I love coffee. But I no longer drink caffeinated coffee daily due to negative effects on my body. Now, different bodies are...different. So not everyone may be affected this way, but this is what caffeine does to me:
-- When I drink coffee, even when it's only in the morning and just one cup, I sleep much more poorly; it takes me longer to fall asleep, it's harder to stay asleep. For general health, and for weight loss specifically, this is a bad thing.
-- When I drink coffee, my insulin resistance comes back. I can tell that this happens because my complexion suddenly goes from rosy-fresh and peachy-smooth to riddled with acne. Insulin resistance is, of course, very bad for general health and for weight loss specifically. So I avoid drinking coffee regularly because I don't need to be doing ANYTHING that will raise my resistance to the action of insulin.
Coffee does have lots of proven good effects, too; it's helpful for constipation (honestly I was much more regular when I was a regular drinker); it does boost the metabolism slightly and may suppress hunger; coffee contains antioxidants and other good stuff (however you can get antioxidants from tea, too). And best of all, it FEELS GOOD
My ritual with coffee now is that I have one big mug of caffeinated coffee in a homemade mocha on Saturday mornings, before setting in to doing housework. It really gets me going, and I love that feeling. But every other day of the week, I say no to caffeine (except for the small quantities in the tea I drink).
As with so many things, I believe you've got to figure out for yourself where coffee fits in your life. There are tradeoffs.
P.S. It was actually harder for me to quit coffee than it was to quit sugar :/ I don't get withdrawal symptoms, but I love that rush of the caffeine just SOOOOOOO much.