Coffee contains caffeine, a substance that stimulates parts of the body, especially heart and muscles. People often drink coffee to help them stay awake or keep them alert. Although coffee has some negative effects, it is not thought to be a harmful drink. Children and people who have heart problems should not drink coffee in great quantities. In decaffeinated coffee, the caffeine is extracted in a chemical process.


Words

  • although = while
  • contain = to have in it
  • decaffeinated = without caffeine
  • extract = take out
  • harmful = dangerous
  • process = to make a product ready to be sold 
  • quantity = amount
  • stimulate = to make something become active 
  • substance = stuff, material