Coffee actually has been shown to reduce liver cancer and to be effective with (or with symptoms of) Alzheimer's and Parkinson's diseases," Dr. Oz says. "So there are a bunch of different places where coffee can play a role. The reason it got a bad name is because it does have side effects, for example, migraine headaches and heart palpitations. But if you're not having them, coffee is reasonable."
Did we mention, it's good for those bowel movements, too? Dr. Oz suggests 24 ounces of coffee a day is a rational amount.