Fasting in Post Diagnosis, Recovery & Treatment of Celiac Disease Posted March 17, 2007 · Report to Admin You might want to try a modified elimination diet where you avoid most foods for a week but still get enough nutrients through the foods you do eat, then you start to introduce foods one at a time (much less traumatic than an extended fast). This worked really well for me. I fasted for a week last month (only ice chips), but I was in the hospital on bowel rest for paralytic ilius. I was on constant iv potassium chloride and about 15 different medications. I would not recommend fasting without a doctor's supervision if you've never done it before.