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Is coffee bad for you?

Just the opposite. Numerous studies have shown that coffee is associated with impressive health perks. It's been linked to lower risk of heart disease, Parkinson's, and liver cancer—and it might even help you live longer. In fact, a recent study in the American Journal of Epidemiology found that people who drank coffee had a lower risk of death over the course of 11 years compared with those who skipped joe altogether.

Reality check: Some people believe that drinking coffee before working out will leave you dehydrated. In actuality, one study found that java's diuretic effects don't exist with exercise.