hey all, i lost quite a bit in 1 month. then, for the past 3 weeks i haven't lost anything. i've been eating a bit worse than before, maybe 2500 calories at most. but still running everyday for 45 mintues. it says i burn about 400 cals each work out session. but like i said, i've been at the same weight for 3 weeks! help please what should i change?