Over watering yourself.

You CAN overhydrate. This tends to happen most frequently to people that run marathons or do large amounts of cardio. It has something to do with your electrolyte balance and a person's sodium levels. I believe that salt and sugar are recommended to keep things in check. (I am by no means an expert, I've just done a lot of hiking and I know it was a concern that while one needs a LOT of water while hiking at high altitudes, we had to make sure we didn't over do it.) I think that is why athletes drink things like Gatorade...

I researched this before, and from what I read yes it is possible, but it is usually not a problem for the average person. This is something that happens to people using certain illegal drugs that affect their mind in a way that causes them to feel thirsty when they are not. They can end up over-drinking and "drowning" from the inside-out. Unless you're on some freaky drugs, you should be fine. Your body will let you know if you even approach this limit, because you would feel ill. :drinker: Wish I had this problem! I struggle to drink all my water, especially when I'm at work and have to use the public washroom:grumble: lol