So glad to hear that fasting is changing the state of your mind and that junk is repulsive to you. I have been there a long time ago and know how great it feels.
Being part of this world full of junk foods all around us, becomes harder to resist it and avoid it. People offer cookies and cakes to us everyday, shops display junk foods aisle by aisle, so when you break your fast and reset, everytime you encounter these foods, you will have to say to yourself, this is plastic, not good for me. It will become a habit and then you will pass on the self learned knowledge to others.