Energy drinks linked to more heart, blood pressure changes than caffeinated drinks alone. With more than 500 types of energy drinks on the market, there has been an increase in energy-drink-associated emergency room visits and deaths, prompting questions about their safety, researchers have said.

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Energy drinks linked to more heart, blood pressure changes than caffeinated drinks alone. With more than 500 types of energy drinks on the market, there has been an increase in energy-drink-associated emergency room visits and deaths, prompting questions about their safety, researchers have said.