Think of the word junk. Think of all the things you associate with the word junk. Picture a junk yard full of old rusty cars, old parts that are no longer useful, trash, and objects that are of no value.
There is a reason certain types of food are referred to as "junk food." They have no significant value. You wouldn't go to the dumpster and bring back a bag of trash to dump on your living room floor. When you consume junk food that is what you are doing to your internal enviroment. When you decide to eat healthy you are making a decision to remain clean. Remember the old saying "you are what you eat?" Think about what it means to go to the junk yard. How much do you respect yourself? Your body? Are you telling yourself you are trash? When do you think you will value yourself?