How can I stop craving sugar? (see details).

Recently, I got badly constipated and the doctor said I would have to take Gentle lax (Miralax but by Kroger). I also had to go on the B.R.A.T diet. In case you don’t know it stands for: bananas, apple sauce, ,rice, and toast. I can have a little more though. Just not meat, a lot of dairy, and sugar. Just then my grandparents had gotten brownie bites. I just don’t know how to stop craving sugar.