NutriDex

The Supplement Research Compendium
🌰

Chestnut

Castanea sativa

Low-fat, starchy tree nut; cardiometabolic data mostly extrapolated

Preliminary evidence 🥜Nuts🫀Heart & Metabolic🛡️Gut & Immune

✚ Updated · How we grade evidence

Evidence tier
Preliminary
Research weight
Citations
9 verified / 9
Classification
Nuts
❝
What the evidence says. Early or small human trials; promising but not yet conclusive.

Nutrition per serving 1 oz (28 g, ~2 roasted chestnuts)

28gSERVING
  • Fibre 2.3 g8%
  • Other carbs 10.5 g38%
  • Protein 0.7 g3%
  • Fat 0.6 g2%
  • Other 13.9 g50%
What's in one serving, by weight — average composition (USDA).
Fiber8%Protein1%Vitamin E0%Magnesium2%Copper14%Manganese12%Zinc1%Selenium0%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
60 kcal0.7 g protein2.3 g fiber0.6 g fat
NutrientPer serving% daily value
Fiber2.3 g8%
Protein0.7 g1%
Vitamin E0 mg0%
Magnesium9 mg2%
Copper0.13 mg14%
Manganese0.27 mg12%
Zinc0.15 mg1%
Selenium0 µg0%
Phosphorus26 mg2%
Potassium145 mg3%
Iron0.28 mg2%
Calcium7.6 mg1%
Folate17 µg4%

Composition data: USDA FoodData Central ↗

What is Chestnut?

Chestnut (Castanea sativa) is a nut or seed used for naturally low in fat and energy-dense fat compared with other tree nuts, so easier to fit in a calorie-controlled diet. NutriDex grades the human evidence as Preliminary. Sweet chestnut is an atypical tree nut: it is starchy, low in fat and lower in calories than almonds or walnuts, and unusually rich in vitamin C, potassium, magnesium and fibre. Direct human trials on chestnut and hard cardiometabolic outcomes (LDL, weight, glycaemia, mortality) are essentially absent, so most claims are extrapolated from nuts as a group or from animal and preliminary studies. The broader nut evidence is stronger: a 2023 systematic review and meta-analysis of randomized trials found tree-nut and peanut intake significantly lowered LDL cholesterol, total cholesterol and apolipoprotein B (certainty mostly low-to-moderate). In the PREDIMED randomized trial, a Mediterranean diet supplemented with mixed nuts cut major cardiovascular events versus a control diet, and large prospective cohorts (Bao 2013) link higher nut intake to lower all-cause and cardiovascular mortality. These data centre on walnuts, almonds and mixed nuts, not chestnut specifically; chestnut's own cardiometabolic effect in humans remains unproven.

Purported Benefits

✓Naturally low in fat and energy-dense fat compared with other tree nuts, so easier to fit in a calorie-controlled diet
✓Provides fibre and resistant starch that support satiety and gut health
✓Notably high in vitamin C for a nut (mostly retained when roasted), plus potassium and magnesium relevant to blood pressure
✓Gluten-free starchy alternative to grains for people with coeliac disease
✓Contributes polyphenols (gallic and ellagic acid) with antioxidant activity
✓As part of overall nut/tree-nut intake, may share the modest LDL-cholesterol and cardiovascular benefits seen for nuts as a group

Dosing & Compounds

Typical Dose
About 1 oz (~28 g), roughly 3-4 roasted chestnuts, as part of a varied diet; no chestnut-specific therapeutic dose is established
Active Compounds
Complex carbohydrate / starch (chestnuts are starchy, unlike most nuts)Dietary fibre and resistant starchMonounsaturated fatty acids (MUFA)Vitamin C (ascorbic acid)PotassiumMagnesiumPolyphenols (gallic acid, ellagic acid)Folate and B vitamins

Safety & Cautions

Chestnuts can trigger tree-nut allergy, including potentially life-threatening anaphylaxis; people allergic to tree nuts should avoid them, and there is notable cross-reactivity between chestnut and natural rubber latex (latex-fruit syndrome). Like all nuts they are calorie-dense, though chestnuts are lower in fat and calories than most tree nuts. Whole or large pieces are a choking hazard for young children. Note distinctions across nuts: Brazil nuts are extremely high in selenium (limit to roughly 1-3 per day to avoid selenium toxicity), peanuts are a legume rather than a true tree nut and can carry aflatoxin contamination if poorly stored, and raw horse chestnuts (Aesculus, a different plant) are toxic and must not be confused with edible sweet chestnuts. Educational only — always check with your doctor or pharmacist before combining Chestnut with any medicine.

