Pecan (Carya illinoinensis): Benefits, Dosage, Side Effects & Evidence

Q: What is Pecan used for?

Pecan is most often taken for Lowers LDL and total cholesterol in controlled trials (~6% LDL reduction), Reduces non-HDL cholesterol, apolipoprotein B and triglycerides, Improves the total-to-HDL cholesterol ratio and lipoprotein particle profile, Improves fasting insulin and insulin sensitivity (HOMA-IR) in short trials. A buttery tree nut shown in trials to lower LDL cholesterol

Q: Does Pecan work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. Pecans have moderate, lipid-focused evidence. Several short-to-medium randomized controlled trials show that eating roughly 1-2 oz (28-57 g) daily, in place of usual snacks, meaningfully lowers LDL cholesterol (around 6%), total and non-HDL cholesterol, apolipoprotein B and triglycerides, and improves cholesterol ratios and lipoprotein particle counts. A 2018 Nutrients pecan-rich-diet RCT in overweight adults also improved fasting insulin and insulin resistance, and a 2025 Journal of Nutrition snack-substitution RCT confirmed the lipid benefits with better diet quality and no weight gain. These are surrogate markers measured over weeks, not hard cardiovascular endpoints. Pecan-specific trials on heart attacks, diabetes or mortality do not exist; those benefits are extrapolated from the wider tree-nut literature, where large cohorts (Aune 2016 meta-analysis) and the PREDIMED trial link nut intake to lower cardiovascular events and all-cause mortality. As a single nut, pecans sit at moderate evidence: consistent lipid effects, but less data than walnuts or almonds.

Q: How many studies support Pecan?

NutriDex cites 7 sources for Pecan, graded "Moderate".

Peh, Daryl

🌰

Pecan

Carya illinoinensis

A buttery tree nut shown in trials to lower LDL cholesterol

Moderate evidence 🥜Nuts 🫀Heart & Metabolic ⏳Longevity

✚ Updated 7 Jun 2026 · How we grade evidence

Evidence tier

Moderate

Research weight

Citations

7 verified / 7

Classification

Nuts

❝

What the evidence says. Several controlled trials; effects real but modest or context-dependent.

Nutrition per serving 1 oz (28 g, ~19 pecan halves)

Sugars 1.1 g4%
Fibre 2.7 g10%
Other carbs 0.1 g0%
Protein 2.6 g9%
Fat 20.1 g72%
Other 1.4 g5%

What's in one serving, by weight — average composition (USDA).

One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.

193 kcal2.6 g protein2.7 g fiber20 g fat

Nutrient	Per serving	% daily value
Fiber	2.7 g	10%
Protein	2.6 g	5%
Vitamin E	0.4 mg	3%
Magnesium	34 mg	8%
Copper	0.34 mg	38%
Manganese	1.3 mg	55%
Zinc	1.3 mg	12%
Selenium	1.1 µg	2%
Phosphorus	78 mg	6%
Potassium	115 mg	2%
Iron	0.71 mg	4%
Calcium	20 mg	2%
Folate	6 µg	2%

Composition data: USDA FoodData Central ↗

What is Pecan?

Pecan (Carya illinoinensis) is a nut or seed used for lowers ldl and total cholesterol in controlled trials (~6% ldl reduction). NutriDex grades the human evidence as Moderate. Pecans have moderate, lipid-focused evidence. Several short-to-medium randomized controlled trials show that eating roughly 1-2 oz (28-57 g) daily, in place of usual snacks, meaningfully lowers LDL cholesterol (around 6%), total and non-HDL cholesterol, apolipoprotein B and triglycerides, and improves cholesterol ratios and lipoprotein particle counts. A 2018 Nutrients pecan-rich-diet RCT in overweight adults also improved fasting insulin and insulin resistance, and a 2025 Journal of Nutrition snack-substitution RCT confirmed the lipid benefits with better diet quality and no weight gain. These are surrogate markers measured over weeks, not hard cardiovascular endpoints. Pecan-specific trials on heart attacks, diabetes or mortality do not exist; those benefits are extrapolated from the wider tree-nut literature, where large cohorts (Aune 2016 meta-analysis) and the PREDIMED trial link nut intake to lower cardiovascular events and all-cause mortality. As a single nut, pecans sit at moderate evidence: consistent lipid effects, but less data than walnuts or almonds.

