Ok, you fell off the band wagon. Now get up, dust yourself off and vow that tomorrow is a new day. You have got to remember that this is your new WAY OF LIFE and NEW WAY OF EATING. You can only take this one day at a time.
Are you using FITDAY.COM? If not, start. This is a good focusing tool. Remember you are only cheating on yourself, no one else.
I constantly tell myself that I'm a carboholic and that food item is poison to me. Why would I want to put that poison into me? Then I can sit there at the table and watch other devour the corn chips and salsa, or eat the chocolate cake with ice cream. It's poison to me.