Today we have more good news for all our coffee drinkers around the world. (20） Researchers at the Harvard School of Public Health recently discovered that drinking between three and five cups of coffee a day may prevent certain illnesses. They found that coffee can protect against heart disease, brain diseases, type 2 diabetes and suicide. Walter Willett, a nutrition researcher at Harvard and the co-author of the study, says the findings extend to both caffeinated and decaffeinated coffee-or decaf, as Americans often call it. So, the health benefits come not just from
the caffeine in coffee, but from the compounds in the beans.
The large study of about 200,000 subjects included data from three ongoing studies. (21) Subjects in the study had to answer questions about their coffee drinking habits every four years over a 30-year period. Researchers found that moderate coffee drinking was linked with a reduced risk of death from many diseases. These diseases include diabetes,neurological diseases such as Parkinson's and suicide. However, the researchers found no link between coffee drinking and cancer. Researchers also considered other habits such as smoking, obesity, and how active the subjects were. They also looked at what kinds of. food the subjects ate, as well as how much alcohol and what type of alcohol they drank. They.published their findings in the journal Circulation. This Harvard research adds to a growing body of evidence. This body of evidence finds that drinking a moderate amount of coffee may have many health benefits, including a longer life. This is according to one of the researchers involved in the study, Frank Hu, a senior author of the study. Hu adds that data from the study support the 2015 Dietary Guidelines Advisory Report, which found that drinking a moderate amount of coffee can be part of a healthy diet. But how much and when you drink coffee is important.Drinking coffee too late in the evening can disrupt your sleep.
Not everyone feels the recent Harvard study confirms anything. (22） The news organization NPR spoke with one expert who warns that not everyone reacts to coffee in the same way. It is not sure how coffee is linked to certain health benefits. In other words, the important thing to learn is that if you like coffee, do not feel guilty about drinking it in moderation. If you don't like coffee, don't feel you have to start drinking it to be healthy.
 What's the good news for all coffee drinkers around the world?