From Fellrnr.com, Running tips
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Carbohydrates (carbs) are a key energy source for runners. The way carbs are used depends on the state you are in. If you are in the middle of exercise, these carbs tend to be used directly for energy. If you are at recovering from exercise, these carbs will go into quick access storage (glycogen). If your glycogen stores are full, then the carbs will tend to be stored as fat.
Swapping high GI foods for low GI foods can be a very useful part of a weight loss program. A given number of calories of a high GI food will not keep us satiated as long as low GI. That means that eating a low GI food will stave off hunger for longer, causing us to eat less overall.