I know that if you have a high fiber diet, you should be drinking lots of water. As to the muffin “moving things along” I’m not sure. Personally I believe moderation and variety are the way to go. It helps achieve a balanced diet, and you don’t get tired of the same foods and quit.
P.S. I like the triple poop post...
Something about high-fiber, low-carb diets just don't agree with me.