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A study last year showed that energy drinks can change heart rhythms. A team of researchers at the University of Bonn in Germany scanned the hearts of 17 people an hour after they’d consumed an energy drink. They found the left ventricle of the heart, which pumps blood around the body, was contracting harder after the drink. Frane’s public health agency has said young people who drink energy drinks are at risk of sleep disorders, daytime drowsiness and developing addiction to other substances.