On the days you run, I have always been told to abide by the 40/40/20 rule. 40% Carbs, 40% Protein, and 20% Fats. Every article I've ever read on running says to ensure your carbs are coming from complex sources. Now, most experts say that up to 10% of your carbs can be simple carbohydrates like sugar and candy bars. Do you crave post-workout, at night or early in the morning?
I would say to eat an apple when you get the cravings. That will sate the sweet craving and also provide you with a "crunchy" snack which is often craved as well.