im not sure why he/she lost that much weight by drinking water but i think its cos the water filled up his/her stomach so they wasnt hungry and didnt want 2 eat anything cos they was full up on water...wonder if it made them wet the bed :o\ lol any ways, if u wana lose weight fast, then try the atkins diet! it works, my dads been on it for about 2months now n hes lost nearly 3stone!! but please stop doing it if u get side affects x