Coffee contains lots of antioxidants (it's the biggest source of antioxidants in an average Western diet!) that help the body fight chemicals called “free radicals.” As a result, coffee drinkers are at a lower risk of diseases such as Parkinson’s Disease, Type II Diabetes, and Heart Disease. Here’s the thing, though: coffee drinkers are also more likely to have unhealthy habits such as smoking cigarettes, drinking alcohol heavily, and eating red meat, so the study shown above has been adjusted to show what could happen if these other factors weren’t in effect.