Fasting is a really interesting idea that I have never really considered before reading this post. Although I am not religious, it seems like it would have a lot of spiritual benefits in addition to the health ones. I might have to give it a try.
However, I totally agree with Jim that we need to check our sources and make sure we're reading scientifically sound stuff. I did a quick search and read over this article which in turn sites other sources.
The Health Benefits of Fasting
Its tricky when you get away from mainstream science because there is usually much less quality research available. At the same time, we all have seen so many times that mainstream "science" has just been a form of advertising for corporate interests, particularly in the realm of one's health. I was just thinking today about how totally dependent we are on authorities, especially when it comes to our health. At least most of us have moved beyond leeches and other harmful remedies.