Eating before your run is pretty much a personal choice. I rarely eat before a run, even before a marathon. And then I have to eat several hours before to avoid stomach upset during the race. The fuel for your average training run comes from stored fat and glycogen (carbs). Typically you have enough fuel for something approaching 20 miles. What you eat shortly before a workout generally won't be digested and make its way to the muscles in time to be of much help on shorter runs. It may be of some help on longer runs though.
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