Think about how you'll feel if you do go and wolf down something to slake your hunger. Yes, the hunger will be gone, but will what replaces it be an improvement? You've invested a great deal of effort in getting to this point of your diet, and at this very moment it's all on the line. All the monitoring, all the calculation, all the analysis of the trend and the carefully crafted feedback systems are for nought if you ignore the meal plan whenever it proves uncomfortable. Weigh the immediate surcease of hunger with the feeling of accomplishment you'll have after the next regular meal in knowing you weathered a difficult time and emerged still on course.