I think if more people read the last paragraph of this article and then fasted based on what it says in that paragraph then there would be fewer people getting sick. At work, there was a group of ladies who decided to go on a fast with fasting juices. They thought that by doing it together they stood a better chance of sticking to the diet.
Some of the women made adjustments in their diets leading up to the fast as is suggested in this article. On the other hand, some women ate as usual right up until the day of the fast, and then they went cold turkey--no solid food whatsoever. As you can imagine, these were the women who suffered the most and they were the ones who did not fast for the entire period they had planned to.