The poster who suggested salt intake may be right on. There is a sport's doc on Runner's World who says that if you are exercising hard enough to really sweat, that you need extra salt. As a matter of fact, right before I run a race I eat one of those salt packets that you get from a fast food restaurant. If I run a half marathon, I take another one during the race. You can run into all sorts of problems if your sodium level is too low. Maybe try what the other poster said with eating a salty snack, such as pretzels and see if it helps.
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