Risks associated with energy drinks..(read Red Bull)

Red Bull,the caffeine-loaded beverage,popular with students and adrenaline sport fans to give them extra energy causes the blood to become sticky, a pre-cursor to cardiovascular problems such as stroke.

"One hour after they drank Red Bull, (their blood systems) were no longer normal. They were abnormal like we would expect in a patient with cardiovascular disease," Scott Willoughby, lead researcher from the Cardiovascular Research Centre at the Royal Adelaide Hospital, told the Australian newspaper.

Red Bull is banned in Norway, Uruguay and Denmark because of health risks listed on its cans, but the company last year sold 3.5 billion cans in 143 countries. One can contains 80 mg of caffeine, around the same as a normal cup of brewed coffee.
The Austria-based company, whose marketing says "Red Bull gives you wings," sponsors Formula 1 race cars and extreme sport events around the world, but warns consumers not to drink more than two cans a day.
Rychter said Red Bull could only have such global sales because health authorities across the world had concluded the drink was safe to consume.
But Willoughby said Red Bull could be deadly when combined with stress or high blood pressure, impairing proper blood vessel function and possibly lifting the risk of blood clotting.
"If you have any predisposition to cardiovascular disease, I'd think twice about drinking it," he said.