In your fast, did you have cleansing symptoms, like diarrhea, etc.?
There's nothing wrong with having some fruit now and then, and apples are great for breaking a fast, but if you want to learn about fiber, you have to dig deeper than the usual vegetarian hype. For example: http://www.fibermenace.com/fibermenace/about_fm.html
The author has cured himself of ulcerative colitis, which is the last stage before colon cancer.
While fiber stimulates the intestines mechanically, it eventually causes constipation and other major digestive issues, as it damages the bacterial flora which is really responsible for the health of the gut.