Caffeine drinks: a warning

from today's Times ... we're talking Red Bull (80mg caffeine per can*), Relentless (160mg), Cocaine (240mg per can) ... also Coke (35mg), and to some extent coffee (although you sip that because it's hot, whereas these cooled drinks are gulped, often several times a day):

Scott Willoughby, of the Cardiovascular Research Centre in Adelaide, Australia, recently showed how the sugar-free version of Red Bull can cause the blood to thicken, raising the risk of heart attacks and strokes.

In his study, Willoughby assessed the cardiovascular systems of 30 young adults one hour before and one hour after they had drunk a 250ml can of sugar-free Red Bull. He describes the results as "remarkable". Sixty minutes after drinking the Red Bull, the subjects displayed the kind of cardiovascular abnormalities that might be expected in a patient with heart disease, including an increased stickiness of blood.

"If you add in other risk factors for cardiovascular disease - stress or high blood pressure - this could be potentially deadly," Willoughby says. "The can comes with a warning of its own. But if you have any predisposition to cardiovascular disease, I'd think twice about drinking it."


*Caffeine stats from Professor Roland Griffiths, of The Johns Hopkins University, Maryland, USA. He found 505mg of caffeine in an American canned drink called Whoop Ass.

There's not much official UK guidance on this - according to The Times, just two pointers: any drink containing more than 150mg of caffeine per litre has to say so on UK labels; & the FSA advises pregnant women not to consume more than 300mg/caffeine per day.