The regular consumption of eight energy drinks a day may have contributed to a mild stroke in a middle-aged man in the UK.

Eight years after the health event, he still suffers from chronic numbness on the left side of his body.

"I obviously wasn't aware of the dangers," reported the anonymous patient in a case study.

"(I) have been left with numbness (in my) left-hand side, hand and fingers, foot and toes."

While it's not yet clear whether the man's energy drink habit directly caused the blood clot in his brain, these highly caffeinated beverages are known to raise blood pressure in the short term, and some scientists are concerned they may have a cumulative, chronic impact on the body.

When the man first presented to the emergency department with stroke symptoms in his 50s, his

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