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By pushing too far beyond your current capabilities you can cause your body some
serious damage. When you have run too far or too fast and have shifted to glycogen
as a fuel source you're on unstable ground in the long race. Glycogen is the only
fuel used by the brain and the supply of this energy source is greatly limited.
At critically low levels of glycogen, your body's survival defenses take over and
reserve what's left for the brain. When the brain senses a low supply, it protects
itself by making it difficult for you to concentrate on finishing the long event--or
even telling you to quit. These are warning signs that put you on alert.
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