A cup of hot water with a slice of lemon in it, sipped first thing in the morning before eating anything else can certainly get the pipes lubricated.
And if you're eating that much fiber, be sure that your water intake is up to 10 -12 8 oz glasses a day! Think of fiber as a broom that sweeps clean the walls of the intestins.(sp) But, a broom also needs lots of water to really clean out that dirt from the corners.