The case of a 17-year-old who overdosed on caffeine after drinking seven cups of espresso brings attention to the oft-unrecognized dangers of overconsumption of caffeinated drinks, the BBC reported Aug. 14.

Jasmine Willis, 17, said she began sweating profusely, hyperventilated, and experienced uncontrolled emotional mood swings after downing multiple cups of strong coffee. While people like singer Robbie Williams claim to drink dozens of cups of coffee daily, health experts say that even a few cups of coffee can cause restlessness, insomnia, nausea, vomiting, or other problems. A serious overdose could entail delirium or seizures.

A dose of about 90 milligrams of caffeine per two pints of blood could even be fatal, but you'd have to drink 200 cups of instant coffee in a day to hit that level. 

"Provided it's taken in moderation we don't need to see coffee as a threat to health, but the recommendation is enjoy in moderation," said a spokeswoman for the British Dietetic Association.