Dewd, my question would not be why, so much as HOW can you drink so much at once! Are you not drinking anything during your intermittent fasting time? I thought people were allowed to drink stuff as long as it didnt break the fast. Like coffee but no cream or real sugar.

Also, my body has never been fooled by water. When i want food, i want food!

And i would be careful of water intoxication, which is drinking too much water too fast.