for olive oil or adding a daily bowl of oats. On a typical LDL of 3.5 mmol/L (135 mg/dL) it is a 5% change — visible on a blood test, not transformative.

That said, three things make it worth more than it looks. First, it is additive: the chickpea effect sits on top of whatever else a person does, including medication. Second, it comes with a blood-pressure reduction, a blood-sugar reduction and a large dose of fibre in the same food, and the cohort data suggest those combine into a meaningful drop in heart disease over years. Third, it costs almost nothing and has no side effects beyond the gas discussed in the safety article.

The right mental model is not "chickpeas lower cholesterol" as a treatment, but "a diet with pulses in it most days is measurably kinder to the heart than one without", with chickpeas as one of the cheapest and most versatile ways to get there. The wider context is on the cholesterol management and hypertension pages.

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How Much, How Often, in What Form

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Salt, Cans and Rinsing

Chickpeas boiled without salt contain 7 mg of sodium per 100 g by USDA figures — effectively none. Canned chickpeas are a different matter: salt is added to the canning liquid, and a serving from a typical can carries several hundred milligrams. For a food eaten partly for its blood-pressure benefit, that matters.

A 2011 study in the Journal of Culinary Science & Technology measured the sodium in canned beans after draining, and after draining and rinsing, and found that both steps reduce it, with draining and rinsing together removing the most. A 1983 study on canned green beans reached a related conclusion: rinsing did little, but discarding the canning brine and heating the beans in fresh water cut salt by a third. The practical rule is the same either way: pour off the liquid, rinse under running water for a minute, and if you are heating them, use fresh water.

Two further options: buy cans labelled "no salt added", or cook dried chickpeas yourself and salt them to taste at the table — the cheapest route, and the one that gives full control. Dried chickpeas also keep for a year or more. If you cook a batch, freeze it in portions with a little of its cooking liquid, which is where some of the minerals have leached.

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Who Benefits Most, and Who Should Be Careful

People with mildly raised LDL cholesterol who would rather try diet before medication, or who want to lower the dose they need, are the population the trials were run in. A 5% LDL reduction from chickpeas, added to the effects of oats, nuts, olive oil and less saturated fat, is the logic behind "portfolio" dietary approaches that in combination can rival a low-dose statin.

People with high blood pressure gain from the potassium, the magnesium and the displacement of salty processed food, provided the chickpeas are not bringing a can's worth of sodium with them.

People already on statins can eat chickpeas freely; there is no interaction, and the dietary effect adds to the drug's.

People on potassium-sparing diuretics, ACE inhibitors, or with reduced kidney function are sometimes asked to watch potassium. A cup of chickpeas (477 mg) is comparable to a banana; it is not a reason to avoid them, but it is a figure to count if a limit has been set.

People taking warfarin will be glad to know chickpeas are low in vitamin K (4 µg per 100 g), so they do not disturb the dose the way green leafy vegetables can.

What the evidence does not support: chickpea extracts, chickpea-derived supplements, or eating chickpeas as a substitute for prescribed treatment in someone with established heart disease or very high cholesterol. The evidence is for the food, in ordinary amounts, as part of a pattern.

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Key Research Papers

Author names, titles and journals are plain text; only the PMID or DOI is a link. Every identifier below was checked against PubMed or Crossref before publication.

