Deprive

Is it good to deprive yourself of things? How do we know when things are bad for us? I've been trying to figure that out recently. Now there are things that we know are bad for us, things we shouldn't touch. Most of the time its stuff we want or like. But how do you know when something is bad for you? I deprive myself of things that I think are bad for me, it works for a bit, until somehow I decide It's worked its way out. I don't know if that's a way to live. But we'll see.