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Water chestnuts are the crisp, white corms of a grass-like water plant, not nuts at all. The Chinese water chestnut, Eleocharis dulcis, belongs to the sedge family and grows in flooded fields, and the part you eat is a rounded underground stem with papery brown skin. Most Americans meet them as canned slices in stir-fries, where they stay crunchy even after cooking. This guide covers water chestnut nutrition from the USDA database for fresh and canned forms, answers the question are water chestnuts nuts, explains the difference between the canned and fresh product, and covers one safety point many cooks never hear about: a parasite linked to raw water plants.
Peptide Labs does not sell water chestnuts or water chestnut products. This article is general nutrition information, not medical advice.
Key Takeaways
- Water chestnuts are corms of Eleocharis dulcis, a sedge, so they are a vegetable, not a nut.
- Water chestnuts are not on the FDA list of tree nuts it considers major food allergens.
- Raw water chestnuts are mostly water and starch, with a little fiber, potassium and copper per serving.
- Canned water chestnuts have about half the calories of fresh per 100 grams in USDA data, and less potassium.
- CDC says an intestinal fluke spreads when people eat its cysts on raw aquatic plants, so fresh corms from ponds or fields in affected regions should be peeled and cooked.
What are water chestnuts?
A 2022 review in the Journal of the Science of Food and Agriculture describes Eleocharis dulcis as an aquatic plant of the Cyperaceae (sedge) family, native to Asia and also found in tropical Africa and Australia. The plant has tall, hollow green stems; the edible corm forms below the mud. Under the dark skin, the flesh is white, juicy and mildly sweet, a little like a cross between an apple and a fresh nut.
One naming trap: the water caltrop (Trapa species) is a different plant whose horned seed is also sold as “water chestnut” in some markets, especially in South Asian groceries. The canned slices in US supermarkets are the Chinese water chestnut. Water chestnuts are also unrelated to real chestnuts, the tree nuts roasted in winter, which are much higher in calories (see the table below).
Are water chestnuts nuts?
No. Botanically they are corms, the swollen base of a stem, in the same broad sense as a taro corm. For food labels, the FDA keeps a list of tree nuts it considers major food allergens. In its January 2025 allergen guidance (Edition 5), that list names almond, black walnut, Brazil nut, California walnut, cashew, hazelnut, heartnut, macadamia, pecan, pine nut, pistachio and walnut. Water chestnut is not on it, and it is not among the nine major food allergens under US law. That does not rule out an individual allergy to any food, so if you react to a dish, talk with an allergist rather than guessing which ingredient caused it.
Nutrition facts for fresh and canned water chestnuts
The table uses USDA FoodData Central SR Legacy entries: raw Chinese water chestnuts (FDC 170066) and canned water chestnuts, solids and liquids (FDC 170067). Percent Daily Values use the FDA reference amounts. USDA gives no sugar figure for either entry.
| Nutrient | Raw, 1/2 cup slices (62 g) | %DV | Canned, 1/2 cup slices (70 g) | %DV |
|---|---|---|---|---|
| Calories | 60 | 35 | ||
| Carbohydrate | 14.8 g | 5% | 8.6 g | 3% |
| Fiber | 1.9 g | 7% | 1.8 g | 6% |
| Protein | 0.9 g | 2% | 0.6 g | 1% |
| Potassium | 362 mg | 8% | 83 mg | 2% |
| Copper | 0.20 mg | 22% | 0.07 mg | 8% |
| Vitamin B6 | 0.20 mg | 12% | 0.11 mg | 7% |
| Manganese | 0.21 mg | 9% | 0.11 mg | 5% |
| Riboflavin | 0.12 mg | 10% | 0.02 mg | 1% |
| Vitamin C | 2.5 mg | 3% | 0.9 mg | 1% |
| Sodium | 9 mg | 6 mg |
A few patterns stand out. Fresh water chestnuts are about three-quarters water, and almost all their calories come from starch. Per USDA, four raw water chestnuts weigh about 36 grams and provide about 35 calories with 4% of the Daily Value for fiber. Copper is the nutrient with the highest %DV in the raw corm. Canned water chestnuts sit in liquid, so per 100 grams they carry more water and roughly half the calories of raw ones, and they keep only about a fifth of the potassium. The USDA canned entry is low in sodium, but brands differ, so check the Nutrition Facts label on the can.
For context, our guide to foods high in potassium lists foods with larger amounts per serving, and our high-fiber foods guide explains where water chestnuts sit among vegetables. If a clinician has asked you to limit potassium, ask them how fresh water chestnuts fit, since raw ones are richer in it than canned.
