There are plenty of reasons people say that you should not drink coffee at all. It is addictive. It can increase anxiety and stress hormones. It creates an artificial high that leads into a crash. It stains our teeth. It can negatively affect blood sugar levels.
Knowing all of that, I still love my joe. It does have antioxidants. It can increase alertness and metabolism, perhaps only short term, but it works. It can help headaches and dilates airways. Maybe that is why it is found in medications. There are studies that found that it may help to prevent some illnesses, such as cancer and type II diabetes. As I described in a previous post, I am usually tired. Even with coffee, I sometimes have to use tools that I learned playing sports to jazz myself up to be productive. Instead doing sprints at the end of practice, I am finishing up paperwork.