Purported Benefits

✓Lowers LDL and total cholesterol in controlled trials (~6% LDL reduction)

✓Reduces non-HDL cholesterol, apolipoprotein B and triglycerides

✓Improves the total-to-HDL cholesterol ratio and lipoprotein particle profile

✓Improves fasting insulin and insulin sensitivity (HOMA-IR) in short trials

✓Part of the tree-nut group linked to lower CVD and all-cause mortality in cohorts

✓Nutrient-dense source of MUFA, fiber and antioxidants with no weight gain at studied doses

Dosing & Compounds

Typical Dose

About 1-2 oz (28-57 g) per day, a small-to-large handful, replacing other snacks rather than added on top.

Active Compounds

Monounsaturated fat (oleic acid)Polyunsaturated fat (linoleic acid)Dietary fiberPhytosterols (beta-sitosterol)Vitamin E (gamma-tocopherol)MagnesiumPolyphenols and flavonoids (ellagic acid, condensed tannins)L-arginineZinc and copper

Safety & Cautions

Pecans are tree nuts and can trigger IgE-mediated allergy, including life-threatening anaphylaxis; anyone with tree-nut or peanut allergy should avoid them. They are calorie-dense (about 195-200 kcal per 1 oz/28 g), so use them to replace other snacks rather than add to the diet to avoid weight gain. Whole or large pieces are a choking hazard for young children. Buy fresh and store cool/airtight, as their high unsaturated-fat content makes them prone to rancidity. Educational only — always check with your doctor or pharmacist before combining Pecan with any medicine.

Key Studies

meta-analysis Houston 2023 (Am J Clin Nutr) ✓ Full text

Systematic review and meta-analysis of 129 RCTs found tree nut and peanut consumption significantly reduced LDL cholesterol, total cholesterol, triglycerides, and apolipoprotein B, supporting an overall CVD risk reduction.

meta-analysis Tindall 2021 (Diabetes Care / J Nutr) ✓ PubMed

Meta-analysis of 12 RCTs (n=450 with type 2 diabetes) found tree nut supplementation reduced fasting glucose and HbA1c, indicating improved glycemic control.

Meta-analysis Aune et al. dose-response meta-analysis ✓ PubMed

Across 20 prospective cohorts, ~28 g/day of nuts was associated with ~21% lower cardiovascular mortality and ~22% lower all-cause mortality, supporting tree nuts as a group.

RCT Pecan snack-substitution RCT (Guarneiri 2025) ✓ PubMed

Replacing usual snacks with pecans for 12 weeks lowered LDL cholesterol ~6% (7.2 mg/dL), total cholesterol and non-HDL cholesterol, and improved diet quality without weight gain in adults at cardiometabolic risk.

RCT McKay / pecan-rich diet RCT ✓ PubMed

A 4-week pecan-rich diet in overweight/obese adults improved fasting insulin, insulin resistance (HOMA-IR) and beta-cell function versus an isocaloric control diet.

RCT PREDIMED primary-prevention trial (Estruch 2018) ✓ PubMed

A Mediterranean diet supplemented with mixed nuts reduced major cardiovascular events versus a control diet in high-risk adults, though pecans were not the test nut.

RCT McKay 2018 (Nutrients) ✓ Full text

A randomized crossover trial (n=26 overweight/obese adults, 4-wk pecan-enriched diet) reduced serum insulin (-1.31 vs +0.69 uIU/mL, p=0.024) and improved HOMA-IR and beta-cell function, with borderline LDL/total cholesterol reductions.

NutriDex

Pecan

Nutrition per serving 1 oz (28 g, ~19 pecan halves)

What is Pecan?

Purported Benefits

Dosing & Compounds

Safety & Cautions

Key Studies

Common questions about Pecan

What is Pecan used for?

Does Pecan work — what does the evidence say?

What is the typical dose of Pecan?

Is Pecan safe? Any cautions or side effects?

How many studies support Pecan?