Compléter The world of properly wordsVersion en ligne Here you have to choose the best option to complete the text. par LINA MARIA GIRALDO SALAZAR 1 when since mustn't While most among drinking described Coffee is popular around the world . Over the past centuries , few subjects have been as carefully studied as coffee . It's important component is the caffeine and it has lots of benefits . Coffee has been well - known the beginning of the 14th century , Sufi Yemenis started using coffee to stay alert during special activities . It became a popular medicine Europeans in the 1600s . Caffeine was first in the 1800s by Ferdinand Runge , a doctor that found out some effects that coffee has on people . Some people say coffee isn't good , but doctors say you believe this . Thanks to caffeine you don't get hungry . Coffee can also reduce headaches and blood problems . many people believe coffee is bad , studies show it is good for your heart .