Ever hear of osmotic balance? It's a term used to describe the tendency of solutions (specifically those in the body) to balance their level of dilution (ratio of solvent to solute; water to nutrients/molecules in the body). When you take in creatine the portion not excreted is stored in your muscle, this decreases the ratio of fluid:molecules in your muscle cells and iinterstitial fluids(stuff around and not inside the muscle cells). Because of this when your blood passses through the veins and arteries in your muscle, water is leeched from it because of the change in osmotic pressure related to the extra creatine there. When the creatine levels drop less water is needed in the muscle to balance osmotic pressure and it is returned to the blood stream and excreted.
Anyway, all that means is that you pissed away a good portion of the water weight you were carrying, hence the change in body weight and clearer muscle tone. A little extra water is not necessarily a big problem and if you want to lose it in the future you already know how to do it.



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