Fiber for Gallbladder Sludge. Fiber for gallbladder sludge is almost essential. When you're working on eliminating the sludge it's always a coordinated effort of liquefying bile, increasing bile flow through the gallbladder to flush the sludge out, and fiber to grab the toxins from the sludge and pull them out of the body so you don't end up having to detoxify them back through the ....