peachy gave GREAT advice, as did the others.
IF you are interested in fasting, you might want to follow MH (Barefood Herbalist)'s orange juice fast. He has a free e-book that can be sent to you, it is simple, apparently easy to do (and easier than water only fasting), and very effective. If you go to the Ask Barefoot Herbalist Forum , jcounts can e-mail you the free e-book.