I've never done the 30 hour famine, but I have done 24 hour fasts (only water) during a flare up (actually it was before I even knew what I had but that doesn't change the status of my colon).
I'm no doctor, but in my own misguided logic, how would not eating cause more problems than eating? For your UC that is, not your acid reflux type problem.
Diagnosed UC 12/2007
Folic Acid 1mg x 1/day ~ On going
Asacol 400mg x 6/day ~ Failed (Allergic)
Prednisone 30mg x 1/day ~ On going recent change 2/26/2008
Sulfasalazine 1g x 3/day ~ 2/26/08