i don't know too much about the details, but i think that if the bowels get accustomed to functioning with a certain ammount of oxygen to get things moving, in the long term i think it may become dependent on that same level ammount of oxygen.Also, if the bowels no longer needed to contract in order to have a bowel movement, would'nt it the muscles just get lazy in time?..just my thoughts..stuff works like a dream..sometimes i feel like i can eat whatever i want because i can just flush it out the next day!!!
(: