Water Chestnuts

Water Chestnuts: Nutrition Facts and Health Benefits

Water chestnuts (Eleocharis dulcis) are not nuts at all but rather the corms (underground stem structures) of an aquatic sedge plant native to Asia, Africa, and Australia. They are a staple ingredient in Chinese cuisine and widely used across Southeast Asian cooking, consumed both fresh and canned. In appearance, raw water chestnuts are walnut-sized, brown, and covered with a papery skin; the flesh inside is crisp, white, and mildly sweet with a flavour sometimes compared to a mild, slightly sweet apple. Unlike most vegetables, water chestnuts retain their distinctive crunch even after cooking — a quality prized in stir-fries and dumpling fillings.

Nutritional Value of Water Chestnuts

Water chestnuts provide approximately 97 kcal per 100 g, making them moderately energy-dense for a vegetable due to their starch content. They contain around 3 g of dietary fibre per 100 g and are a source of potassium, riboflavin (B2), vitamin B6, and copper. They provide small amounts of vitamin C, manganese, and phosphorus. Water chestnuts contain significant amounts of ferulic acid — a potent antioxidant polyphenol — as well as other phenolic compounds. They are very low in fat and contain no cholesterol. Their carbohydrate content comes primarily from starch and natural sugars.

Health Benefits of Water Chestnuts

Ferulic acid in water chestnuts is one of the most potent natural antioxidants, and research has associated it with anti-inflammatory, antimicrobial, and potential anticancer properties in laboratory settings. Potassium supports healthy blood pressure regulation. Vitamin B6 is important for protein metabolism, neurotransmitter synthesis, and immune function. The dietary fibre in water chestnuts supports digestive health. Despite their relatively higher calorie content, water chestnuts are satisfying and nutritious, and their crunch allows smaller quantities to provide textural interest in dishes.

How to Select and Store Water Chestnuts

Fresh water chestnuts should feel firm and heavy, with a smooth, intact skin and no soft spots. Peel to reveal the crisp white flesh before use. Fresh water chestnuts can be refrigerated in a dry container for up to a week, or peeled and kept in water (changed daily) for up to three days. Canned water chestnuts in water are the most convenient form for most people and are nutritionally comparable; drain and rinse before use. Open cans should have the chestnuts covered with fresh water and refrigerated, consumed within four days.

How to Use Water Chestnuts

Water chestnuts are most commonly used in Chinese and Southeast Asian stir-fries, spring rolls, dumpling fillings, soups, and braised dishes. Their retained crunch makes them a valuable textural contrast in dishes with softer ingredients. They can also be eaten fresh, sliced into salads, or coated and roasted as a snack. In Chinese cuisine, water chestnut flour is used as a thickening agent and in the traditional dim sum dish called water chestnut cake (ma ti go).