Star fruit (carambola)

Star fruit (carambola)

FamilyOxalidaceae
Importance
Starfruit is the crisp yellow fruit of Averrhoa carambola, valued for its star-shaped slices, tart-sweet flavor, high water content, vitamin C, fiber, potassium, copper, organic acids, and tropical fruit polyphenols. Per 100 g, raw starfruit provides about 31 calories, 6.7 g carbohydrate, 2.8 g fiber, 1.0 g protein, and very little fat. Its natural sugars occur within a water-rich fruit matrix that includes soluble fiber, insoluble fiber, citric acid, malic acid, oxalic acid, minerals, and phytochemicals. The fruit is commonly eaten fresh, sliced into salads, blended into juices, added to fruit bowls, or used as a tart garnish.

Starfruit supports everyday nourishment through vitamin C, fiber, hydration, potassium, and antioxidant-active plant compounds. Vitamin C contributes to collagen formation, antioxidant recycling, immune barrier function, and connective tissue maintenance. Fiber supports digestive movement, stool bulk, and microbial fermentation. Potassium supports fluid balance, nerve signaling, and muscle contraction. Copper participates in connective tissue enzyme systems, iron handling, and redox balance. Organic acids give starfruit its bright tartness and support its distinctive citrus-like flavor.

For cancer and ailment-support nutrition, starfruit is relevant because Averrhoa carambola contains vitamin C, flavonoids, proanthocyanidins, gallic acid derivatives, quercetin derivatives, epicatechin-related compounds, apigenin-related compounds, pectin, organic acids, and antioxidant-active polyphenols. These compounds connect to Nrf2-related antioxidant response, NF-kB inflammatory signaling balance, AMPK-linked metabolic regulation, insulin-related carbohydrate handling, endothelial function, phase II detoxification enzyme signaling, apoptosis-related cell signaling, and gut fermentation pathways supported by fiber. Starfruit does not act as a standalone disease solution, but the whole fruit contributes hydration, vitamin C, digestive fiber, minerals, and plant compounds tied to cellular repair, inflammatory signaling balance, vascular support, digestive function, and normal metabolic regulation.

Starfruit pairs well with citrus, mango, pineapple, papaya, berries, cucumber, mint, ginger, leafy greens, oats, and whole grains. Its strongest nutritional identity is the combination of crisp tropical texture, low calorie density, vitamin C, fiber, organic acids, potassium, copper, flavonoids, and Averrhoa-family phytochemicals connected to antioxidant, digestive, vascular, metabolic, inflammatory, and cellular defense pathways.
Region FoundStarfruit Averrhoa carambola is native to tropical Southeast Asia and is widely cultivated in Malaysia, Indonesia, the Philippines, Thailand, Vietnam, India, Sri Lanka, southern China, Taiwan, Brazil, the Caribbean, Central America, Florida, Hawaii, and other warm frost-free tropical or subtropical regions with well-drained soils and consistent moisture.
Helps Fight These Cancers: Oral Cavity Pharynx Larynx Cancer, Gastric Cancer, Colon Cancer
Helps Fight These Ailments: Hypertension, Hyperlipidemia, Insulin Resistance
Linked Hormones:

All values per 100g
Nutrition Facts
Calories (kcal)31
Protein (g)1.04
Carbohydrates (g)6.73
Fiber (g)2.8
Sugars (g)3.98
Total Fat (g)0.33
Saturated Fat (g)0
Vitamins
Vitamin A (µg RAE)3
Vitamin C (mg)34.4
Vitamin D (µg)0
Vitamin E (mg)0.15
Vitamin K (µg)0
Vitamin B1 / Thiamin (mg)0.014
Vitamin B2 / Riboflavin (mg)0.016
Vitamin B3 / Niacin (mg)0.367
Vitamin B5 / Pantothenic Acid (mg)0.391
Vitamin B6 (mg)0.017
Vitamin B7 / Biotin (µg)0
Folate B9 (µg)12
Vitamin B12 (µg)0
Vitamin Detail Pages
Minerals
Calcium (mg)3
Iron (mg)0.08
Magnesium (mg)10
Phosphorus (mg)12
Potassium (mg)133
Sodium (mg)2
Zinc (mg)0.12
Copper (mg)0.137
Manganese (mg)0.037
Selenium (µg)0
Iodine (µg)0
Mineral Detail Pages
Amino Acids
Alanine (mg)0 mg
Arginine (mg)0 mg
Asparagine (mg)0 mg
Aspartic Acid (mg)0 mg
Cysteine (mg)0 mg
Glutamic Acid (mg)0 mg
Glutamine (mg)0 mg
Glycine (mg)0 mg
Histidine (mg)0 mg
Isoleucine (mg)0 mg
Leucine (mg)0 mg
Lysine (mg)0 mg
Methionine (mg)0 mg
Phenylalanine (mg)0 mg
Proline (mg)0 mg
Serine (mg)0 mg
Threonine (mg)0 mg
Tryptophan (mg)0 mg
Tyrosine (mg)0 mg
Valine (mg)0 mg
Amino Acid Detail Pages
Phytochemicals
Vitamin C, flavonoids, proanthocyanidins, gallic acid derivatives, quercetin derivatives, epicatechin-related compounds, apigenin-related compounds, pectin, soluble fiber, insoluble fiber, citric acid, malic acid, oxalic acid, organic acids, potassium, copper, magnesium, calcium, and Averrhoa carambola antioxidant-active polyphenols. Research references: Shui G, Leong LP. Residue from star fruit as valuable source for functional food ingredients and antioxidant nutraceuticals. Food Chemistry. 2006. Muthu N, Lee SY, Phua KK, Bhore SJ. Nutritional, medicinal and toxicological attributes of star-fruits Averrhoa carambola L.: a review. Bioinformation. 2016. Lim YY, Lim TT, Tee JJ. Antioxidant properties of several tropical fruits: A comparative study. Food Chemistry. 2007.
Research & Notes
Research Notes:
USDA FDC via MyFoodData per-100 g panel.
Notes:
Raw carambola flesh (without seeds); per 100 g.
Created: 2025-10-21 11:26:22
Last Updated: 2026-06-04 08:05:23