I heard you have been having some trouble with eating too much fast food. I suggest that you try eating something healthier. You can start out small, like eating a fruit a day or having a salad once or twice a week. This will mix up your diet so that you don't crave for only fast food.
If you really want to stop eating fast food (until you can control the amount you can eat), think of it as wasting money on "bad" food (Obviously it isn't all bad, but thinking that it is in this sense will make you not want to get the fast food).
