Fasting is supposed to be good for everything, if done right. I once fasted 7 days. I´ve read that after 3 days the hunger feeling should disappear, but in my case it didn´t, I was terribly tortured by hunger the whole week. I wanted to fast more but had to give it up because due to hunger I couldn´t concentrate on anything. But one woman I know said she fasted about a month and had no hunger at all.
If someone of you decides to try, I would like to know how it goes, let me know.
One thing I forgot to say, when I was having a surgery I was about 16 days on parenteral nutrition, I didn´t even drink during this time. In the end due to this not only my body complaints were healed like never (until it got messed up again gradually), I was also incredibly calm, not a bundle of nerves like usualy. When I compare the peace I felt with how I am now, it makes me think I am in some half poisoned state (and if I started to take medicines it would make the body polution worse).