A 40-year-old supermarket worker died of a heart attack after drinking as many as four cans of Red Bull energy drink each night, the Daily Mail has reported.

Pathologist Dr. Ian Roberts said this week Alfredo Duran, 40, of Wheatley in Oxford, England, had an enlarged heart and the excessive caffeine he consumed each day may have contributed to his death.

"My feeling is - given the evidence available - it was a cardiac arrest possibly contributed to by subtoxic caffeine ingestion," Roberts told the Daily Mail.

Each can of Red Bull is said to contain 80mg of caffeine - about the same amount as a cup of coffee.

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