G.D.
I saw on the Doctors tv show this morning that the colon cleanse or system cleansing stuff wasn't all that beneficial. The doc said that it might be a good kick off to get you started on your journey, but of course, the best way to proceed was a moderate diet, exercise, etc. Actually, fasting a day or so - if you can do it physically and medically - is a good kick start, too.
I have a friend who sells MonaVie and swears by it. V-8 makes a Acai berry blend veggy/fruit juice and I've been drinking a little bit of it for nutritional purposes, but haven't noticed that it's helping with my weight. Problem with MonaVie that I see is that you only take an ounce or two a day, but a bottle is quite expensive and only lasts a few weeks.
Good luck!