Unless you know how to handle a fast and exactly what kind of fast you would be attempting and for what exact purpose, it's best not to mess with that stuff.Even a lot of holistic people say that the American lifestyle does not lend itself to a proper fast. a lot of people won't even do a spiritual fast unless they are in the Ashram or some properly controled environment.As for cleaning out, that is a whole other ball of wax.Before doing anything you need to discuss your problems and plans with your doctor.To begin any kind of cleaning out process keep it simple and begin with eliminating liquids that contain caffine and color and fizzle.When you get it down to drinking water for your main beverage then you would be ready to begin to eliminate other things from your diet.I always say begin with the elimination of unnecessary beverages because most people have a really rough time letting go of the huge amount of beverages they drink that are not water.You are just going to exchange a regular beverage serving for water.When this process happens the body has to adjust.If you find this part of the cleansing process difficult then you know for sure that a fast would be the worst thing for your system.Remember, you aren't cutting out liquid intake. You would be cutting out all non essential non nutriative beverages in exchange for water.So go from there. and then seek out a good nutritionist to help you plan a good cleansing shedule.Kamie