Can coffee protect drinkers from Alzheimer's and Parkinson's? A new study finds an evidence that certain types of coffee could prevent mental decline later in life، as the Technical Times said. Plenty has been said about the benefits and risks of coffee، a common beverage that a large portion of the population consumes on a regular basis. In the United States، 54 percent of adults drink one or more cups of coffee every day. Apparently، coffee does more than just to wake people up in time for work or school. It also protects the brain from cognitive impairment later in life. "Coffee consumption does seem to have correlation to a decreased risk of developing Alzheimer's disease and Parkinson's disease،" said Donald Weaver، co-director of the Krembil Brain Institute in Canada and a co-author of the study. "But we wanted to investigate why that is — which compounds are involved and how they may impact age-related cognitive decline." For the study، Dr. Weaver and his team tested three different types of coffee: caffeinated dark roasted، caffeinated light roast، and decaffeinated dark roast. They first eliminated the possibility that caffeine is the element that improves thinking and prevents cognitive impairment in coffee drinkers. Instead، the researchers focused on the compound called phenylindanes، which are formed when coffee beans are roasted. The same compound is also responsible for the beverage's bitter flavor.