One bad day isnt the end of the world. Just remember your goal and get back on track tomorrow. If you are not in ketosis tomorrow do induction for 5 days or so to get u back into ketosis and then go back to where you left off. I have yo yoed since january and am about 11.5 lb loss. I know I have to say goodbye to the sugar that is making me fat and trade that stuff in for things that are acceptable and this is a great place to get ideas on what to eat. I think we have to just decide this is very important and not ever feel the same way we used to about what we are eating.