Mind Your Body (July 16, 2008) carried an interview with Dr Benedict Tan of Changi General Hospital. One myth he debunked is about drinking during exercise. The danger is over drinking - which can lead to low sodium levels and hyponatraemia, and is potentially more dangerous than dehydration as it could lead to coma.
Reflecting back to my past marathon experiences, this reinforces my suspicion that I over drank as I felt bloated and somewhat uncomfortable toward the end. So it will be half a cup at each drink station instead of a full cup after 15 km. I will keep to one full cup during the first 15 km as that would be when I lose the most to perspiration.
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