Did you start off with gusto, a plan and dream to become a new you? Like the majority, you probably said yes but I wonder how it's going to be in about two weeks. Life's little stresses may set in, things may not go as planned and your old habits will start to creep back into your life.
When all this happens I want you to breath, take moment and write out your plan. You see it's not about having a plan B, it's about not giving up when things get a little hectic. Try again and again, don't be afraid to start over I promise you won't look like a fool. To me a fool is someone who quits at the first sign of defeat.