Originally Posted by big john

There have been a number of deaths at the L.A. Marathon attributed to hyponatremia. These have typically been people who are relatively untrained and had spent upwards of 5 hours on course, likely guzzling water and nothing else.

I've felt that as long as I continue to eat as well as drink lots of water I should be protected and I am more likely to dehydrate than over-water. I've suffered terrible nausea on a few hot climbing rides and hope to not repeat that.