Re: Pre-workout energy source????
Perhaps the need to "fuel runs" is a habit. Perhaps some feel it hard to get going without eating something first. Apart from this I can't understand that there is a physiological need.
I have got into a different groove. I have never eaten anything before running and the thought of downing any kind of carbs before a run never arises. Quite the opposite. If I am having a day off, I feel hungry when I get up and will eat as early as I can. If I am running (usually 1 - 2 hours) I don't feel hungry and will eat at 8:30 or so, when I return.
On a long run, over two hours, I might feel hungry for a while, particulary if I am running slowly. Well, the easier I run the more likely it is I will feel hungry.
I can imagine that it is possible to get into the habit of eating first, and not feeling comfortable without some carbs in the stomach. However, I can't see any direct benefit to performance.
Surely it is better to do without if you can? It keeps things simpler.