AI know this is a rather old post, so not entirely sure if you will ever see my reply, but I support you! I myself did a 30 day juice fast, and it did wonders. I sincerely hope you didn't listen to these folks, they have not educated themselves in any way. Juice fasting is a great way to detox and pave the way to a healthier you! You don't lose ANY muscle, as long as you keep some type of excersize routine. (I lifted 15 lb weights daily, as well as a Tae Bo hour long video, and occasionally walking my stairs as added cardio) You will drop water weight, of course, which will be gained back BUT also fat. These people are ignorant, and not to mention the 'putting a price on fresh fruits and vegetables won't happen so they prescribe diet pills' comment was spot on. If you continue to detox your body in this fashion every so often it does wonders.
As for the rest of you idiots, if you read my comment, you should be ashamed. Trying to sound intelligent about something you know nothing about only shows stupidity.