EGGPLANT (Solanum melongena) or aubergine or brinjani is a nightshade plant that is high in oxalates and purines. These increase the chances of developing kidney stones. There is also a kidney shut down from too many oxalates. Symptoms of this include persistent hiccups, nausea, vomiting, agitation, insomnia, mental confusion and convulsions that occur within one to five hours of eating the fruit. This can happen with PKD and seems to come about from the high levels of oxalic acid (or oxalate) in this fruit that accumulates in weakened kidneys. To be safe, try to avoid all nightshade plants.