Study looks at caffeine effects

Little is known about the amount of caffeine consumed in the UK

One of the biggest studies into the effects of caffeine on health is being launched this week.

Around 16,000 men and women in Bristol will be chosen at random to answer questions about their caffeine habits.

The study will look at the drug's effect on a range of areas including sleep patterns.

Scientists at the University of Bristol claim caffeine, which is found mainly in coffee, tea and cola, is the most widely-consumed drug in the world.

But little is known about the amount of caffeine consumed in the UK and the implications for health.

'National institution'

Peter Rogers, Professor of Biological Psychology, said: "The consumption of tea is a national institution in the UK and coffee houses have sprung up all over our high streets.

"However, ask anyone how much caffeine they consume in their diets and they'll find it hard to answer.

"We need people's help to increase our understanding of caffeine and the effects on health, well-being and sleep."

The Dietary Caffeine and Health Study is funded by the Biotechnology and Biological Sciences Research Council (BBSRC).