One of the easiest ways to not eat junk food is to not buy it. Are you interested in eating more fruits and vegetables? Buy them! Have them on hand and available. Interested in cutting out sugary snacks or processed foods? Stop buying them! Don’t have them within arm’s reach. You can’t choose something that is not there.
Today make two lists. One of foods you would like to buy more of and one you would like to buy less of. Write them out.