I'm not a fanatic about it, but I figure it can't hurt. I asked my Dr about it and she said its a good thing. I wouldn't do it more than twice a year, though, and I wouldn't do it all the time...
There are supplements that you can buy to maintain the balance of your digestive tract. Here is a link to the products I use. I use the Transformation products that I buy at a local store. The owner of the store is actually a Pharmasist trained in Western medicine but prefers holistic natural remedies. He's FABULOUS and facinating to talk to. This is what he suggests.
http://www.enzymeessentials.com/HTML/order_enzymes.html
With these products I actually feel the results. I get my rest and feel more energetic when I take them.