Key Studies

Meta-analysis Glenn/Sabaté 2023 tree nut & peanut meta-analysis ✓ PubMed
Pooled randomized trials showed tree-nut and peanut consumption significantly lowered LDL cholesterol, total cholesterol, triglycerides, apoB and the TC:HDL and LDL:HDL ratios, supporting an overall CVD risk-reduction signal (certainty of evidence mostly low to moderate).
meta-analysis of RCTs Glenn 2023 ✓ Full text
Systematic review and meta-analysis of RCTs of tree nut and peanut consumption confirmed favorable effects on cardiovascular risk factors (blood lipids, blood pressure) supporting cardioprotection.
meta-analysis of RCTs and cohorts Nishi 2021 ✓ Full text
Systematic review/meta-analysis of RCTs: despite being energy-dense, nut consumption produced small reductions in body weight (-0.22 kg), BMI (-0.16 kg/m2) and waist circumference (-0.51 cm), i.e. nuts are weight-neutral to slightly favorable.
meta-analysis of RCTs Del Gobbo 2015 ✓ PubMed
Meta-analysis of 61 RCTs (n=2,582): one 1-oz/day serving of tree nuts lowered LDL cholesterol by 4.8 mg/dL (95% CI -5.5 to -4.2) and total cholesterol by 4.7 mg/dL (95% CI -5.3 to -4.0), with dose (not nut type) the main determinant.
dose-response meta-analysis (cohorts) Aune 2016 ✓ Full text
Dose-response meta-analysis of prospective cohorts: 28 g/day nut intake was associated with 21% lower CVD risk (RR 0.79), 22% lower all-cause mortality (RR 0.78), and 15% lower total cancer (RR 0.85).
meta-analysis of RCTs Viguiliouk 2014 ✓ Full text
Meta-analysis of 12 RCTs (n=450) in type 2 diabetes: tree nuts at a median 56 g/day significantly lowered HbA1c by 0.07% and fasting glucose by 0.15 mmol/L versus control diets.
RCT Estruch 2018 (PREDIMED republication) ✓ PubMed
In ~7,447 high-risk adults, a Mediterranean diet supplemented with mixed nuts reduced major cardiovascular events (MI, stroke, CV death) versus a control low-fat diet (HR ~0.72), though the benefit reflects mixed nuts within a dietary pattern, not chestnut specifically.
narrative review (mechanistic/preclinical) Marrone 2023 ✓ Full text
Narrative review (Nutrients) of Castanea sativa hydrolyzable tannins (gallic/ellagic acid, ellagitannins) reports antioxidant, lipid-regulating, antimicrobial and cardioprotective (endothelial/vascular) actions, though human clinical evidence remains limited.
Cohort Bao 2013 (Nurses' Health Study + HPFS cohorts) ✓ PubMed
Across ~119,000 adults followed up to 30 years, higher nut intake was associated with lower all-cause mortality and lower death from cardiovascular disease in a dose-dependent manner; observational, so causation is not proven.
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Chestnut

What is Chestnut used for?

Chestnut is most often taken for Naturally low in fat and energy-dense fat compared with other tree nuts, so easier to fit in a calorie-controlled diet, Provides fibre and resistant starch that support satiety and gut health, Notably high in vitamin C for a nut (mostly retained when roasted), plus potassium and magnesium relevant to blood pressure, Gluten-free starchy alternative to grains for people with coeliac disease. Low-fat, starchy tree nut; cardiometabolic data mostly extrapolated

Does Chestnut work — what does the evidence say?

Preliminary evidence. Early or small human trials; promising but not yet conclusive. Sweet chestnut is an atypical tree nut: it is starchy, low in fat and lower in calories than almonds or walnuts, and unusually rich in vitamin C, potassium, magnesium and fibre. Direct human trials on chestnut and hard cardiometabolic outcomes (LDL, weight, glycaemia, mortality) are essentially absent, so most claims are extrapolated from nuts as a group or from animal and preliminary studies. The broader nut evidence is stronger: a 2023 systematic review and meta-analysis of randomized trials found tree-nut and peanut intake significantly lowered LDL cholesterol, total cholesterol and apolipoprotein B (certainty mostly low-to-moderate). In the PREDIMED randomized trial, a Mediterranean diet supplemented with mixed nuts cut major cardiovascular events versus a control diet, and large prospective cohorts (Bao 2013) link higher nut intake to lower all-cause and cardiovascular mortality. These data centre on walnuts, almonds and mixed nuts, not chestnut specifically; chestnut's own cardiometabolic effect in humans remains unproven.

What is the typical dose of Chestnut?

About 1 oz (~28 g), roughly 3-4 roasted chestnuts, as part of a varied diet; no chestnut-specific therapeutic dose is established

Is Chestnut safe? Any cautions or side effects?

Chestnuts can trigger tree-nut allergy, including potentially life-threatening anaphylaxis; people allergic to tree nuts should avoid them, and there is notable cross-reactivity between chestnut and natural rubber latex (latex-fruit syndrome). Like all nuts they are calorie-dense, though chestnuts are lower in fat and calories than most tree nuts. Whole or large pieces are a choking hazard for young children. Note distinctions across nuts: Brazil nuts are extremely high in selenium (limit to roughly 1-3 per day to avoid selenium toxicity), peanuts are a legume rather than a true tree nut and can carry aflatoxin contamination if poorly stored, and raw horse chestnuts (Aesculus, a different plant) are toxic and must not be confused with edible sweet chestnuts.

How many studies support Chestnut?

NutriDex cites 9 sources for Chestnut, graded "Preliminary".

Cite this page
APA

Peh, D. (2026). Chestnut (Castanea sativa): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/chestnut

BibTeX
@misc{nutridex_chestnut,
  author       = {Peh, Daryl},
  title        = {Chestnut (Castanea sativa): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/chestnut},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

← Back to the full dex · All substances