Prevent Diabetes is by maintaining correct weight. check for the early symptoms of diabetes. Here is one study, Drinking tea or coffee reduces the risk of diabetes, according to a review of 18 studies that covered hundreds of thousands of people. Previous research had shown that people who drank the most coffee were one-third less likely to develop diabetes than those who drank the least. In the years since then, the amount of research on coffee and diabetes risk has more than doubled, and other studies have suggested that tea and decaffeinated coffee may also be effective in preventing diabetes." Now you decide what you do.