Begin recording every nibble you take in immediately on a daily basis in journal.
Why : Because chances are that you, like most of us, don't really know how much you are consuming on a daily basis. Each day, look at the habits you seem to have developed according to the records you are keeping, and make one positive change. For example, consider cutting out one glass of soda, omitting one indulgence, etc
Result : After a week or so , when you have performed this task, go back to your journal and analyze, what you have been eating right and what you have been eating wrong.This will help you to focus more on the good and healthy food.
Note : Dont stop jolting down every nibble you take and see for yourself, if you are making any progress of shifting your focus from junk food to healthy food.