It's commonly accepted fact that coffee is a diuretic. If you drink it, you will end up less hydrated than before. Chalk this up as a myth. Unless you're drinking over five cups a day does it become true. Since most of us will not drink that many ventis a day, we're not at risk. That means you can count your morning cup of coffee as part of your daily hydration needs.
I know that some of you are thinking about how drinking your morning coffee makes you sprint for the bathroom. That is true, it does speed things up, but it doesn't create more waste than was consumed. That is the same as drinking a glass of water.
Coffee also has benefits that water alone doesn't. The caffeine may improve brain function, prevent cancer and improve your workout. It may also help prevent heart issues, parkinson's, and diabetes.
It's not going to solve all of your health problems, or overcome any bad habits you have. That does not mean it's not good for you. If you enjoy a regular cup of coffee, don't worry about it. Drink up.