Heart Risks Raised by Just One Energy Drink, Study Suggests

Having just one energy drink can cause short-term changes in healthy adults that, over time, could increase the risk of heart disease, a new study finds. In the study, participants who drank one 16-ounce (480 milliliters) can of Rockstar energy drink showed increases in blood pressure and levels of the hormone norepinephrine, compared with before they consumed the drink. One Rockstar energy drink contains 240 milligrams of caffeine, along with other stimulants, including 2,000 mg (0.7 ounces) of