It's not really as hard to get fiber in your diet as people
think. The thing to do is simply eliminate processed carbohydrates from your diet – white bread, white rice, potatoes, pasta, most cereals – and replace them with high fiber alternatives – whole grain pasta, whole grain bread, whole grain cereal, brown rice, etc. Prunes have the most fiber of any food. Oatmeal is an excellent breakfast food.
You shouldn't eat any junk food. What are you doing the treatment for if not for your health?