For me a difficult day is one when the little evil thought that I could go for a little something (e.g.: yesterday-nachos) goes through my defenses, and sounds feasible. In all normal days is just soup-soup-soup and all other foods are absolutely out of the question. In a bad day I get images in my head of me eating whatever I am craving at, than I find myself planning to buy a pack or whatever, or to go to the fridge.. And than I am miserable for the rest of that day. I got these bad days every 4-5 days in the first 3 weeks, and after that I feel like there is one every other day. However, still holding on.