What if you are drinking lots of water and not going to the bathroom more?

Answer 1

So you're fasting. Not a danger in the short run if you're otherwise healthy, but not much of a weight loss help either. The lack of nutrients winn shut your metabolism right down, so whatever weight you've lost will go right back on as soon as you start eating again.

Answer 2

First of all, it would be unhealthy to drink too much water at once and usually it means that your sodium level is low.