Here is a rough guide to help you work out your intake:
One can of cola: 80 mg
One cup of tea: 75mg
One cup of instant coffee: 100mg
One cup of filter coffee: 140mg
One can of energy drink: 80mg
One 50g bar milk chocolate: 25mg
One 50g bar dark chocolate: 50mg
Coffee came from Ethiopia (around the ninth century AD). One legend has it that a goat herder named Kaldi realised his animals were far more activate after eating coffee plants so tried it himself.
It reached Europe sometime in the 17th century: the first English coffee house opened in Oxford in 1650 and played an important part in some social reforms ... strange to think that nowadays we are signing petitions against Starbucks and Costa invading our high streets!