i duno man but you probably overhydrated yourself.. in other words you fuckin started drowning yourself which is horrible for you in the first place but seeing as how ur that light you should have some kind of crazy fast metabolism, im 5'10" 155 lbs, 5% body fat, so i duno whats up man i guess it depends on how much you had smoked beforehand (regular, light user) also the water will just dilute your pee in a few days time, if all ur using is water its going to take a lot longer to get all the THC out and piss clean. But if it makes you feel better i eat a shit load all the time too, work out 5 days a week and never seem to a gain a pound either, extremely frustrating so who fuckin knows.. hope i was atleast a little bit of help.:jointsmile: