A can of Red Bull might give you wings, but it might also give you a host of heart-related health risks.
According to a study published Nov. 8 in the Journal of the American Medical Association, consuming just one energy drink results in a significant increase in blood pressure. Those acute spikes, the study's authors wrote, may put energy drink fans at increased cardiovascular risk — though they'll require further research to make any conclusions.
The participants — all healthy, nonsmoking, medication-free adults — were asked to drink one can of Rockstar Energy Drink and one similar-tasting, caffeine-free placebo drink within five minutes, in random order, on two different days over a span of two weeks. The researchers recorded various cardiovascular data, including heart rate and blood pressure, before and after the participants consumed the drinks.
A single can of Rockstar, they discovered, produced an average blood pressure increase of 6.4% — more specifically, a 6.2% spike in systolic blood pressure and a 6.8% spike in diastolic blood pressure. The placebo drink, meanwhile, only raised participants' blood pressure by an average of 1%. The Rockstar also led to a 74% jump in levels of noreprinephrine, a hormone that increases blood pressure — significantly higher than the 31% spike caused by the placebo drink. Heart-rate increases were fairly even between the Rockstar and the placebo drink.
"These acute hemodynamic and adrenergic changes may predispose to increased cardiovascular risk," the authors wrote. "Further research in larger studies is needed to assess whether the observed acute changes are likely to increase cardiovascular risk."
So Rockstar, Red Bull and Monster probably aren't great for our hearts. But is it OK to consume energy drinks the same way we binge occasionally on bacon, pizza and late night pad thai — that is to say, in moderation?
"I bet a lot of people don't realize how much caffeine they're getting," Goldberg told Mic, noting that a typical energy-boosting beverage can contain three to five times the amount of caffeine found in a standard cup of coffee. "It's a little hard to say if people can do that in moderation. I, of course, advise against it."
Caffeine, Goldberg said, increases blood pressure — a risk factor for stroke and heart attacks. Goldberg has also treated patients with racing heart rates caused by energy drink-induced caffeine boosts. But caffeine isn't the only harmful ingredient. Loaded with sugar, energy drinks can contribute to weight gain.
"I think people need to be more aware of potential side effects," Goldberg said.
Not all health gurus completely shy away from the drinks. Wellness expert John Rowley, certified personal trainer and author of The Power of Positive Fitness and Climb Your Ladder of Success Without Running Out of Gas, had, in fact, just finished drinking a Monster when Mic reached him by phone.
Rowley said he drinks a Monster one or two times a week. He pointed out some of the benefits of caffeine, such as increased metabolism and body temperature, the latter of which might help burn calories.
A regular gym-goer, Rowley typically uses a blender to mix together Monster, protein powder, the essential fatty acid MCT oil, fiber, ice and blueberries. "I make it into a protein smoothie," he said. "Having all that stuff combined lessens the effect of the caffeine. The fats and protein slow down digestion."
As long as you understand the way your body reacts to caffeine, it's OK to have an energy drink now and then, Rowley advised. Just don't go crazy.
"It's like when doctors say red wine is good for you," he said. "They don't mean a bottle — they mean a glass."
Given the recent findings, some may still choose to go cold turkey. Mic asked Goldberg about a natural energy boost people ought to try instead. Is there a magical, healthy alternative to those syrupy-sweet acid-green and electric-blue concoctions?
"Maybe," she suggested, "they should get enough sleep."