(NEWSER) – When an unidentified man in his 20s in Kyushu, Japan, died suddenly and inexplicably in the fall of 2014, police ordered an inquest into the cause of his death. Now Dr. Shinichi Kubo, a professor of forensics at Fukuoka University, is announcing that it appears to be the country's first documented case of fatal daily caffeine consumption, reports Japan Times.

"We had never heard of fatal caffeine intoxication," the Health, Labor and Welfare Ministry said. The man, who worked midnight to dawn at a 24-hour gasoline station, had vomited on multiple counts in the year leading up to his death; Japan Times reports such vomiting can signal caffeine intoxication. The actual quantity of caffeine he consumed on the day of his death and in general is unknown.

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