STARFRUIT is a known kidney toxin. A PKD'r is now in renal failure after eating starfruit. If your kidney function is impaired, eating starfruit could be deadly. Symptoms of star fruit intoxication include persistent hiccups, nausea, vomiting, agitation, insomnia, mental confusion & convulsions usually occurring within 1-5 hours. Starfruit nightshade poisoning is brought on by high levels of oxalic acid that accumulates in weakened kidneys. Seek medical attention if hiccups develop after eating starfruit. Scientists have been able to determine caramboxin is a neurotoxin that resembles the amino acid phenylalanine.