Experiment with pre-run foods and fluids to see what you tolerate best. During Run Whether you need fuel during your run depends on how long you are running and at what intensity. The longer and faster you run, the more fuel you are going to need. And your pre-run foods may not be enough to carry you through a high quality workout. Generally, for runs of at least 1.5 to 2 hours, you will require extra fuel.
Most people choose energy bars, gels or sports drinks.
However, you may choose any food that is high in carbohydrates and low in fat. It is crucial to try different foods on your long runs to see which ones you tolerate best. Fluids are crucial during runs longer than 1 hour. Carry a bottle belt or plan several water stops along your route. Or take money with you on your run and plan to stop off at a convenience store for a drink.