First, answer this question "How does the food which is not good during the whole tenure of lifestyle modification will become good on cheat day? We do not bargain these things as we are intended to give a desirable result.  Cheat day is not allowed during the diet plan period, but in some unavoidable situations, when you are not at home or in the city or you are sick, you may select healthy options available. Avoid sweets and fried foods even in unavoidable situations.