There are nutritional issues and there are diabetes issues. From a nutritional standpoint eating Frosted Flakes every day is probably not the best idea, but eating them once in awhile as a special treat is OK. Just look at your recommended amount of carbs at breakfast and then pour accordingly, but don't forget to count the milk! If your BS still becomes elevated even after counting carbs, an extra unit of fast-acting (Humalog or Regular) might be in order, but consult your doctor or certified diabetes educator before making this type of adjustment.