I am a coffee roaster, by way of a trade. So, 'drinking' coffee is a part of my work. I was able to go from 320-270 last year on a 30 day with making NO changes to my coffee consumption. That being said "I" am probably geared more towards caffeine consumption than most people.
After year of returning to 'normal' eating and simply replacing my work meals with juices (SOOO much easier to plan for and time management) I went from 270 to just about 275ish. I am about a week into another 30 day with a 240 goal. I agree, moderation. I drink quite a bit, or 'taste' quite a bit daily.
I just wanted to chime in against the hardline so many have had about coffee, of course that is BLACK, no cream, no sugar