Plant atlas Short
Star Fruit & Kidney Disease: A Real Danger
Star Fruit / Carambola · มะเฟือง · Averrhoa carambola
Star Fruit / Carambola — มะเฟือง (ma-fueang) — Averrhoa carambola.
Star fruit — มะเฟือง, mah-fueang. It's a tart, everyday fruit — and whether star fruit is safe to eat depends entirely on your kidneys. The edible part is the fresh fruit. It carries caramboxin, a natural neurotoxin, alongside oxalate — compounds that healthy kidneys filter while damaged kidneys may let them accumulate, and in advanced kidney disease even a single fruit has triggered seizures and lasting nerve injury. For everyone else the nutrition is ordinary: vitamin C that helps build collagen and supports normal immune function, fiber that keeps digestion moving and helps you feel full, and potassium that supports normal muscle and nerve function. In Thai kitchens the sour fruit turns up in Yam Ma-fuang, a salad of thin star fruit slices with shrimp, pork, and shallots in a lime-chili dressing, and in Ma-fuang Loi Kaeo, slices steeped in cold pandan-and-ginger syrup and served over crushed ice. If your kidneys are healthy, pick fruit with deep-yellow ribs and just-browning edges for the sweetest eating; greener fruit stays sour. Follow Longevity Biome for one Thai plant and one practical safety note every day.
Yam Ma-fuang — ยำมะเฟือง (yam-ma-fuang)
Ma-fuang Loi Kaeo — มะเฟืองลอยแก้ว (ma-fuang-loy-kaeo)
Source: Garcia-Cairasco N et al. (2013). Elucidating the neurotoxicity of the star fruit. Angew Chem Int Ed 52(49):13067-70. DOI:10.1002/anie.201305382 (PMID 24281890)
Educational content, not medical advice! Consult your doctor before changing diet or medication.
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Food and nutrients
Rich in: vitamin C, fiber, potassium
Research context
Star fruit contains caramboxin & oxalate — dangerous for people with kidney disease (seizures reported). Enjoy only with healthy kidneys. — Angew. Chem., 2013