Healthy Man Suffers Stroke After Energy Drink Habit

A 54-year-old man, who appeared to be in great health, suddenly experienced weakness on his left side, numbness, and trouble with balance and speech. His family quickly took him to a nearby stroke clinic.

Dr. Sunil Munshi, a consultant at Nottingham University Hospitals NHS Trust, noted that his blood pressure was alarmingly high at 254 over 150 mmHg. Despite his fit appearance, the high numbers highlighted how hypertension can be deceptive, often referred to as the “silent killer.”

This individual, whose identity is kept confidential, worked as a warehouse employee in Sherwood, Nottingham. Munshi authored a case report on this incident, recently published in BMJ Case Reports.

For adults, typical blood pressure should be under 120 over 80 mmHg, while anything at 180 over 120 or above constitutes a medical emergency.

The patient had numbness on one side, and scans revealed a stroke in a deeper brain area known as the thalamus, which contributed to his instability. He was treated with multiple medications until his blood pressure decreased to 170.

However, upon returning home, his blood pressure shot back up to 220, despite being on various medications. After weeks of extensive tests yielding no answers, he finally mentioned his heavy consumption of energy drinks.

“He was drinking eight potent energy drinks each day, consuming two cans at four different points during the day,” Munshi explained, although the brand name was not mentioned in the report. Each drink contained 160 mg of caffeine, which helped clarify the diagnosis.

Some energy drinks can have as much as 500 mg of caffeine, in stark contrast to the 30 mg found in tea and 90 mg in coffee. Dr. Martha Coyle, who contributed to the study, pointed out that UK guidelines recommend a daily caffeine limit of 400 mg, roughly equivalent to two to four cups of coffee. This man was consuming around 1,200 to 1,300 mg—three times more than recommended.

Similarly, the FDA in the U.S. advises keeping caffeine intake to a maximum of 400 mg per day.

Remarkably, just weeks after he stopped drinking energy drinks, his blood pressure normalized. While he is healthy now, he still deals with the residual effects of his stroke.

“I wasn’t aware of the harm that energy drinks were inflicting on me,” he told his medical team. “Even eight years later, I still experience numbness on the left side of my body.”

But it’s not solely caffeine’s excessive amounts that pose risks. Munshi noted that many energy drinks also include ingredients like the amino acid taurine that can raise blood pressure. The combination of caffeine and taurine can generate significantly higher blood pressure than caffeine alone. Many energy drinks are also loaded with glucose, which can damage blood vessels over time, potentially leading to heart issues.

Additionally, other common ingredients include ginseng, which impacts metabolism, and guarana, a plant that has caffeine concentrations nearly double that of coffee beans. Milder stimulants are also often present, such as theophylline and theobromine.

Such energy drinks may lead to serious heart problems and can cause blood clots, especially when combined with elevated glucose levels. Many younger individuals experiment with these drinks, often mixing them with drugs like cocaine or methamphetamine, which can create hazardous consequences.

This case, while concerning, is not unique. Munshi pointed out that the medical literature contains numerous accounts of energy drink-related health issues, including irregular heartbeats and strokes caused by blood clots.

He believes healthcare providers should be more vigilant when assessing energy drink consumption, particularly during check-ups with younger patients experiencing cardiovascular issues or strokes. “These drinks are evolving into more potent and dangerous forms,” he noted, advocating for stricter regulations on their sale and marketing aimed at younger audiences.