I often wonder why there is not a sliding scale ordered for "extra" snacks for those that eat such carb laden treats on there own. If they are going down to a snack bar and getting pretty much the same thing each time --couldn't an injection be taken to cover the number of carbs they injest -you are charting anyway --count the carbs and use a sliding scale. Also to consider -some doctors tend to overdose insulin --over the guidelines for the weight of the patient and they may very well be overdosed. Their bodies could be craving for the sugar they may need --and then overdosing themselves from a low ---or their body is rebounding on its own from the excretion of glucagon from the liver. You have to see how far up the blood glucose goes after their "binge" to see if they need an injection or if they are simply doing what their body is telling them. In the case of the latter- reduction of insulin is needed. Remember 1 unit of insulin per half kilo of weight per day is the guideline. Check to see how much insulin your patient is taking per day -. As people age they need less insulin and the elderly even more so .I have a 90 + patient that now takes a tenth of what she took ten years ago -plus the insulin takes a few hours longer to be effective -even Humolog.