There could be some rejection from within to "doing the right thing." It is important to understand this resistance and to take measures to handle it. For instance, if you feel that eating only rich foods will satisfy you today - try choosing a salad that has rich ingredients. Or, if exercise is not on your program, elect to take a short walk after a meal. As you make these small compromises, you will have given your "evil twin" some feedback, and a heated discussion is likely to ensue!