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Do Pistachios Lower Cholesterol and Blood Pressure?

Clinical trials show eating pistachios can modestly lower LDL cholesterol and systolic blood pressure. Here is what the evidence found and how much to eat.

Published October 2026

Short answer

Yes, modestly. Across multiple randomised trials, regular pistachio intake lowered LDL cholesterol and reduced systolic blood pressure by 2 to 3 mmHg without causing weight gain. Evidence grade B (Moderate). Randomised controlled trials and meta-analyses show consistent modest improvements; downgraded one level because cholesterol and blood pressure are surrogate markers rather than hard cardiovascular events.

Key takeaways

  • Meta-analyses of randomised trials show pistachios lower LDL cholesterol by about 4 mg/dL and total cholesterol by around 7 to 8 mg/dL [1][2].
  • Pistachio consumption significantly reduces systolic blood pressure by approximately 2 to 3 mmHg, the strongest blood pressure reduction seen among tree nuts [3][4].
  • Controlled feeding trials show that daily servings of 1 to 2 ounces (about 30 to 60 grams) improve cholesterol ratios without causing weight gain [5][4].
  • Commercial salted and roasted varieties can contain substantial sodium; unsalted or raw nuts are preferable for blood pressure management [6].
  • People with tree nut allergies—especially cashew allergies due to close cross-reactivity—must strictly avoid pistachios [7][8].

The short version

Adding Pistachios to your diet can modestly improve both cholesterol and blood pressure [1][4]. Pooled analyses of randomised controlled trials show that eating 1 to 2 ounces daily lowers LDL cholesterol by about 4 mg/dL and systolic blood pressure by 2 to 3 mmHg [1][3]. These improvements occur without unwanted weight gain, provided the nuts replace other dietary fats or snacks rather than adding extra calories [9][4].

What the studies show

Multiple systematic reviews and meta-analyses have pooled data from randomised feeding trials evaluating pistachios against control diets [1][10].

On blood lipids, a 2023 meta-analysis of 12 randomised trials found that pistachio consumption lowered total cholesterol by an average of 7.48 mg/dL, LDL cholesterol by 3.82 mg/dL, and triglycerides by 11.19 mg/dL [1]. HDL cholesterol did not change significantly across these pooled trials [1]. In a separate network meta-analysis comparing five different tree nuts across 34 clinical trials, pistachio-enriched diets achieved the top ranking for reducing triglycerides, total cholesterol, and LDL cholesterol [11]. A broader meta-analysis of 61 controlled trials confirmed that tree nut consumption reliably lowers LDL cholesterol in a dose-dependent manner, averaging a 4.8 mg/dL reduction per daily ounce [2].

For blood pressure, pistachios appear particularly effective compared to other nuts [3]. A 2015 meta-analysis of 21 trials found that while nuts overall had variable effects on resting hemodynamics, pistachios uniquely produced significant reductions in both systolic blood pressure (−1.82 mmHg) and diastolic blood pressure (−0.80 mmHg) [3]. A 2021 meta-analysis focused specifically on pistachios across 13 trials identified a 2.12 mmHg reduction in systolic blood pressure [4]. A 2022 meta-analysis encompassing 17 trials in 940 adults documented a 2.89 mmHg decrease in systolic blood pressure alongside improvements in fasting glucose and triglycerides [10].

In tightly controlled crossover feeding studies where all meals were provided, 1 to 2 daily servings of pistachios significantly lowered atherogenic small LDL particle counts and reduced peripheral vascular resistance [5][6][12].

The nuances

Several practical considerations determine how much benefit pistachios offer in daily life [5][6].

Preparation matters considerably: raw or dry-roasted unsalted pistachios were used in almost all clinical trials [5][6]. Many commercial roasted pistachios are heavily salted, adding 120 to 250 mg of sodium per ounce, which can directly counteract benefits for blood pressure [6].

Calorie balance is another factor, as whole nuts are energy-dense foods providing roughly 160 calories per ounce [9]. Human metabolic trials demonstrate that about 5% of the energy in pistachios passes through the digestive tract unabsorbed due to rigid plant cell walls, and participants naturally compensate by eating less later in the day [9][4]. Even so, benefits were demonstrated when pistachios replaced other calorie sources—such as refined carbohydrates, butter, or cheese—rather than being added on top of a surplus diet [13][5].

Safety requires special attention for individuals with tree nut allergies [8]. Pistachios contain potent seed storage proteins capable of inducing severe IgE-mediated anaphylaxis [8]. Because pistachios belong to the Anacardiaceae family alongside cashews, there is extensive immunological and clinical cross-reactivity between the two nuts, meaning individuals allergic to cashews must strictly avoid pistachios [7].

What this means for you

For individuals looking to support cardiovascular health through diet, replacing less healthy snacks with unsalted pistachios offers a well-evidenced dietary tweak [1][4].

An effective serving in clinical trials is approximately 1 to 2 ounces per day, equivalent to one to two handfuls or roughly 49 to 98 in-shell nuts [5][9]. Buying in-shell nuts can slow down eating speed and assist with portion control [9].

Pistachios are not a substitute for prescribed blood pressure or cholesterol-lowering medications, as their numerical reductions—around 4 mg/dL for LDL and 2 to 3 mmHg for systolic blood pressure—are modest [1][4]. Anyone with hypertension or hypercholesterolemia should discuss dietary changes with their physician [4].

Go deeper

  • Pistachios — Eating pistachios modestly lowers LDL cholesterol and systolic blood pressure in randomised human trials.

References

  1. Consumption of pistachio nuts positively affects lipid profiles: A systematic review and meta-analysis of randomized controlled trials.. Crit Rev Food Sci Nutr, 2023.
  2. Effects of tree nuts on blood lipids, apolipoproteins, and blood pressure: systematic review, meta-analysis, and dose-response of 61 controlled intervention trials.. Am J Clin Nutr, 2015.
  3. The effect of tree nut, peanut, and soy nut consumption on blood pressure: a systematic review and meta-analysis of randomized controlled clinical trials.. Am J Clin Nutr, 2015.
  4. Effects of pistachios on anthropometric indices, inflammatory markers, endothelial function and blood pressure in adults: a systematic review and meta-analysis of randomised controlled trials.. Br J Nutr, 2021.
  5. Effects of pistachios on cardiovascular disease risk factors and potential mechanisms of action: a dose-response study.. Am J Clin Nutr, 2008.
  6. Diets containing pistachios reduce systolic blood pressure and peripheral vascular responses to stress in adults with dyslipidemia.. Hypertension, 2012.
  7. Association of Clinical Reactivity with Sensitization to Allergen Components in Multifood-Allergic Children.. J Allergy Clin Immunol Pract, 2017.
  8. Allergy to Anacardiaceae: description of cashew and pistachio nut allergens.. J Investig Allergol Clin Immunol, 2000.
  9. Measured energy value of pistachios in the human diet.. Br J Nutr, 2012.
  10. The effect of pistachio supplementation on metabolic syndrome and its components in adults: a systematic review and meta-analysis of randomized controlled trials.. Nutr Rev, 2022.
  11. Comparative effects of different types of tree nut consumption on blood lipids: a network meta-analysis of clinical trials.. Am J Clin Nutr, 2020.
  12. Effect of pistachio consumption on plasma lipoprotein subclasses in pre-diabetic subjects.. Nutr Metab Cardiovasc Dis, 2015.
  13. Effect of pistachio nuts on serum lipid levels in patients with moderate hypercholesterolemia.. J Am Coll Nutr, 1999.