Within half an hour of drinking Rockstar, the top selling energy drink in the US, levels of the 'fight or flight' hormone noradrenaline in their blood also increased by almost 74 per cent.
Comparably, when they drank a fake energy drink, levels of the hormone increased by 31 per cent.
Noradrenaline - normally only released in times of stress - increases blood pressure and the heart's ability to contract, and increases arousal and alertness in the brain.
After drinking the energy drink, young people saw their blood pressure increase by 6.4 per cent, compared to just 1 per cent with the fake drink .... http://www.dailymail.co.uk
