Coffee enthusiasts in Glasgow may be unwittingly sailing through their daily caffeine quotas thanks to unusually strong brewing habits, with Scottish coffee even outdoing the enthusiastic Italians when it comes to strength.
A research, which compared coffee strength in Span and Italy to Scottish blends, found that an espresso in the Scottish shops surveyed had a caffeine level that varied wildly between 72mg and 212mg per cup, while Spanish and Italian coffees peaked at 135mg per cup.
The caffeine content of cappuccinos purchased in Scotland varied from 101mg to 275mg per cup.
Source: http://www.lifehacker.co.uk/2014/07/22/glaswegian-coffee-among-strongest-europe