Coffee contains antioxidants and magnesium which can help improve your body's response to insulin. Studies show that drinking 6 cups a day may reduce the risk of getting diabetes by 30%. But drink that black, leave out the cream and sugar. Six cups is a lot, so drink decaffinated. Don't want six cups (that's cups, not mugs!), even a moderate amount should be helpful. So if you are at risk for diabetes, have a cup of Joe.