title_body: What are the heath risks associated with grinding coffee beans a year after their sell by date?
upvoted_answer: Normally, the main reason that roasted coffee has a shelf life is its freshness. If the package is properly closed it is mostly safe. Your concern should be its flavor which should be faded away already.
  
  However, you must also think about the mold that may cover the beans. Mold may grow on coffee beans or ground coffee in time. It may cause allergic reactions according to this site or even more. This site includes a guide how to remove mold from coffee beans -however this method affects the flavor.
  
  Maybe a physician could be more helpful about the health effects of mold.