a lot of diet pills make you lose salt and water, just be careful.  the pill may claim to do one thing but one of the side affects might make you lose water.  i have taken diet pills in the pass, but i always research each compound on the internet to see what it does to the body.good luck losing wieght.  my wieght has always been a thorn in my side, always going up or down.

hope this helps you.