A British man with an obsessive thirst died after drinking three litres of cola a day, an inquest was told.
Paul Inman, 30, walked to the shops several times each day to buy the drink and also downed many glasses of water.
This caused his lungs to swell to four times their normal weight. The pressure restricted his breathing, and he died in his sleep, a pathologist said.
Mr Inman's excessive drinking was the result of his Asperger's syndrome - a form of autism.
He was found dead in his flat at Three Sisters Care Home in Haworth, West Yorkshire, by a care worker on March 10 last year.