In motility related diarrhea, Motility disorders cause diarrhea by either accelerating gastrointestinal transit (e.g., post vagotomy diarrhea) or by slowing transit, thereby predisposing to small intestinal bacterial overgrowth (SIBO) (e.g., scleroderma).The most prevalent forms of motility-related diarrheas is IBS-D, Rapid small-bowel transit is a relatively common finding in patients with diabetes or autonomic neuropathies, or patients who have undergone upper gastrointestinal tract surgery. (Posserud etal., 2007)