Star Fruit (Carambola)

Written by on in Fruits

A waxy, golden-yellow tropical fruit of the Oxalidaceae family, recognized by its distinctive five-angled ribs that produce a perfect star shape when sliced crosswise. Its crisp, juicy flesh balances sweet and tart notes with a faintly floral aroma.

CategoryFruits
Scientific nameAverrhoa carambola
OriginTropical Southeast Asia (Malaysia, Indonesia, Sri Lanka, southern China)

History & Origins

Native to the Malay Peninsula and surrounding archipelagos, Averrhoa carambola has been cultivated for centuries across South and Southeast Asia and was documented in Chinese horticultural texts by the late Ming dynasty. Portuguese traders carried it to South Asia and East Africa in the 16th–17th centuries, and it was introduced to Florida in 1887, from where it spread through the Caribbean and into Latin American tropical lowlands in the 20th century.

Nutrition Facts

Per 100 g, edible portion (estimated)

  • 31 kcalCalories
  • 1.0 gProtein
  • 0.3 gFat
  • 6.7 gCarbs
  • 2.8 gFiber
  • 3.9 gSugars
  • 133 mgPotassium
  • 34.4 mgVitamin C
  • 3 mcgVitamin A

Culinary Uses

  • Eaten fresh and chilled as a refreshing snack
  • Pressed into juice, smoothies, and tropical punches
  • Sliced as a decorative garnish on salads, tarts, and cocktails
  • Pickled, salted, or cooked into chutneys in Sri Lankan and Indonesian cooking
  • Dried into translucent sweet-and-sour chips or candied as confectionery

Known Benefits

  • Excellent natural source of vitamin C and antioxidants (lutein, zeaxanthin, beta-carotene)
  • Low-calorie, fat-free source of dietary fiber
  • Provides B-complex vitamins including folate and riboflavin
  • Contains polyphenols and flavonoids associated with anti-inflammatory effects

Hidden Benefits

  • Naturally rich in oxalic acid, which gives the fruit its sharp tang
  • Contains a unique amino acid, caramboxin, with mild neuroactive properties
  • Source of a galactose-specific lectin studied for antimicrobial activity
  • Used in Brazilian and Caribbean folk medicine to soothe coughs and fevers

Cautions & Considerations

  • Toxic to patients with impaired kidney function due to caramboxin, which can cause hiccups, confusion, and even fatal encephalopathy
  • Contraindicated for individuals on dialysis and those with severe CKD
  • High oxalate content may aggravate kidney-stone risk in susceptible people
  • May interact with statins and other CYP3A4-metabolized drugs