Heart Risks Raised by Just One Energy Drink, Study Suggests

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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. Norepinephrine is released by the adrenal glands and raises blood pressure; it is a cousin of the hormone adrenaline.

One Rockstar energy drink contains 240 milligrams of caffeine, along with other stimulants, including 2,000 mg (0.7 ounces) of taurine and extracts of guarana seed, ginseng root and milk thistle, according to the study. [5 Health Problems Linked to Energy Drinks]

To test the effects of the drink, the researchers recruited 25 healthy adults to participate in the study. On two separate days, the researchers measured the volunteers’ blood pressure, heart rate and blood levels of caffeine, glucose and norepinephrine. The researchers then asked the participants to consume either the energy drink or a placebo. The placebo was similar in taste, texture and color to the energy drink, but did not contain caffeine or other stimulants.

Thirty minutes after the participants finished each drink, the researchers repeated their measurements. The volunteers also underwent several tests that increased their physical and mental stress. During these stress tests, the researchers once again measured blood pressure and heart rate.

After consuming the energy drink, the participants’ systolic blood pressure increased, on average, by 6.6 points (from 108.4 mm Hg to 115.0 mm Hg), compared with an average increase of 3.3 points (from 108.3 mm Hg to 111.6 mm Hg) after drinking the placebo.

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