I would suggest, if you do a juice fast to use a really high end blender. I have a Blendtech and it works great. If you use a juicer it will strain out all the beneficial fiber and what not. I think it could be very beneficial for maybe a week or two as long as you keep the sugar down and it is crucial that you get enough fat and protein. Try to give yourself adequate macronutrients. This will keep you nourished while making it much easy for you to digest and absorb the food.