I still use refined sugar for coffee and other things.
I understand refined sugar increases fat on the body.
So, how can I replace refined sugar?
You don't replace sugar, you reduce it and start appreciating the taste of unsweetened real food, like dark chocolate and black coffee. I found that it helps to go on an elimination diet first to break the craving cycle. After a few weeks you stop craving it and you can break the addiction.
Stevia can be a good replacement if you have to, but I agree with Stu about eliminating it. You will find it doesn't even appeal to you after a while. If you do get Stevia, make sure it isn't bulked out with Maltodextrin or anything. I have some pure Stevia drops at home, I forgot the brand (don't use it as I don't have a sweet tooth but partner does!).