If you’re a huge fan of energy drinks, you might want to listen up: a case study out today shows the perils of drinking too many of these caffeine-rich beverages.

An otherwise healthy 50-year-old man in the UK developed a stroke likely caused by his habit of eight energy drinks per day, according to his doctors. Though the man ultimately recovered from the injury, he continues to have some lingering symptoms years later. The doctors say his case should offer an important lesson that these drinks aren’t necessarily harmless.

“Energy drinks are not currently widely seen as dangerous for cardiovascular risks—they have been discussed because of their effect on sleep and concentration, but the public has little awareness of the more hidden risks they pose,” study author Martha Doyle, a stroke

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