About Nine months ago I did a 3 day water fast. I ate my last meal on a Thursday afternoon so that day 2-3 would fall on a weekend when I would not be working (less stress & strain). I felt good the first two days, the last day was the hardest. I wasn't physically hungry but I couldn't get my mind off of food. Eating is very enjoyable/psychological/addictive for me. I physically felt poorly the last day and I think this might have been attributabe to the "Healing Crisis". In hind sight, I wish I would have gone past the three days to see if I could have gotten past the healing crisis. The whole experience was very positive for me. I enjoyed the sense of accomplishment. I think there are many benefits to a water fast.
I did a lot of research online before I started and here is a story (albeit a very long story), that I found very fascinating and inspiring.
Triumph Over Disease ( ulcerative colitis ) by Fasting