I completely agree with this and would like to add that you don't have to include the B in the P&B shakes right away. Sometimes it is beneficial to just start out with the P until things really get moving. The B can be a little constipating, and the P can really do a lot of work on it's own. Just a suggestion that might help someone out there.
This is taken from the stages of fastings in the FAQ&A:
"Stage 5 (Breaking the Fast)
The sticky, toxic, mucoid coating on the intestinal wall is loose, and the first meal frees it from the intestinal wall. Toxins enter the blood through the colon. The gallbladder dumps its waste in a heavy discharge of bile. This can cause an instant bowel movement upon eating followed by intense diarrhea. If the symptoms are too uncomfortable, an enema will help"
The P&B shakes just help to push the plaque through. It is my understanding that they don't stimulate digestion in any way.