  1. Anderson JW, Major AW (2002). Pulses and lipaemia, short- and long-term effect: potential in the prevention of cardiovascular disease. The British Journal of Nutrition. — PubMed PMID: 12498626
  2. Pittaway JK, Ahuja KD, Cehun M, Chronopoulos A, et al (2006). Dietary supplementation with chickpeas for at least 5 weeks results in small but significant reductions in serum total and low-density lipoprotein cholesterols in adult women and men. Annals of Nutrition & Metabolism. — PubMed PMID: 17191025
  3. Pittaway JK, Ahuja KD, Robertson IK, Ball MJ (2007). Effects of a controlled diet supplemented with chickpeas on serum lipids, glucose tolerance, satiety and bowel function. Journal of the American College of Nutrition. — PubMed PMID: 17906185
  4. Pittaway JK, Robertson IK, Ball MJ (2008). Chickpeas may influence fatty acid and fiber intake in an ad libitum diet, leading to small improvements in serum lipid profile and glycemic control. Journal of the American Dietetic Association. — PubMed PMID: 18502235
  5. Bazzano LA, Thompson AM, Tees MT, Nguyen CH, Winham DM (2011). Non-soy legume consumption lowers cholesterol levels: a meta-analysis of randomized controlled trials. Nutrition, Metabolism, and Cardiovascular Diseases. — PubMed PMID: 19939654
  6. Ha V, Sievenpiper JL, de Souza RJ, Jayalath VH, et al (2014). Effect of dietary pulse intake on established therapeutic lipid targets for cardiovascular risk reduction: a systematic review and meta-analysis of randomized controlled trials. CMAJ. — PubMed PMID: 24710915 (no significant effect on apolipoprotein B or non-HDL cholesterol)
  7. Ferreira H, Vasconcelos M, Gil AM, Pinto E (2021). Benefits of pulse consumption on metabolism and health: A systematic review of randomized controlled trials. Critical Reviews in Food Science and Nutrition. — PubMed PMID: 31983216
  8. Jayalath VH, de Souza RJ, Sievenpiper JL, Ha V, et al (2014). Effect of dietary pulses on blood pressure: a systematic review and meta-analysis of controlled feeding trials. American Journal of Hypertension. — PubMed PMID: 24014659
  9. Jenkins DJ, Kendall CW, Augustin LS, Mitchell S, et al (2012). Effect of legumes as part of a low glycemic index diet on glycemic control and cardiovascular risk factors in type 2 diabetes mellitus: a randomized controlled trial. Archives of Internal Medicine. — PubMed PMID: 23089999
  10. Papanikolaou Y, Fulgoni VL 3rd (2008). Bean consumption is associated with greater nutrient intake, reduced systolic blood pressure, lower body weight, and a smaller waist circumference in adults: results from the National Health and Nutrition Examination Survey 1999-2002. Journal of the American College of Nutrition. — PubMed PMID: 18845707
  11. Bazzano LA, He J, Ogden LG, Loria C, et al (2001). Legume consumption and risk of coronary heart disease in US men and women: NHANES I Epidemiologic Follow-up Study. Archives of Internal Medicine. — PubMed PMID: 11718588
  12. Afshin A, Micha R, Khatibzadeh S, Mozaffarian D (2014). Consumption of nuts and legumes and risk of incident ischemic heart disease, stroke, and diabetes: a systematic review and meta-analysis. The American Journal of Clinical Nutrition. — PubMed PMID: 24898241
  13. Marventano S, Izquierdo Pulido M, Sánchez-González C, Godos J, et al (2017). Legume consumption and CVD risk: a systematic review and meta-analysis. Public Health Nutrition. — PubMed PMID: 28077199
  14. Viguiliouk E, Glenn AJ, Nishi SK, Chiavaroli L, et al (2019). Associations between Dietary Pulses Alone or with Other Legumes and Cardiometabolic Disease Outcomes: An Umbrella Review and Updated Systematic Review and Meta-analysis of Prospective Cohort Studies. Advances in Nutrition. — PubMed PMID: 31728500
  15. Duyff RL, Mount JR, Jones JB (2011). Sodium Reduction in Canned Beans After Draining, Rinsing. Journal of Culinary Science & Technology. — doi:10.1080/15428052.2011.582405
  16. Vermeulen RT, Sedor FA, Kimm SY (1983). Effect of water rinsing on sodium content of selected foods. Journal of the American Dietetic Association. — PubMed PMID: 6833685

PubMed Topic Searches

  1. PubMed: chickpeas and LDL cholesterol in trials
  2. PubMed: dietary pulses and blood pressure
  3. PubMed: legume consumption and coronary heart disease in cohorts

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Connections

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