Day 2, and so far all is well. This time around, I actually eased off solids two days in advance, so my body was already used to not digesting solids in preparation for the fast. Very very mild, faint headaches, but they usually go away in a few hours, with water. Looking forward to feeling great at the end of thsi 21day cleanse. I'll probably only get on the scale weekly - every Sunday morning - since I started on Jan. 1st which was a sunday. Good luck to all!!