Longan is a tropical evergreen fruit in the Sapindaceae family, prized for its juicy, translucent, musky-sweet white flesh surrounding a single glossy dark seed; it is closely related to lychee and rambutan. Marketed fresh, dried, and canned, it is a staple in Chinese, Thai, and Vietnamese pantries.
History & Origins
Longan has been cultivated for more than two thousand years in southern China, with references appearing in Han Dynasty poetry and materia medica as a tonic fruit. It diffused southward into Thailand, Cambodia, Vietnam, and Myanmar, and was later introduced to Taiwan, where the 'Fengyuan' cultivar became globally dominant. By the late 19th century, longan was established in Hawaii and Florida, and modern production centers on Thailand, China, and Vietnam.
Nutrition Facts
Per 100 g, edible portion (estimated)
- 60 kcalCalories
- 1.31 gProtein
- 0.1 gFat
- 15.14 gCarbs
- 1.1 gFiber
- 14.0 gSugars
- 266 mgPotassium
- 84 mgVitamin C
- 0 mcgVitamin A
Culinary Uses
- Eaten fresh as a cooling snack, often chilled
- Dried longan (longan rou) steeped in Chinese herbal soups and tonic teas
- Added to sweet sticky rice, jellies, and shaved-ice desserts in Thailand and Vietnam
- Used in bubble tea, syrups, and dessert soups with lotus seed and barley
- Fermented into wines and liqueurs in southern China and Taiwan
Known Benefits
- Very high vitamin C content supports immune function and collagen synthesis
- Source of potassium for fluid balance and muscle function
- Contains polyphenols and flavonoids that act as antioxidants
- Traditionally used in Chinese medicine to nourish blood and calm the mind
Hidden Benefits
- Corilagin and ellagic acid derivatives studied for antiviral and anti-inflammatory activity
- Polysaccharide fractions show immunomodulatory potential in vitro
- Polyphenols may inhibit advanced glycation end-products (AGEs) implicated in aging
Cautions & Considerations
- High free-sugar load makes fresh and dried fruit unsuitable in large quantities for diabetics
- Rare hypersensitivity reactions reported in individuals sensitive to other Sapindaceae fruits
- Dried longan is calorically dense and may contribute to excess sugar intake
- Unripe fruit contains higher tannin levels that can cause mild gastrointestinal upset
