The Dangers of Energy Drinks: A Wake-Up Call

If you’re a big fan of energy drinks, you might want to pay attention: a recent case study reveals potential risks associated with overindulging in these caffeinated beverages.

A typically healthy 50-year-old man in the UK suffered a stroke, which his doctors attribute to his daily consumption of eight energy drinks. While he managed to recover, he still experiences some lingering symptoms years later. This case highlights that energy drinks might not be as harmless as many believe.

“Energy drinks aren’t widely regarded as harmful in terms of cardiovascular health—most discussions focus on their effects on sleep and focus. However, the public remains largely unaware of their hidden risks,” explained Martha Doyle, a stroke doctor at Nottingham University Hospitals NHS Trust.

No Other Clear Cause

Published in BMJ Case Reports, the study detailed how the man arrived at the hospital with sudden numbness on one side and an unsteady gait, alongside alarmingly high blood pressure of 254/150. For perspective, a normal blood pressure reading is around 120/80; anything over 180/120 is considered a “hypertensive crisis.” Medical tests confirmed he had suffered a mild stroke.

He spent three days in the hospital and was sent home with medications to manage his blood pressure and reduce the risk of another stroke. Despite having some recovery during follow-up visits, he still exhibited numbness and persistently high blood pressure, leading to a subsequent hospital readmission for more medication.

During a deeper investigation into his lifestyle, the man revealed his love for energy drinks, averaging eight each day, with each containing 160 milligrams of caffeine. This totals around 1.3 grams of caffeine daily—over three times the recommended limit of 400 milligrams for adults.

Surprisingly, despite being fit and lacking any significant risk factors like smoking or heavy drinking, doctors couldn’t find any other definitive causes for his stroke except for his exceptionally high blood pressure. Therefore, it seems pretty likely that the man’s energy drink consumption played a role in raising his blood pressure and triggering the stroke.

“We conclude that this patient’s stroke was due to his energy drink intake since extensive tests ruled out other identifiable causes,” Doyle said.

Fortunately, the man decided to quit energy drinks. Within a week, his blood pressure started to normalize, and it remained stable after getting off antihypertensives, supporting the idea that the drinks had been a significant factor. Later check-ups indicated he made a full recovery without further strokes, and even after eight years, his blood pressure remains normal.

Still, he continues to experience some numbness. “I wasn’t aware of the dangers these energy drinks posed to my health. I’m left with numbness in my left side, fingers, and toes even after all this time,” he noted in a personal reflection accompanying the report.

A Necessary Warning

Doctors identified several ways that energy drinks can elevate the risk of stroke and cardiovascular issues. These are mainly linked to the high caffeine and sometimes sugar content.

Excessive caffeine might lead to a long-term increase in blood pressure, and it can cause sudden constriction of blood vessels or even induce an irregular heartbeat. Ingredients like taurine and ginseng may enhance caffeine’s effects, while others such as guarana can contain unknown quantities of caffeine.

Notably, there have been some prominent cases of heart problems connected to energy drinks. For example, from 2022 to 2023, at least two deaths in the U.S. were tied to Panera Bread’s “Charged Lemonade,” which is heavily caffeinated. The item was eventually removed from the menu, and the company settled the resulting lawsuits.

That said, the report’s authors argue that, similar to their patient, the general public is often unaware of the potential health risks these drinks pose. There’s even a chance these risks might necessitate stricter regulations or advertising guidelines, especially since energy drinks are frequently marketed towards children.

“We can’t definitively say if health authorities should intervene based solely on this case,” Doyle remarked. “However, it would be beneficial to raise awareness so that similar situations can be addressed. The public deserves to know the risks associated with their consumption.”

Speaking for myself, I love my morning and sometimes afternoon coffee, so I’ll definitely make an effort to monitor my daily caffeine intake from here on out.