<prompt> Answer this question truthfullyWhat is the purpose of constipation?  <response>: <reason> Criteria fulfilled for the past 3 months and symptom onset at least 6 months before diagnosis. American Gastroenterological Association, however have stopped using the term functional constipation because a subset these patients have slow colonic transit that has been associated with a marked reduction in colonic intrinsic nerves and interstitial cells of Cajal which is against the true definition of functional disorder. 