I would also imagine so much liquid dilutes the stomach juices and the food doesn't digest properly. I don't have any scientific basis for this btw, just a hunc

I would also imagine so much liquid dilutes the stomach juices and the food doesn't digest properly. I don't have any scientific basis for this btw, just a hunch. I've never heard of that happening, or anything like it. There is such a thing, supposedly, as water intoxication though: http://en.wikipedia.org/wiki/Water_intoxication http://en.wikipedia.org/wiki/Water_intoxication It's not a serious concern for anyone not running marathon distances or taking part in a water-drinking competition, though.