Hi E.,
www.foodreference.com says
"Star fruit originated in Southeast Asia and is readily available in Taiwan. Star fruit causes several symptoms in patients with chronic renal failure or end-stage renal disease. The symptoms vary and include insomnia, intractable hiccups, agitation, muscle weakness, confusion, consciousness disturbances of various degrees, seizures, and cardiorespiratory arrest. The various star fruit subspecies contain different toxins, including a POWERFUL NEUROTOXIN that is suspected to accumulate in blood, cross the blood-brain barrier in chronic renal failure patients, and eventually cause irreversible damage.
Star fruit intoxication is a neglected but serious fruit intoxication frequently observed in patients with chronic renal failure. Because no effective treatment is currently available, patients— especially those who are newly diagnosed with chronic renal failure or end-stage renal disease—must be warned not to ingest star fruit, even in small amounts."
I realize that what you asked is not directly related to this but thought I'd throw it out there if someone decides they'll experiment with exotic fruit!!!
M.