Coffee shop caffeine levels 'vary widely'

High Street coffee shops could pose a risk to pregnant women because of big variations in the amount of caffeine in each cup, research suggests. 

Analysis of espresso coffee from 20 shops found that one was six times stronger than others.

The Food Standards Agency (FSA) says too much caffeine can result in miscarriage or a low birth weight.

Researchers from Glasgow University tested caffeine levels in espressos bought from High Street coffee shops.

The FSA currently advises pregnant women to consume no more than 200mg of caffeine a day, based on an assumption that an espresso contains about 50mg of caffeine.     Full Read