Runners know what an important role the diet plays in fueling the run. For me, it really is the pasta dinner the night before. You kind of have to experiment with a few things to find out what works for your body. And we all know how rough finding out what the no-no's are! That can mess up a really good run! (lol- runners know what I am talking about!) But I don't think that what we eat is the guts of the matter. What really fuels the run is found when you top that huge hill that was just taken in stride, or you shave a few seconds off a PR, or you get that medal in your age group at a race...all summed up in one word: success. That's really the "stuff" behind why we continue. Think about how discouraging it would be to run at the same pace every single day and never be able to get any faster ever - or if the same hill kicks you in the butt every day and you never conquer it...discouraging to say the least. I think this is true in many aspects of our live...