I've known guys that drink it before they work out. Ugh. Myself, I only drink coffee in times of extreme needs, finals week, big test in school. And it has a negative effect because when I drink coffee it is 6 cups at a time. But also at the same time I am not sleeping properly, diet sucks, workouts suck. Just did this past two weeks. Had 120 pages of papers to write, 65 minutes of presentations to give. Graduate in 8 days. It's worth it to finish school but does my body no good.
I think drinking coffee in moderation would be no worse than most other things. Except when concerning creatine. Seeing creatine is used to put water in muscles and caffiene sucks the body dry, whats the word, diaretic