A man once died of starvation because he only ate celery!

Upon hearing that celery takes more calories to digest than it contains, Bo Thomas decided to go on the “celery” diet to lose weight. Every day, he took a trip to the local Wal Mart to pick up fresh celery and ate only that. According to friends, he had indeed started to lose weight.

However, soon enough, he was found dead in his home. The official coroner’s report listed the cause of death to be “starvation.” Details from the coroner’s report revealed that Thomas had eaten so much celery that his body had used up all it's energy trying to digest the celery. This caused a lethal negative calorie state that was unsustainable and resulted in the man’s death. So technically, since his body took in no energy and that’s what killed him, he did indeed die from starvation.

(Source)