Key points from article :
Drinking three cups of coffee a day may help you live longer.
Study of almost half a million people from 10 European countries.
Effect seen even if it is decaffeinated.
Particularly linked to a lower risk of heart and gut diseases.
An extra cup of coffee could extend life by 1 or 3 months for women and men respectively.
The study was published in the Annals of Internal Medicine journal.