This one is for when you have decided that you are going to allow yourself some indulgence but do not want to overdo it and know that it is likely that you will because your willpower and self-control might give.
Make yourself eat the healthy food first, eat slowly, and drink lots of water. Give your body time to fill up on the good stuff before you reach for the desserts and chips, that way it will be physically uncomfortable for you to overdo it. This is a good plan for when your willpower gives. Your body will give you an unpleasant reminder that you are full and that you should stop eating! And the good part is that you are full of healthy food and that you still allowed yourself to have a little somethin’-somethin’ on the sweet side.