Too much fluid intake during a marathon may not be good as it may lead to hyponatremia. 1 and 2 are some simple definitions of this condition. Read this article for more details. As a runner, I always want to reach the finish line. So if you are interested in summary of the article (it’s a long article), just go to the end of the article.
USA Track & Field (national governing body for track and field, long-distance running and race walking in the United States) hydration guidelines also recommend (on the similar lines) to be "guided by your thirst" instead of "stay ahead of your thirst". Another useful article on this condition.
Technorati:
topic:{technorati}[Running] topic:{technorati}[Marathon] topic:{technorati}[Training] topic:{technorati}[track field]
