Like the caffeine in the coffee, Coffee people are highly energetic, with tons of mental energy just zapping everywhere. This makes them move quicker, talk faster, learn more, and be more expressive than the average bear. ;)
The challenge in this life is to take that energy and ground it into form, something substantial. Beware of becoming an information addict; true experience is so much richer. They're too at home in the realm of ideas, they must start looking at the earth. Meditation and very clear goals helps.