How they compare with similar crunchy foods
Per 100 grams in USDA SR Legacy data, here is how water chestnuts compare with other crisp or starchy foods people often confuse them with, including lotus root, jicama and true chestnuts.
| Food (USDA SR Legacy, per 100 g) | Calories | Carbohydrate | Fiber | Potassium | Vitamin C |
|---|---|---|---|---|---|
| Water chestnuts, raw (170066) | 97 | 23.9 g | 3.0 g | 584 mg | 4.0 mg |
| Water chestnuts, canned (170067) | 50 | 12.3 g | 2.5 g | 118 mg | 1.3 mg |
| Lotus root, raw (169250) | 74 | 17.2 g | 4.9 g | 556 mg | 44 mg |
| Jicama, raw (170073) | 38 | 8.8 g | 4.9 g | 150 mg | 20.2 mg |
| Bamboo shoots, canned (169212) | 19 | 3.2 g | 1.4 g | 80 mg | 1.1 mg |
| Chestnuts, European, roasted (170190) | 245 | 53.0 g | 5.1 g | 592 mg | 26 mg |
Raw water chestnuts are starchier than jicama or bamboo shoots, so they fit with the foods in our starchy vegetables guide rather than with leafy greens. If you count carbohydrates, our low-carb foods guide shows lower-carb vegetables for comparison. For another water vegetable with more vitamin C, see lotus root.
Raw water plants and an intestinal fluke
The CDC describes Fasciolopsis buski as “the largest intestinal fluke of humans.” Its larvae leave freshwater snails and form cysts on aquatic plants, and people become infected by eating those cysts on the plants. CDC places the infection in Asia and the Indian subcontinent, especially where people raise pigs and eat freshwater plants. Most infections are light and cause no symptoms; CDC lists diarrhea, abdominal pain, fever, fluid buildup and intestinal obstruction in heavier infections.
Peer-reviewed field studies link the fluke to raw water plants, including water chestnuts and water caltrops. In a 1984 survey of 817 schoolchildren in Tainan, Taiwan, all 14 infected children had recently eaten raw water caltrops, compared with 8 of 37 uninfected children examined. A 1989 Chinese field study recommended that aquatic plants such as water chestnut be boiled for 1 to 2 minutes before eating to kill the cysts. On the other hand, a 2006 survey of schoolchildren in a central Thai district with rice and water chestnut fields found no cases, although the fluke had been common there in past decades.
What this means in a US kitchen: the advice here is about fresh corms rather than canned slices. For fresh corms, especially ones grown in or bought from affected regions, wash, peel and cook them rather than eating them raw. Anyone with ongoing abdominal symptoms after travel should see a clinician, who can arrange a stool test; diagnosis and care belong to them.
How to use water chestnuts
This is plain kitchen guidance, not a health claim:
- Canned: drain and rinse, then add sliced or diced water chestnuts near the end of a stir-fry, to lettuce wraps, dumpling fillings or salads for crunch.
- Fresh: pick firm corms with tight skin and no soft spots; wash off the mud, cut away the top and bottom, peel with a paring knife, and keep peeled pieces in cold water until cooking.
- Cooking: they stay crisp when heated. A 2022 texture study found steamed Chinese water chestnuts kept most of their crispness and hardness, losing only a little with longer heating.
- Flour or starch: water chestnut starch is used in some Chinese cakes and as a thickener; read the package to see whether it is pure water chestnut or a blend.
Peeled fresh water chestnuts brown quickly once cut, a known issue in the fresh-cut trade, so prepare them close to cooking time. For another crisp green that grows in water, see our watercress guide, which covers a liver fluke linked to wild watercress.
Frequently Asked Questions
Are water chestnuts nuts?
No. They are corms of a sedge plant. Water chestnut is not on the FDA list of tree nuts considered major food allergens.
Can people with a tree nut allergy eat water chestnuts?
Water chestnuts are not tree nuts under FDA labeling rules, but anyone with a food allergy should check the whole ingredient list and ask an allergist about their own case.
Are canned water chestnuts healthy?
They are low in calories and fat with some fiber, per USDA. They have less potassium than fresh ones, and sodium varies by brand, so check the label.
Can you eat water chestnuts raw?
Many people do, but CDC links an intestinal fluke to cysts on raw aquatic plants in parts of Asia. Wash, peel and cook fresh corms.
Are water chestnuts the same as jicama?
No. Jicama is the root of a legume vine. Both are crisp, but per USDA jicama has fewer calories and carbohydrates per 100 grams.
Why do water chestnuts stay crunchy after cooking?
Research on Chinese water chestnuts shows they keep most of their crisp texture when steamed, unlike most vegetables, which soften.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Lotus Root: USDA Nutrition, How to Cook It and Safety, Jicama: What It Is, Nutrition, Benefits and Seed Safety, Bamboo Shoots: Nutrition, Safety and Canned vs Fresh.