First spotted by Gizmodo, a recently released case study details the startling health issues of a man in his 50s who drank eight energy drinks a day. Described as “normally fit and well,” the man suddenly had a stroke after consuming an average of 1280mg of caffeine a day, or over three times the healthy limit. According to the report, the man first noticed the side effects when the left side of his body went numb. After going a week without any energy drinks, doctors said his blood pressure began returning to normal. It’s a pretty grim warning for anyone who habitually downs the high-voltage brews: you may enjoy the buzz, but your body might not.