In Reply To:
I've read some studies that show sodium is not the most effect electrolyte when it comes to intake. Your body is very good at regulating sodium compared to other essential electrolytes. There is also reasoning that you should only try minimal repletion of electrolytes when the losses are high.
Sure, that makes sense. But by minimal, do you mean minimal intake, or minimal compared to what you lose (percentage-wise)? Certainly when you are out in the sun for a long day you aren't going to be able to take in all that you lose (electrolytes, water, calories), but it seems to me that some needs to be taken.
-C
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Any run that doesn't include pooping in someone's front yard is a win.