Extract from the Telegraph:
"Fears have been raised over the safety of high-caffeine energy drinks after an inquest heard they could have brought on a fatal heart attack.
Alfredo Duran, 40, who drank four cans of Red Bull every night, collapsed and died after working a supermarket night shift.
An inquest into his death heard that he had an enlarged heart and that caffeine may have triggered an attack.
Dr Ian Roberts, a pathologist, said the amount of Red Bull Mr Duran drank could have contributed to his death.
Levels found during the post mortem examination were not fatal, but were dangerous for a man with an underlying heart condition.
He said: "For an individual with this condition, the risk of problems with the heart is increased by stimulants such as caffeine and may be triggered by levels which would have no effect on people with a normal heart.
"My feeling is, given the evidence available, it was a cardiac arrest, possibly contributed by sub-toxic caffeine ingestion.""