Off plans food happen just move forward from there. Don't wait until the next day or week to get back on plan do it right away. I couldn,t have gotten threw this diet if I didn,t follow my own rule of, if its not a low carb day then it has to be a low calorie day. That keeps me from saying oh heck I already had one bight of that cake I might as well eat the whole thing and follow it up with chocolate milk. One bight doesn,t have to kill or even slow down your progress but it certainly will make it harder because hello cravings.