Interestingly enough, it does just the opposite. It actually flushes that out. Trust me, when I push the water to the recommended 6-8 a day, I lose better. Like last night I had more sodium than usual and was up 0.5 today (knew that would be the case when I got up and my fingers were a little puffy), but I pushed the water today and I know that it will be back down tomorrow. Think of it this way, the human body is 60-70% water, so, when we stay well hydrated, our body can function better, so we can feel better. If I go for a few days and don't drink enough water, I begin to feel draggy. Give it a try! I put some SF powdered drink mix in it sometimes just to spice it up.