A construction worker who drank four to five energy drinks every day for three weeks, was hospitalised with severe liver problems “likely” caused by excessively imbibing the seemingly harmless substance, researchers said Tuesday. The man had recently started taking four to five daily servings of “a common energy drink” to help him get through long days at work — the only change in his diet or habits, said a report in the journal BMJ Case Reports. An examination revealed the man had severe hepatitis, a type of liver inflammation, and possible liver damage.