Know2eat

Chestnuts

Castanea crenata

What chestnuts has been studied for

2 associations assessed — none with dependable human evidence behind them yet. Strongest first.

  • 2 Insufficient
4 things to know first — allergies, interactions and intake limits

About chestnuts

The one common nut that is mostly starch and water rather than fat, which is why chestnuts were historically milled into flour as a bread substitute in mountain Europe. The USDA reference entry is for raw Japanese chestnuts, which are lower in fat and higher in water than European ones.

Also known as Sweet chestnut, Japanese chestnut, Marron

Blood Sugar & Metabolic HealthGut & Digestive Health

The evidence in depth

Best supported: Insufficient

What each association actually rests on, and the papers behind it. A rating describes the state of the research, not how impressive the food is. How we rate evidence.

Blood glucose response

Blood Sugar & Metabolic Health
Insufficient evidence

There is not enough human research to say how chestnuts affect blood glucose. They are a starchy food rather than a fatty nut, so the trial evidence gathered on nuts generally does not transfer to them.

Insufficient evidence. Not enough human research to say anything useful yet.

2 sources

Deep research mode adds each paper’s own conclusion and stated limitations.

Digestive comfort

Gut & Digestive Health
Insufficient evidence

Chestnut flour is used as a gluten-free ingredient and is sometimes promoted for digestive tolerance. There is no meaningful body of human research behind that, beyond the fact that it contains no gluten.

Insufficient evidence. Not enough human research to say anything useful yet.

1 source

Deep research mode adds each paper’s own conclusion and stated limitations.

Ask about Chestnuts

Ask about Chestnuts

Answers are written only from the entries on this page — the same nutrients, compounds, claims and citations you can read above. Nothing is added from outside the database, and every answer lists what it was built from.

AI explanations are not switched on for this site, so there is nothing to ask here. Everything above is read straight from the database and does not need them.

Key nutrients

Nutrient content per 100 grams
NutrientAmount% DV
Macronutrients
Calories154 kcal8%
Protein2.25 g5%
Total fat0.53 g1%
Carbohydrate34.9 g13%
Water61.4 g—
Fats
Saturated fat0.078 g0%
Monounsaturated fat0.278 g—
Polyunsaturated fat0.138 g—
Cholesterol0 mg0%
Linoleic acid (omega-6)0.123 g—
Vitamins
Vitamin A2 µg0%
Vitamin C26.3 mg29%
Vitamin D0 µg0%
Thiamin (B1)0.344 mg29%
Riboflavin (B2)0.163 mg13%
Niacin (B3)1.5 mg9%
Pantothenic acid (B5)0.206 mg4%
Vitamin B60.283 mg17%
Folate47 µg12%
Vitamin B120 µg0%
Minerals
Calcium31 mg2%
Iron1.45 mg8%
Magnesium49 mg12%
Phosphorus72 mg6%
Potassium329 mg7%
Sodium14 mg1%
Zinc1.1 mg10%
Copper0.562 mg62%
Manganese1.59 mg69%
Other measured compounds
Ash0.91 g—

Nutrient values are per 100 g of the USDA reference entry named on this page and vary with variety, growing conditions, storage and preparation.

Source record: Nuts, chestnuts, japanese, raw (USDA FoodData Central, FDC ID 169413).

% DV uses the FDA Daily Values for adults and children aged 4 and over. A dash means no Daily Value has been established for that nutrient.

Bioactive compounds

Compounds present in meaningful amounts. Presence is banded rather than quantified, because whole-food levels vary enormously with variety, growing conditions, storage and preparation.

How preparation changes things

Only effects with real support are listed. If a preparation method is missing, it is because nothing dependable is documented — not because it makes no difference.

  • roastedIncreases starch digestibility and sweetness

    Roasting gelatinises the starch and converts some of it to sugars, which is what makes roasted chestnuts sweet and also makes their starch more rapidly digested than in the raw nut.

  • boiledReduces tannins

    Boiling and peeling off the inner pellicle removes much of the bitter tannin fraction.

Things to know

Allergies, interactions and intake concerns. Every food gets this section — a reference where everything is uniformly good is not a reference.

  • Allergy

    Chestnut allergy and latex-fruit syndrome

    Chestnut is a recognised tree nut allergen and is one of the foods most strongly involved in latex-fruit syndrome, where people allergic to natural rubber latex react to chestnut, banana, avocado and kiwi. Reactions can be severe.

  • Worth knowing

    Do not confuse with horse chestnuts

    Horse chestnuts, the conkers of Aesculus hippocastanum, look superficially similar and are poisonous, causing vomiting, abdominal pain and in quantity more serious effects. Poisonings occur most often in children. Edible chestnuts have a pointed tip and a tassel; conkers are round and smooth.

  • Worth knowing

    Roasting whole chestnuts without scoring them

    Water trapped inside the shell turns to steam and the nut bursts violently. Cutting a cross through the shell before roasting is a safety step, not a tradition.

  • Worth knowing

    Nutritionally unlike other nuts

    Chestnuts contain very little fat and protein and a great deal of starch. Substituting them for almonds or walnuts in a diet designed around nut fat gives a quite different result.